Description:
Different methods of data en/decryption.
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Security of crypto security measures
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Hi, How secure are the crypto security measures in practice today? In everyday life, it is trivial that, if one puts treasures in a safe, one has to consider how secure is the lock and even whether the gangsters could carry the safe away. In matters closer to crypto, UNIX, according to a revelation by one of its designers decades... more »
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Differential Privacy vs. Indistinguishable Encryption
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When talking about an indistinguishable encryption, it is required that the probabilities of distinguishing two encrypted plaintext differ negligibly. In contrast, in the definition of the differential privacy, it is required that the probabilities of getting the same results if computing a function on two data sets differing by at most... more »
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Combining stream and block encryption techniques
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Hi, In my humble understanding, in stream encryption each plaintext bit is processed independent of the others, while in block encryption it is a goal of the cipher design to maximize the interdependence of processing of the plaintext bits in a block (of a certain length) such that there is high avalanche effect in the resulting ciphertext bits of the block.... more »
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Noob Question about ENIGMA
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Hi, a question about code-breaking in WWII: Correct me If I'm wrong, but basically it worked like that: German radio traffic was encrypted wit ENIGMA machines and settings that were changed daily. In Bletchley Park, they had a nifty machine (or many) that could go trough all possible settings (usually within a few hours), so it... more »
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inverting a hash function
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Hi, I need to implement an algorithm to invert a hash function but I am not sure if it is possible: given a sequence of characters : ABC and a Hash function the following algorithm produces a hash. for each character i in the sequence of characters "ABC" H(X)=5453 XOR Char[i] (ascii code E.G 49); repeat till end of characters... more »
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Mendeley
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Hi, Since you're probably dealing with research papers and scholarly articles, we thought it might be of interest if we told you about Mendeley ([link]), a free research paper management and bibliography tool. Mendeley is a combination of free academic software (available for Windows, Mac and Linux) and a Web 2.0 research network - combined,... more »
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JSH: Understanding quadratic residues result
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Using very simple mathematics I've found a fascinatingly simple connection between the solution for a quadratic residue, and a factorization, where it is unbelievable how simple the mathematics is, so explaining it is trivial. Given a quadratic residue q, modulo N, where N is odd, I've found that given... more »
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