decrytping question

[redder]

Can anyone tell me how to decrypt this?

{sha}nMu1CrT1mfCFIOrIbULfnY5g2/g=

[CptMurphy]

Read this to learn how SHA encryption works and how to, theoretically, crack it.

http://en.wikipedia.org/wiki/SHA-1

[phkninja]

it depends on which version of sha was used, because sha1 has been cracked (using alot of maths and computaional time, making it totally impractical for most people to break) but the modern version hasnt been cracked yet.

SHA is a secure hashing algo, supossed to be a one way function only. It was not designed for decrypting, it was designed for use as a passsword hash so youo can check someones password without hard coding it (and thus allow others access to it)

Counterpane Info

BTW why do you need to reverse it anyway??

Also this cant be sha1

nMu1CrT1mfCFIOrIbULfnY5g2/g=

Thats 28 characters, so using ASCII the characters are displayed in 7 or 8 bits per character.

7*28 = 196 bits

8*28 = 224 bits

SHA1, the version that has been cracked, is 160 bits only. So no chance of reversing it.

Edited April 13, 2007 by phkninja

[#rootworm]

you don't decrypt hashes, you calculate the the hash of a given file (or set of bytes) and see if it matches.

you "crack" hashes by creating a file that has the same hash as another file. this is called a collision.

for any given hash for any given algorithm for any given file there is an infinite number of possible collisions.

hashes are inherently insecure, just think about how they work. that is why they are always just a small part of a security implementation.

Edited May 2, 2007 by #rootworm