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marcan42's profile
Hector Martin
Hector Martin
Hector Martin
@marcan42

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Hector Martin

@marcan42

If it ain't broke, I'll fix it! · 壊れてねぇのに直すぞ!日本語でもOK! · He/him.

Tokyo, Japan
marcan.st
Joined May 2009

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    Hector Martin‏ @marcan42 Jan 16
    • Report Tweet

    Hector Martin Retweeted Matthew Green

    Thread about numeric passcode strength on iPhones. And *this* is why I consider my rooted Android phone to be more secure than iPhones under a whole category of attack scenarios. Because I can use separate 25-character full ASCII *startup* password and an 8-digit *unlock* code.https://twitter.com/matthew_d_green/status/985885001542782978 …

    Hector Martin added,

    Matthew Green @matthew_d_green
    Guide to iOS estimated passcode cracking times (assumes random decimal passcode + an exploit that breaks SEP throttling): 4 digits: ~13min worst (~6.5avg) 6 digits: ~22.2hrs worst (~11.1avg) 8 digits: ~92.5days worst (~46avg) 10 digits: ~9259days worst (~4629avg)
    Show this thread
    8:33 PM - 16 Jan 2020
    • 14 Retweets
    • 60 Likes
    • Macil Vitaly Vidmirov Kr usernameOS Teemu Mykkänen Syler Max D. 3-5 30-50x elves in a trench coat Tomás García
    10 replies 14 retweets 60 likes
      1. New conversation
      2. Hector Martin‏ @marcan42 Jan 16
        • Report Tweet

        Sure, you can try to attack my phone from a powered-but-locked state, but if you screw up and it reboots, or if you attempt any boot chain attacks, or if the battery runs out, you are *not* getting in. Period.

        1 reply 1 retweet 7 likes
        Show this thread
      3. Hector Martin‏ @marcan42 Jan 16
        • Report Tweet

        I don't know why nobody offers this option of split FDE/unlock codes by default (neither iPhones nor stock Android). It's such a massive no-brainer to increase security to basically "unbreakable" under an entire class of practical attack scenarios.

        3 replies 1 retweet 18 likes
        Show this thread
      4. Hector Martin‏ @marcan42 Jan 16
        • Report Tweet

        (And we can already do this exact thing for FDE on desktops/laptops, so it's not like it's novel)

        2 replies 1 retweet 5 likes
        Show this thread
      5. End of conversation
      1. New conversation
      2. rcombs‏ @11rcombs Jan 16
        • Report Tweet
        Replying to @marcan42

        i mean… my unlock passcode is 20 chars

        1 reply 0 retweets 0 likes
      3. Hector Martin‏ @marcan42 Jan 16
        • Report Tweet
        Replying to @11rcombs

        My patience isn't that high :-)

        1 reply 0 retweets 1 like
      4. 3 more replies
      1. New conversation
      2. Dean Herbert‏Verified account @ppy Jan 17
        • Report Tweet
        Replying to @marcan42

        hmm i suddenly feel pretty safe with my 14 digit password

        1 reply 0 retweets 11 likes
      3. Mempler‏ @Mempler Jan 17
        • Report Tweet
        Replying to @ppy @marcan42

        I only have 32 digit passwords lol (doesn't work on every website though, as it's "too long")

        2 replies 0 retweets 3 likes
      4. 3 more replies
      1. New conversation
      2. Piero Ulloa‏ @piero512 Jan 17
        • Report Tweet
        Replying to @marcan42

        But having a custom recovery doesn't kind of defeat the purpose?

        1 reply 0 retweets 0 likes
      3. Hector Martin‏ @marcan42 Jan 17
        • Report Tweet
        Replying to @piero512

        No, why would it? The FDE passphrase is cryptographically bound to the userdata partition, it doesn't matter if you can compromise all software. At most, if you break the TrustZone bit (which is separate from custom rec), you can speed up the cracking attempt, but not enough.

        1 reply 0 retweets 3 likes
      4. 1 more reply
      1. New conversation
      2. Bit Rot Farmer‏ @bitrotfarmer Jan 17
        • Report Tweet
        Replying to @marcan42

        out of curiosity - does rooted equal unlocked bootloader? How do you prevent somebody from backdooring the password dialog?

        1 reply 0 retweets 0 likes
      3. Hector Martin‏ @marcan42 Jan 17
        • Report Tweet
        Replying to @bitrotfarmer

        You don't; I'm talking about people taking your phone, not evil maid attacks. I don't consider the latter in scope, because I don't really leave my phone unattended, basically ever.

        1 reply 0 retweets 1 like
      4. 1 more reply

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