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solardiz's profile
Solar Designer
Solar Designer
Solar Designer
@solardiz

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Solar Designer

@solardiz

@Openwall founder. RTs don't imply agreement with points of view.

openwall.com
Joined August 2012

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    1. Steven Murdoch‏ @sjmurdoch Aug 17

      Rewarding more complex passwords with a longer expiry results in stronger passwords but more password resets – is this tradeoff worth it? #usesec18 https://www.benthamsgaze.org/2018/08/17/stronger-password-longer-lifetime-studying-ucls-password-policy/ …pic.twitter.com/Ekl6aFuJfe

      However, from a cost-benefit analysis the intervention is counterproductive: All passwords at UCL fall into what Florencio et al. call the ‘Don’t care region of password strength’ wherein any increase in password strength provides no additional security.
      Cormac Herley, USENIX Security, USENIX Association and 2 others
      1. Cormac Herley @CormacHerley

      2. USENIX Security @USENIXSecurity

      3. USENIX Association @usenix

      4. Angela Sasse @m_a_sasse

      5. UCL ISD @uclisd

      6 replies 38 retweets 49 likes
    2. Solar Designer‏ @solardiz Aug 17
      Replying to @sjmurdoch @CormacHerley and

      A curious way to encourage use of stronger passwords, but the paper studies only a range of entropy values (if we ignore the poor applicability of entropy) that is irrelevant for online service passwords, not realizing the "don't care" range should end much earlier @TychoTithonus

      1 reply 0 retweets 3 likes
      Solar Designer‏ @solardiz Aug 17
      Replying to @solardiz @sjmurdoch and

      Where Shannon entropy applies (for generated passwords), 50 bits is a moderately strong password for an online service that uses a sequential memory-hard password hash function with per-user salts, assuming non-targeted offline attack. 50 to 120 is user torture for no reason.

      11:05 AM - 17 Aug 2018
      • 3 Retweets
      • 9 Likes
      • Mayank Varia Dominic White mittwinter Ḿ̴̴̷̷̛̤̪̥͑͆̑̽̕͘͘a̗͉̗͈ͬ͒́ͫ̕r̵̭͎̞͕͘͡͏k̭̪͆̈́̃̓ͧ͏̧̛̕͘͠ Graham Steel Matthew Green Royce Williams Aris Adamantiadis ☠ nowayout
      1 reply 3 retweets 9 likes
        1. New conversation
        2. Royce Williams‏ @TychoTithonus Aug 17
          Replying to @solardiz @sjmurdoch and

          Fair. I'd assumed that they were A) also aiming for offline resistance, and B) for compatibility-across-campus reasons, likely to have less control over which hash type to use. Would definitely be interested in more detail.

          1 reply 0 retweets 1 like
        3. Royce Williams‏ @TychoTithonus Aug 17
          Replying to @TychoTithonus @solardiz and

          The broader point is valid - that the mechanism for assessing strength of user-selected passwords is non-trivial, and must extend beyond Shannon entropy. The paper touches on this, but does not explain the Shannon choice (that I saw; maybe I missed it?)

          1 reply 0 retweets 1 like
        4. Cormac Herley‏ @CormacHerley Aug 17
          Replying to @TychoTithonus @solardiz and

          The choice of Shannon may not have been the authors. E.g., IT gives them some access but is going to do what it's going to do. Dinei and I used Shannon in the 2007 "Large-scale..." paper; we knew it was busted but we didn't decide what got measured.

          0 replies 0 retweets 2 likes
        5. End of conversation

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