Decrypt PHP crypt() function without salt

Question

I have a small problem. In fact, I have a string crypted with the PHP function crypt(), with only one parameter (without the salt parameter). I would like to know if it is possible to decrypt the password if it was crypted that way?

Thank you in advance!

see this http://stackoverflow.com/questions/1161157/is-there-a-way-to-reverse-a-crypt-in-c — , Feb 11 '14 at 10:04

score 3 · Accepted Answer · answered Feb 11 '14 at 10:02

3

No, this is impossible, because simply crypt() is a One-way string hashing.

You can, however, use brute force but it will be too bad if the password is lengthly...

answered Feb 11 '14 at 10:02

score 0 · Answer 2 · answered Feb 11 '14 at 10:03

0

Function crypt() uses a one-way algorithm, there is no decrypt function.

answered Feb 11 '14 at 10:03

Donnie Rock

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score 0 · Answer 3 · answered Feb 11 '14 at 10:04

Well, crypt returns the digest of a hash algorithm which by design can't be reversed. Whether or not you posses the salt is irrelevant in this case.

You can try online Rainbow Tables like those at CrackStation to possibly look the hash up. Your only other alternative is to brute force the hash.

Decrypt PHP crypt() function without salt

3 Answers3