0
votes
0answers
14 views

Why SHA-1 have 80 rounds? [migrated]

Why SHA-1 algorithm have exactly 80 rounds? Is it to reduce collisions? If yes, then why SHA-2 and SHA-3 have less number of rounds?
1
vote
1answer
322 views

Reversing a block hash of SHA-1 with known Plaintext?

Is it possible to reverse the hashing of a block in a Datastream fed to an SHA1 if the plaintext for that block is known? If it is not possible (which I assume) does it make attacks to retrieve the ...
7
votes
3answers
9k views

With ASIC bitcoin miners, should SHA256 be considered insecure for password hashing?

I'm sure everyone here has seen the rise and further rise of bitcoin. The process used for mining bitcoin is basically "let's brute force an SHA256 hash that is less than this amount" That being ...
1
vote
1answer
280 views

what does GUID have that a whirlpool, md5 or sha2 hash dont

I'm trying to understand the use of GUID and what has always left me wondering is what's so special about them that I should consider using them instead of rolling my own type of unique id. In other ...