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Thread: coding crypto or crypto coding

  1. #1
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    coding crypto or crypto coding

    This is for the smart ones, I'll be in the garage working on an oil change!
    http://www.schneier.com/blog/archive...a1_broken.html

  2. #2
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    lets do a bit of math...

    so instead of 2^80 operations it can now be done in 2^69 operations (for full sha-1)

    efectively your dividing the cracking time by 2^11 (2048 non math people)...

    i'm still not worried

    Code:
    maccorin@debian:~$ echo "2^80"|bc
    1208925819614629174706176
    maccorin@debian:~$ echo "2^69"|bc
    590295810358705651712
    maccorin@debian:~$
    now taking my bogomips of 4128 (bad measurement... i know, but we'll make up for it by assuming each hash operation equates to ONE cpu operation, which is SOOOOO FAR from realistic)

    Code:
    maccorin@debian:~$ echo "2^69 / (4128 * 1000000)"|bc
    142998016075
    that's how many seconds it would take (under these very unrealistic conditions to crack

    or this many days
    Code:
    maccorin@debian:~$ echo "(2^69 / (4128 * 1000000)) / (60*60*24)"|bc
    1655069
    or... 4534 YEARS (on an athlong XP2800, at one hash operation PER cpu-operation (*wrong!... it would take a lot more then this, but since we are talking about a constant it can be made up for by faster hardware... so we just pertend we live in a perfect world*)

    now, while the 9286527 years it would take by brute force is much more comforting... i'd say it's still ok to use sha-1 to check your iso from debian...

  3. #3
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    for you people that aren't into math, basically my above post means that if you have a super-computer with thousands of processors, you can apparently break sha-1 in a realistic time now (year or so? as a simple guess...)

    whereas you can NOT do 2^80 operations in a realistic time (it would take 2048 times longer then doing 2^69 operations)

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