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View Full Version : decryption



anarchy3200
05-15-2004, 04:59 PM
quick question

what encryption methods are decryptable, thanks

raf
05-15-2004, 05:11 PM
quick answer

all encoding methods + all reversible hash-methods
hash-methods like md5, sha1 and sha2 are non-reversible.

anarchy3200
05-15-2004, 06:53 PM
what reversable hash methods are there, i've just been looking around and havn't been able to find any.

raf
05-15-2004, 11:43 PM
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()



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