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Mar
23
comment Is this approach to generating a “random” number from a sha512 hash effective?
The list of participants' names might not have enough entropy to prevent you from cheating even without help from others. In particular, if you can guess who might sign up for the raffle (and in what order), you could compile a bunch of likely participant lists in advance, and, after testing a large number of possible secret inputs against those lists, select the one that has the best chance of giving you a favorable outcome if the actual participant list happens to match one of your guesses.
Mar
23
reviewed Needs Improvement Is this approach to generating a “random” number from a sha512 hash effective?
Mar
21
answered SHA-224 Purpose
Mar
13
comment I need a 64-bit cryptographic hash for 96 bits of data
+1. The birthday bound is a harsh mistress.
Mar
13
revised Can a monoalphabetic substitution cipher attain perfect secrecy?
deleted 24 characters in body
Mar
13
answered Can a monoalphabetic substitution cipher attain perfect secrecy?
Mar
13
revised Can a monoalphabetic substitution cipher attain perfect secrecy?
latex formatting
Mar
7
answered Rfc2898DeriveBytes - password length
Mar
6
revised Authenticated encryption without padding
rolled back to a previous revision
Mar
6
revised Authenticated encryption without padding
better title and tags, copyedit, clarify
Mar
4
awarded  Popular Question
Feb
20
comment How to represent a 32-byte SHA2 hash in the shortest possible string?
For case-insensitive file systems, it's probably best to stick with base 32 or 36, which can be encoded using single-case letters and numbers. In particular, the distinct printable ASCII characters allowed in Windows file names are not quite enough to encode six bits per character: there are 9 reserved characters and 26 equivalent upper/lowercase pairs, leaving only 60 usable characters (including space, which you don't seem to count; also, some file systems may have additional reserved characters).
Feb
20
revised Why does second pre-image resistance imply pre-image resistance
copyedit, transcribe image, add a bit more context from Katz & Lindell
Feb
20
revised Why does second pre-image resistance imply pre-image resistance
edited tags
Feb
20
revised Does a break in a collision resistance property of a hash function by definition implies an attack at the first pre-image attack?
edited tags
Feb
20
revised md5sum collision question
edited tags
Feb
20
revised Is it possible to pick your Ed25519 public key?
edited tags
Feb
20
revised Pseudo preimage for a hash made from a cipher
edited tags
Feb
20
revised No SHA-1 collision? Yet SHA-1 is broken?
edited tags
Feb
20
revised Adversary to Any Collision Resistance Hash Function
edited tags