Difficulty of finding another input string that hashes to the same value as a given string
9
votes
1answer
184 views
Which MACs can be converted into a secure unkeyed hash function?
It is known that setting the secret key to a fixed, public value does not make MACs like CBC-MAC or GMAC into secure unkeyed cryptographic hash functions that could be used - for instance - for ...
4
votes
1answer
370 views
Is a second preimage attack on MD5 feasible?
What's the practical status of MD5 w.r.t. second-preimage?
Integrity of a piece of data is protected by an MD5 hash, itself assumed genuine. The data (and thus the hash) is known to the adversary. ...
2
votes
1answer
480 views
Why doesn't preimage resistance imply the second preimage resistance?
Let the preimage resistance be defined as »given a hash value $h$, it is hard to find any message $m$ such that $\operatorname{hash}(m)=h$«, and let the second preimage resistance be defined as »given ...
1
vote
3answers
295 views
reverse of md5sum
This might be out of ignorance, I apologize, but how complex of a problem might it be to generate a file of size N whose md5sum is X?
For example,
...
0
votes
0answers
59 views
Hash Digest Legal Status [closed]
What is legal status of document digest? Are there special regulations which hash functions are considered in legalise?
Most important: Which digest functions would be reasonable nowadays for ...
