hashcat Forum
hash of a hash - Printable Version

+- hashcat Forum (https://hashcat.net/forum)
+-- Forum: Deprecated; Previous versions (https://hashcat.net/forum/forum-29.html)
+--- Forum: Old oclHashcat Support (https://hashcat.net/forum/forum-38.html)
+--- Thread: hash of a hash (/thread-3187.html)

hash of a hash - coiner232 - 03-02-2014

I have a ripemd160 hash that is the hash of an sha256 hash of plaintext. Is there any way to recover the hex values of the sha256 hash so I can recover the plaintext? To be clear:

1. original plaintext: ???????????? UNKNOWN

2. SHA256 of 1: xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx UNKNOWN

3. RIPEMD160 of 2: KNOWN

My question is how to recover the SHA256 hash?

RE: hash of a hash - Mem5 - 03-02-2014

Your SHA256 hash is a plain-text for RIPEMD160.
So you consider it as a classic password. You know the length (64 characters) and the charset (hexadecimal).
But your problem here is that 64 characters is huge to bruteforce, and probably not in dictionnary.

RE: hash of a hash - philsmd - 03-02-2014

It is not working like that, instead you need a cracker that supports the algorithm:

RipeMD160 (SHA256 (pass))

where SHA256 output is in hex I suppose

Currently hashcat does not support this format. Where is this format used?