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 Mar 27 comment Why is CRC said to be linear? Setting $c=0$ in the alternate equation might be a useful exercise: $crc(a) \oplus crc(b) \oplus crc(0) = crc(a \oplus b)$. Then, one naturally questions what $crc(0)$ evaluates to, tying into your point about starting at a nonzero state. Mar 11 awarded Nice Answer Mar 1 revised Why should I make my cipher public? Fix "it's" vs "its" Mar 1 revised Is truncating a SHA512 hash to the first 160 bits as secure as using SHA1? Add notes about some good comments Feb 25 comment What does the comma mean in m, c := E(K, m) Well, it's really from multiple perspectives... The first is just that the := symbol typically means "defined as", so it's good to use the same language as everyone else. The second is a little vaguer: In my experience teaching, a frequent source of student confusion is the difference between "derived"/"obtained" objects versus arbitrarily-named objects. Saying "c is defined as..." just highlights that we're calling this thing c, not that we did something special to arrive at a value for c. Feb 25 comment What does the comma mean in m, c := E(K, m) Probably better to say 'defined as' instead of 'equals'. At least, for pedagogical purposes. Feb 6 revised How to prove that a function F isn't a pseudo random function Edited post to use MathJax; fixed a couple grammatical errors; added primes to the function definitions (I assume this was the intent) Jan 17 comment Are there any advantages in using proprietary encryption? @DewiMorgan: This thread is about encryption, not hash functions. Besides, a concatenated "pepper" is better implemented with a real cryptographic construction, whether that's a MAC construction for a hash function (i.e. HMAC), encrypting password digests before storage, or (in newer password hash function designs) using the "pepper" as a server-side secret parameter (if available, e.g. Argon2's $K$ parameter). Oct 26 awarded Good Answer Sep 6 awarded Enlightened Sep 6 awarded Nice Answer Sep 5 revised Security strength of RSA in relation with the modulus size Remove irrelevant 3DES/block cipher paragraph; make Mathematica code a little more readable Jul 6 awarded Yearling Jul 5 revised 1 Billion Bit Encryption? Added note about lack of launch Jun 26 reviewed No Action Needed Simple protocol for 1-out-of-2 oblivious transfer Jun 26 reviewed Reviewed Establishing encryption key using shared secret Jun 25 answered If you have a file and XOR every bit with a random bit, can you extract any information? Jun 24 awarded Constituent Jun 21 wiki Jun 17 awarded Caucus