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Thread: decryption

  1. #1
    Regular Coder anarchy3200's Avatar
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    decryption

    quick question

    what encryption methods are decryptable, thanks

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    raf
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    quick answer

    all encoding methods + all reversible hash-methods
    hash-methods like md5, sha1 and sha2 are non-reversible.
    Posting guidelines I use to see if I will spend time to answer your question : http://www.catb.org/~esr/faqs/smart-questions.html

  • #3
    Regular Coder anarchy3200's Avatar
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    what reversable hash methods are there, i've just been looking around and havn't been able to find any.
    Last edited by anarchy3200; 05-15-2004 at 08:55 PM.

  • #4
    raf
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    all currently used hashfunctions are non-reversable.

    the value of a hash-function is exactly determined by the effort it takes to reverse it to get the original inputvalue, so as soon as it's compromised, it looses it's value.
    sha is harder to crackt then md5, but unless you have some supercomputers, the differnce is academic.

    your question doesn't realy makes sense. If you need something to enode a message you wan't to decode later on, then you should not look for hashfunctions, but for encryptionfunctions like
    http://www.php.net/manual/en/ref.mcrypt.php
    if you need something non-reversable, for instance to crypt password, then use a hashfunction ike sha1()
    Posting guidelines I use to see if I will spend time to answer your question : http://www.catb.org/~esr/faqs/smart-questions.html


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