I think PBKDF2 will remain the default for audits and enterprise where FIPS-140 compliance is an expectation. none of that will help in the type of attack that led to the most recent lastpass breach. Higher KDF iterations can help protect your master password from being brute forced by an attacker. The point of argon2 is to make low entropy master passwords hard to crack. change KDF → get locked out). wasn’t the whole point of logging me out of all my devices to force me to log back in using the new KDF iterations va. Warning: Setting your KDF. End of story. Higher KDF iterations can help protect your master password from being brute forced by an attacker. But they don’t even store the kdf / iterations in the database, so changing it would require another database migration / backend change which I didn’t really feel like taking on considering how low the risk for a send is anyways. The number of KDF iterations is cached in your local vault, so none of this applies unless you are logging in to a Bitwarden client. AbberantSalience (LwS) June 14, 2023, 7:43am 2 I believe the recommended number of iterations is 600,000. No adverse effect at all. Bitwarden Increases KDF iterations to 600k for new accounts and double-encrypts data at rest. It's set to 100100. 0 (5786) on Google Pixel 5 running Android 13. Therefore, a rogue server could send a reply for. The user probably wouldn’t even notice. Shorten8345 February 16, 2023, 7:50pm 24. Argon2 KDF Support. This operation logs the user out of all accounts in any event so it should be relatively low friction to update the KDF iterations simultaneously. Remember FF 2022. I don’t think this replaces an automatic migration or at least global notifications for iterations set below the default, but it is still a good suggestion. json: csp should be "extension page*s*", and add wasm-unsafe-eval so we can load the wasm. We recommend a value of 600,000 or more. I think the . But they don’t even store the kdf / iterations in the database, so changing it would require another database migration / backend change which I didn’t really feel like taking on considering how low the risk for a send is anyways. Ask the Community Password Manager. Not sure if this is already on the @Quexten’s and Bitwarden devs’ list of things to do, but I think it would be very helpful to update the Interactive Cryptography Tool to include an implementation of the new Argon2 KDF Support (including the ability for users to test the settings for iterations, memory, and parallelism parameters). By the way, Sends (which I don’t really use) also have 100K fixed pbkdf2. Unless there is a threat model under which this could actually be used to break any part of the security. Exploring applying this as the minimum KDF to all users. Palant said this flaw meant that the security level of Bitwarden is identical to what LastPass had. Ask the Community. Bitwarden Community Forums Argon2 KDF Support. Then edit Line 481 of the HTML file — change the third argument. With the ambiguity in some of the Bitwarden staff responses, it is difficult to say at this time what is going on. json file (storing the copy in any. Among other. trparky January 24, 2023, 4:12pm 22. 0. ), creating a persistent vault backup requires you to periodically create copies of the data. Bitwarden Increases KDF iterations to 600k for new accounts and double-encrypts data at rest. "The default iteration count used with PBKDF2 is 100,001 iterations on the client (client-side iteration count is configurable from your account settings), and then an additional 100,000 iterations when stored on our servers (for a total of 200,001 iterations by. Aug 17, 2014. Unless there is a threat model under which this could actually be used to break any part of the security. Therefore, a rogue server could send a reply for. Then edit Line 481 of the HTML file — change the third argument. Therefore, a rogue server could send a reply for. The KDF iterations increase the cracking time linearly, so 2,000,000 will take four times as long to crack (on average) than 500,000. Feb 4, 2023. Let's look back at the LastPass data breach. The client has to rely on the server to tell it the correct value, and as long as low settings like 5,000 iterations are supported this issue will remain. If you want to do manual brute-force guesses, go to Bitwarden’s interactive cryptography tool. With the warning of ### WARNING. Export your vault to create a backup. Then edit Line 481 of the HTML file — change the third argument. The KDF iterations increase the cracking time linearly, so 2,000,000 will take four times as long to crack (on average) than 500,000. After being prompted for and using my yubikey, the vault immediately signed out (didn’t get any sort of confirmation). I have created basic scrypt support for Bitwarden. The slowness of the Argon2id algorithm can also be adjusted by increasing the number of iterations required, but Argon2id also provides for other adjustments that can make it. The keyHash value from the Chrome logs matched using that tool with my old password. Code Contributions (Archived) pr-inprogress. Can anybody maybe screenshot (if. Addition info from the team, does this sound like the issue: [Android] When account it set to maximum 2,000,000 PBKDF iterations cannot log on · Issue #2295 · bitwarden/mobile · GitHub I changed my KDF from 100k to 300k, so nowhere near that limit, and I am unable to login to the web vault. Hit the Show Advanced Settings button. Bitwarden Increases KDF iterations to 600k for new accounts and double-encrypts data at rest. After changing that it logged me off everywhere. Bitwarden Community Forums. This operation logs the user out of all accounts in any event so it should be relatively low friction to update the KDF iterations simultaneously. Bitwarden has never crashed, none. By the way, Sends (which I don’t really use) also have 100K fixed pbkdf2. ), creating a persistent vault backup requires you to periodically create copies of the data. I had never heard of increasing only in increments of 50k until this thread. Among other. This operation logs the user out of all accounts in any event so it should be relatively low friction to update the KDF iterations simultaneously. Great additional feature for encrypted exports. So I go to log in and it says my password is incorrect. Bitwarden Increases KDF iterations to 600k for new accounts and double-encrypts data at rest. (The key itself is encrypted with a second key, and that key is password-based. Addition info from the team, does this sound like the issue: [Android] When account it set to maximum 2,000,000 PBKDF iterations cannot log on · Issue #2295 · bitwarden/mobile · GitHub I changed my KDF from 100k to 300k, so nowhere near that limit, and I am unable to login to the web vault. json exports. The KDF iterations increase the cracking time linearly, so 2,000,000 will take four times as long to crack (on average) than 500,000. The hash credential to login to Bitwarden servers is only 1 PBKDF2 iteration from the vault master key. 2. The point of argon2 is to make low entropy master passwords hard to crack. Exploring applying this as the minimum KDF to all users. 1. log file is updated only after a successful login. For scrypt there are audited, and fuzzed libraries such as noble-hashes. I also appreciate the @mgibson and @grb discussion, above. Aug 17, 2014. I don’t think this replaces an. 995×807 77. Expand to provide an encryption and mac key parts. Therefore, a. log file is updated only after a successful login. It's set to 100100. If your keyHash value is from later than June 9, 2021, you will need to save a copy of the HTML code of this webpage. Scroll further down the page till you see Password Iterations. all new threads here are locked, but replies will still function for the time being. If that was so important then it should pop up a warning dialog box when you are making a change. If your keyHash value is from later than June 9, 2021, you will need to save a copy of the HTML code of this webpage. This operation logs the user out of all accounts in any event so it should be relatively low friction to update the KDF iterations simultaneously. We recommend a value of 600,000 or more. If it does not, that means that you have a cryptographically secure random key, which is wrapped using your password. The point of argon2 is to make low entropy master passwords hard to crack. The user probably wouldn’t even notice. By the way, Sends (which I don’t really use) also have 100K fixed pbkdf2. Bitwarden 2023. This operation logs the user out of all accounts in any event so it should be relatively low friction to update the KDF iterations simultaneously. From this users perspective, it takes too long for this one step when KDF iterations is set to 56. Making just one more comment, because your post is alluding to password managers in general, Bitwarden uses a completely different KDF, in their case, PBKDF-HMAC-SHA256, which is only CPU hard, and not memory hard. However, you can still manually increase your own iterations now up to 2M. This operation logs the user out of all accounts in any event so it should be relatively low friction to update the KDF iterations simultaneously. Among other. Okay. But they don’t even store the kdf / iterations in the database, so changing it would require another database migration / backend change which I didn’t really feel like taking on considering how low the risk for a send is anyways. "The default iteration count used with PBKDF2 is 100,001 iterations on the client (client-side iteration count is configurable from your account settings), and then an additional. Yes and it’s the bitwarden extension client that is failing here. Set minimum KDF iteration count to 300. No performance issue once the vault is finally unlocked. Also, check out. I didn’t realize it was available as I had been looking in the extension and desktop apps, not realizing a different option existed in the web vault. Higher KDF iterations can help protect your master password from being brute forced by an attacker. 2 Likes. Among other. On the typescript-based platforms, argon2-browser with WASM is used. e the client now gets something like: ``` { kdfType: 0, kdfIterations: 100000, kdfMemory: 1000, kdfParallelism: 2 } ``` As in the prelogin. If your original password is 50 bits of entropy, each additional bit is (theoretically) double as costly to crack. 0 release, Bitwarden increased the default number of KDF iterations for accounts using the PBKDF2 algorithm to 600,000, in accordance with. The KDF iterations increase the cracking time linearly, so 2,000,000 will take four times as long to crack (on average) than 500,000. For scrypt there are audited, and fuzzed libraries such as noble-hashes. However, what was more sharply criticized was the failure of LastPass to migrate older accounts to their new default, with many older accounts being left at 5,000 iterations and even reports of accounts with the iterations set to as low as 1. This is equivalent to the effect of increasing your master password entropy by 2 bits, because log2(2000000/500000) = log2(4) = 2. Exploring applying this as the minimum KDF to all users. Not sure if this is already on the @Quexten’s and Bitwarden devs’ list of things to do, but I think it would be very helpful to update the Interactive Cryptography Tool to include an implementation of the new Argon2 KDF Support (including the ability for users to test the settings for iterations, memory, and parallelism parameters). On the cli, argon2 bindings are. ”. Memory (m) = . Setting your KDF iterations too high could result in poor performance when logging into (and unlocking) Bitwarden on slower or older devices. Exploring applying this as the minimum KDF to all users. Based on the totality of the evidence available to date (as summarized above), my best guess is that the master password hash stored in the cloud database became corrupted when you changed the KDF iterations. This operation logs the user out of all accounts in any event so it should be relatively low friction to update the KDF iterations simultaneously. Setting your KDF iterations too high could result in poor performance when logging into (and unlocking) Bitwarden on slower or older devices. The user probably wouldn’t even notice. Source: personal experience with a low-end smartphone taking 10-15s to unlock the vault with max KDF iterations count. The password manager service had set the default iterations count to 100,000 for new accounts, but many old accounts. Due to the recent news with LastPass I decided to update the KDF iterations. Existing accounts can manually increase this. If you want to do manual brute-force guesses, go to Bitwarden’s interactive cryptography tool. Argon2 KDF Support. With Bitwarden's default character set, each completely random password adds 5. The user probably wouldn’t even notice. Question about KDF Iterations. I can’t remember if I. The client has to rely on the server to tell it the correct value, and as long as low settings like 5,000 iterations are supported this issue will remain. log file is updated only after a successful login. How about just giving the user the option to pick which one they want to use. Low KDF alert: A new alert will appear in the web app when a user's KDF iterations are lower than. Quexten (Bernd Schoolmann) January 20, 2023, 6:59am 20. Do beware, Bitwarden puts a limit of 10 iteration rounds because in QA testing, it was unlimited, which lead to a tester having a 30 minute unlock time (1k+ iterations at 1GiB memory). I have been ignoring the “Low KDF Iterations” warning since it began appearing on vault unlock precisely due to the concerns raised in this thread. This is equivalent to the effect of increasing your master password entropy by 2 bits, because log2(2000000/500000) = log2(4) = 2. If your keyHash value is from later than June 9, 2021, you will need to save a copy of the HTML code of this webpage. For now only memory is configurable, but in a future pull request me might introduce a kdfOptions object, to expose more configuration options (iterations, parallelism) to the user. With the ambiguity in some of the Bitwarden staff responses, it is difficult to say at this time what is going on. Among other. In the thread that you linked, the issue was that OP was running third-party server software that is not a Bitwarden product, and attempting to use a Bitwarden client app to log in to their self-hosted server that was running incompatible software. I'm curious if anyone has any advice or points of reference when it comes to determining how many iterations is 'good enough' when using PBKDF2 (specifically with SHA-256). When you change the iteration count, you'll be logged out of all clients. Bitwarden uses AES- CBC 256-bit encryption for your Vault data, and PBKDF2 SHA-256 to derive your encryption key. It is recommended to backup your vault before changing your KDF configuration. Went to change my KDF. There's no "fewer iterations if the password is shorter" recommendation. Bitwarden Increases KDF iterations to 600k for new accounts and double-encrypts data at rest. With the warning of ### WARNING. Amongst other weak points in the attack, LastPass was found to have set the iterations to a low count, which is considered an insecure practice. With the warning of ### WARNING. app:browser, cloud-default. 1 was failing on the desktop. Setting your KDF iterations too high could result in poor performance when logging into (and unlocking) Bitwarden on slower or older devices. The team is continuing to explore approaches for. Setting your KDF iterations too high could result in poor performance when logging into (and unlocking) Bitwarden on slower or older devices. The number of default iterations used by Bitwarden was increased in February, 2023. Both the admin web server side and my Bitwarden clients all currently show a KDF iterations value of 100000. But it now also will update the current stored value if the iterations are changed globally. Hit the Show Advanced Settings button. For Bitwarden, you max out at 1024 MB; Iterations t: number of iterations over the memory. Argon2 KDF Support. rs I noticed the default client KDF iterations is 5000:. We recommend a value of 600,000 or more. Ask the Community. If you want to do manual brute-force guesses, go to Bitwarden’s interactive cryptography tool. Search for keyHash and save the value somewhere, in case the . Bitwarden Increases KDF iterations to 600k for new accounts and double-encrypts data at rest. This operation logs the user out of all accounts in any event so it should be relatively low friction to update the KDF iterations simultaneously. Can anybody maybe screenshot (if. Bitwarden has also recently added another KDF option called Argon2id, which defends against GPU-based and side-channel attacks by increasing the memory needed to guess a master password input. Setting your KDF iterations too high could result in poor performance when logging into (and unlocking) Bitwarden on slower or older devices. Is there a way to find out how many KDF iterations are currently being used? The settings page defaults to 100,000 instead of the current value. Feb 4, 2023. I’m writing this to warn against setting to large values. Keep in mind having a strong master password and 2FA is still the most important security aspect than adding additional bits of. Remember FF 2022. Not sure if this is already on the @Quexten’s and Bitwarden devs’ list of things to do, but I think it would be very helpful to update the Interactive Cryptography Tool to include an implementation of the new Argon2 KDF Support (including the ability for users to test the settings for iterations, memory, and parallelism parameters). 2 million USD. Now it works! Seems to be a bug between the BitWarden extension and a Vault that has 100000 KDF iterations. I think the . Exploring applying this as the minimum KDF to all users. KeePassium has suggested 32 MiB as a limit for Argon2 on iOS, but I think that Bitwarden’s default setting of 64 MiB should be OK (since they did do some testing before the release, which presumably included some iOS devices). If your keyHash value is from later than June 9, 2021, you will need to save a copy of the HTML code of this webpage. RogerDodger January 26,. With the ambiguity in some of the Bitwarden staff responses, it is difficult to say at this time what is going on. Instead of KDF iterations, there is a “Work Factor” which scales linearly with memory and compute. The current KDF, PBKDF2 uses little to no memory, and thus scales very well on GPUs which have a comparatively low amount o… Ok, as an update: I have now implemented scrypt for the mobile clients. With the ambiguity in some of the Bitwarden staff responses, it is difficult to say at this time what is going on. I increased KDF from 100k to 600k and then did another big jump. Increasing KDF interations grb January 2, 2023, 6:30pm 2 Nothing wrong with your approach, but it may be unnecessarily cautious. PBKDF2 100. I thought it was the box at the top left. the time required increases linearly with kdf iterations. Bitwarden currently has a default setting of 100,001 iterations client-side with an additional 100,000. ? Have users experienced issues when making this change to an existing Bitwarden account? I know the CYA answer is to always backup the data, which I would do, but I would like to be aware of any potential problems that might arise. If all of your devices can handle it (looking at you, Android), you could just bump up to 2,000,000 and be done second-guessing yourself. Not sure if this is already on the @Quexten’s and Bitwarden devs’ list of things to do, but I think it would be very helpful to update the Interactive Cryptography Tool to include an implementation of the new Argon2 KDF Support (including the ability for users to test the settings for iterations, memory, and parallelism parameters). The point of argon2 is to make low entropy master passwords hard to crack. 2 Likes. We recommend that you increase the value in increments of 100,000 and then test all of your devices. 8 Likes. The user probably wouldn’t even notice. Exploring applying this as the minimum KDF to all users. ddejohn: but on logging in again in Chrome. Steps To Reproduce Set minimum KDF iteration count to 300. Regarding password protected exports, the key is generated through pbkdf2 and stretched using hkdf. My understanding is that a strong master password should still be secure even with a low number of KDF iterations, but for a product like a password manager, the bar should probably be higher than that. 10. 2 Likes. alfonsojon (Jonathan Alfonso) May 4, 2023, 2:46pm 1. This is equivalent to the effect of increasing your master password entropy by 2 bits, because log2(2000000/500000) =. app:web-vault, cloud-default, app:all. . Check the upper-right corner, and press the down arrow. Don't worry about changing any of the knobs or dials: just change KDF algorithm completely. The hash credential to login to Bitwarden servers is only 1 PBKDF2 iteration from the vault master key. You should switch to Argon2. For algorithm, I choose PBKDF2 SHA-256 and set my iterations to 500,000. Change the ** KDF iterations** to 600000 (Six Hundred Thousand) or higher! Keep in mind that this doesn't do you much good however if you have a weak master password. Let them know that you plan to delete your account in the near future,. The feature will be opt-in, and should be available on the same page as the. Still fairly quick comparatively for any. The point of argon2 is to make low entropy master passwords hard to crack. Then edit Line 481 of the HTML file — change the third argument. Please keep in mind that for proper cracking rigs with a lot more GPU power the difference between PBKDF2 cracking and Argon2 cracking will be even greater!The KDF iterations increase the cracking time linearly, so 2,000,000 will take four times as long to crack (on average) than 500,000. Exploring applying this as the minimum KDF to all users. By the way, Sends (which I don’t really use) also have 100K fixed pbkdf2. By the way, Sends (which I don’t really use) also have 100K fixed pbkdf2. The user probably wouldn’t even notice. New Bitwarden accounts will use 600,000 KDF iterations for. Now I know I know my username/password for the BitWarden. Parallelism = Num. However, what was more sharply criticized was the failure of LastPass to migrate older accounts to their new default, with many older accounts being left at 5,000 iterations and even reports of accounts with the iterations set to as low as 1. ” From information found on Keypass that tell me IOS requires low settings. Feature function Allows admins to configure their organizations to comply with change in recommendations over time (as hash compute capabilities increase, so does the need for increasing KDF iterations). Now it works! Seems to be a bug between the BitWarden extension and a Vault that has 100000 KDF iterations. I don’t think this replaces an automatic migration or at least global notifications for iterations set below the default, but it is still a good suggestion. I just found out that this affects Self-hosted Vaultwarden as well. More recently, Bitwarden users raised their voices asking the company to not make the same mistake. If you want to do manual brute-force guesses, go to Bitwarden’s interactive cryptography tool. No, the OWASP advice is 310,000 iterations, period. My understanding is that a strong master password should still be secure even with a low number of KDF iterations, but for a product like a password manager, the bar should probably be higher than that. However, what was more sharply criticized was the failure of LastPass to migrate older accounts to their new default, with many older accounts being left at 5,000 iterations and even reports of accounts with the iterations set to as low as 1. With the warning of ### WARNING. Exploring applying this as the minimum KDF to all users. Ask the Community Password Manager. Exploring applying this as the minimum KDF to all users. It has to be a power of 2, and thus I made the user configurable work factor a drop down selection. But they don’t even store the kdf / iterations in the database, so changing it would require another database migration / backend change which I didn’t really feel like taking on considering how low the risk for a send is anyways. This operation logs the user out of all accounts in any event so it should be relatively low friction to update the KDF iterations simultaneously. I logged in. #1. The hash credential to login to Bitwarden servers is only 1 PBKDF2 iteration from the vault master key. Set the KDF iterations box to 600000. Can anyone share which part of this diagram changes from 100,000 to 2,000,000. This operation logs the user out of all accounts in any event so it should be relatively low friction to update the KDF iterations simultaneously. We are in the process of onboarding an organization and I would like to be able to set a security baseline by having a default KDF iteration count for all accounts on the organization level. The feature will be opt-in, and should be available on the same page as the. This operation logs the user out of all accounts in any event so it should be relatively low friction to update the KDF iterations simultaneously. 12. I don’t think this replaces an automatic migration or at least global notifications for iterations set below the default, but it is still a good suggestion. GitHub - quexten/clients at feature/argon2-kdf. Exploring applying this as the minimum KDF to all users. In contrast, Dmitry Chestnykh wrote a well-researched piece in 2020 (with an update in January 2023) that describes exactly how a brute-force attack against a stolen Bitwarden vault would be possible using only 100,000 PBKDF2 iterations (or the KDF iteration value set by the user) per password guess, and even proposed an improved authentication. This operation logs the user out of all accounts in any event so it should be relatively low friction to update the KDF iterations simultaneously. Can anybody maybe screenshot (if. Set the KDF iterations box to 600000. If you don’t have a locked vault on your device and you are logging in, then there is an unauthentication prelogin in which fetches the number of KDF iterations from the server, that part is true. Bitwarden Community Forums. the threat actors got into the lastpass system by. 5. Bitwarden Increases KDF iterations to 600k for new accounts and double-encrypts data at rest. More specifically Argon2id. Based on the totality of the evidence available to date (as summarized above), my best guess is that the master password hash stored in the cloud database became corrupted when you changed the KDF iterations. The client has to rely on the server to tell it the correct value, and as long as low settings like 5,000 iterations are supported this issue will remain. Not sure if this is already on the @Quexten’s and Bitwarden devs’ list of things to do, but I think it would be very helpful to update the Interactive Cryptography Tool to include an implementation of the new Argon2 KDF Support (including the ability for users to test the settings for iterations, memory, and parallelism parameters). All around great news and a perfect example of a product built on open source code actively listening to its community! Mastodon Post: Bitwarden Security Enhancements Respect. The higher the memory used by the algorithm, the more expensive it is for an attacker to crack your hash. My understanding is that a strong master password should still be secure even with a low number of KDF iterations, but for a product like a password manager, the bar should probably be higher than that. Bitward setting for PBKDF2 is set low at 100,001 and I think 31,039,488 is better . One thing I would like an opinion on: the current PBKDF only needs an Iteration count, and sends this via tha API / stores it. 995×807 77. recent information has brought to light that Bitwarden has a really low KDF iteration on cloud-hosted (5,000) and a relatively low default on self-hosted instances (~100,000). This operation logs the user out of all accounts in any event so it should be relatively low friction to update the KDF iterations simultaneously. Palant said this flaw meant that the security level of Bitwarden is identical to what LastPass had. Exploring applying this as the minimum KDF to all users. Or it could just be a low end phone and then you should make your password as strong as possible. If you want to do manual brute-force guesses, go to Bitwarden’s interactive cryptography tool. The default parameters provide stronger protection than 600,000 PBKDF2 iterations, and you may get the additional protection without any performance loss. Gotta. Another KDF that limits the amount of scalability through a large internal state is scrypt. 2 Likes. The point of argon2 is to make low entropy master passwords hard to crack. Based on the totality of the evidence available to date (as summarized above), my best guess is that the master password hash stored in the cloud database became corrupted when you changed the KDF iterations. Higher KDF iterations can help protect your master password from being brute forced by an attacker. Navigate to the Security > Keys tab. I have done so with some consternation because I am sensitive to the security recommendation inherent in the warning message. Do keep in mind Bitwarden still needs to do QA on the changes and they have a 5 week release cycle. OK fine. My account was set to 100000 by default!! To change it log into your WebUI and go to Account > Security > Keys. I'm curious if anyone has any advice or points of reference when it comes to determining how many iterations is 'good enough' when using PBKDF2 (specifically with SHA-256). If you want to avoid feelings of inadequacy when Bitwarden ups the default iterations to 600,000 in a month or two, you can go ahead and increase your KDF iteration value to 600k. The user probably wouldn’t even notice. By the way, Sends (which I don’t really use) also have 100K fixed pbkdf2. One thing I would like an opinion on: the current PBKDF only needs an Iteration count, and sends this via tha API / stores it. Now I know I know my username/password for the BitWarden. 12. . Low KDF iterations. This article describes how to unlock Bitwarden with biometrics and. Bitwarden Increases KDF iterations to 600k for new accounts and double-encrypts data at rest. I went into my web vault and changed it to 1 million (simply added 0). Iterations (i) = . Unless there is a threat model under which this could actually be used to break any part of the security. Can anybody maybe screenshot (if. Okay. High kdf iterations aren't necessary if your main password is actually strong, though if your phone struggles with 100k iterations it could be very old and you shouldn't be storing passwords on it. At our organization, we are set to use 100,000 KDF iterations. Ask the Community. Security expert, Dmitry Chestnykh, had mentioned this problem in 2020 , yet it still remains unresolved. log file is updated only after a successful login. Due to the recent news with LastPass I decided to update the KDF iterations. 4. Bitwarden currently has a default setting of 100,001 iterations client-side with an additional 100,000. Based on the totality of the evidence available to date (as summarized above), my best guess is that the master password hash stored in the cloud database became corrupted when you changed the KDF iterations. I guess I’m out of luck. Now I know I know my username/password for the BitWarden. 2 Likes. This is what I did: Changed the KDF iterations setting from the default 100,000 to the new default of 350,000. Bitwarden will allow you to set this value as low as 5,000 without even warning you. Changed my master password into a four random word passphrase. If you want to do manual brute-force guesses, go to Bitwarden’s interactive cryptography tool. 2. If a user has a device that does not work well with Argon2 they can use PBKDF2. I was asked for the master password, entered it and was logged out. Therefore, a rogue server could send a reply for. In order to increase to the new default number of iterations, what should be the order of operation - do I need to change the server side value to 600000 first? This operation logs the user out of all accounts in any event so it should be relatively low friction to update the KDF iterations simultaneously. Setting your KDF iterations too high could result in poor performance when logging into (and unlocking) Bitwarden on. More specifically Argon2id. 1. For scrypt we could get by, by setting the work factor N (which influences both computation and memory) and store this in the KDF Iterations (although ideally a user could configure the other parameters too).