All Questions
Tagged with compression sha-256
4 questions
9
votes
3
answers
4k
views
Can one use a reversible hash algorithm as a compression function?
As we know any input to SHA-256 will be returned as 64 hex length output. Is it possible to create a hash that can do the same thing as SHA-256 but can be reversed, so if we have the output of 64 ...
- 107
2
votes
1
answer
663
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Can we calculate the "previous hash value" in the SHA256 compression function with a known message block and final hash?
Suppose we have a $512$-bit (or $512\times n$ bit) message that we'd like to hash using SHA-256. I've looked at the implementation, and from what I understand, after padding, there will be a total of $...
- 21
2
votes
1
answer
864
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Building blocks of SHA-1 and SHA-2
I ask myself some questions about the compression function of SHA-2 (and SHA-1) hash function. Are these compression functions based on a block cipher? I've not found this information on Wiki... So, I ...
- 31
1
vote
1
answer
1k
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SHACAL-2 vs. AES as underlying block cipher for Secure Hash (aka SHA-256)
The hashing scheme SHA-256 (for instance) is based on Merkle-Damgård construction with the underlying compression function based on the block cipher SHACAL-2 configured in Davies Meyer mode. SHACAL-2 ...
- 1,105