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  • 25 votes cast
Jan
8
awarded  Nice Question
Nov
21
comment Cryptanalysis to reverse engineer a hash?
@Pacerier, this question is 3 years old.
Oct
21
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24
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28
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19
awarded  Yearling
Jan
19
awarded  Good Question
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17
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14
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21
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Jan
20
comment A simple block cipher based on the SHA-256 hash function
This is almost the exact same algorithm as listed on this question: crypto.stackexchange.com/questions/48/… The answers there also provide some pretty good insight.
Dec
5
awarded  Commentator
Dec
5
comment Cryptanalysis to reverse engineer a hash?
This is technically off topic, based on question #3 in the FAQ. But... we can have fun every once in a while, right?
Nov
25
comment Is a book cipher provably secure?
Right, I would say that the main difference between this and a one-time pad is that: a one time pad's security is based on all possible pads that could be created, whereas a book cipher's security is based on all possible books that have been created.
Nov
12
accepted What are preimage resistance and collision resistance, and how can the lack thereof be exploited?