Description:
Different methods of data en/decryption.
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noob question about AES & pigeonhole principle
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Hi everyone ! This is a noob question. I've tried using AES recently (using SunJCE), & the result is surprising to me. If I try to encrypt a 3 bytes message using a 128 bits key, the cipherText is 128 bits (16 bytes), & when I decipher it the resulting message is 3 bytes. So apparently I can encrypt messages from 1 to 16 bytes, & the cipher... more »
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JSH: But is quadratic residue idea new?
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Finding a result is one thing but often I wonder afterwards, why is this result new? Now I'm in pondering mode as I consider something so trivially simple that it seems weird if it's NOT previously known. Because of the way congruences work, it's possible to do something interesting with quadratic residues, where I've simplified from the... more »
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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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