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Oct
4
awarded  Critic
Oct
2
answered Using multiple secret keys
Oct
2
revised Why does ROT13 provide no cryptographic security?
fixed math
Oct
2
revised attribute-based-encry wiki excerpt
added 289 characters in body
Oct
2
revised attribute-based-encry wiki description
added 1052 characters in body
Oct
2
answered NIST temporarily closed — will that have a negative impact on the future of cryptography?
Oct
2
wiki created attribute-based-encry description
Oct
2
wiki created attribute-based-encry excerpt
Oct
2
suggested suggested edit on attribute-based-encry tag wiki
Oct
2
suggested suggested edit on attribute-based-encry tag wiki excerpt
Sep
30
answered Is it possible to create an open-source SecurID?
Sep
30
revised What are requirements for this grille?
Renamed from Cardan grille (incorrect) to Fleissner grille (correct)
Sep
30
revised What are requirements for this grille?
Added recommendation to edit question
Sep
30
answered What are requirements for this grille?
Sep
30
comment What are requirements for this grille?
I remember long ago reading some old books on historical ciphers talking about flipping and/or inverting the Cardano grille as an additional (rudimentary) key step. See en.wikipedia.org/wiki/Cardan_grille, which illustrates "Four positions of the grille", and an entire section on turning grilles here: en.wikipedia.org/wiki/Grille_%28cryptography%29#Turning_grilles
Sep
30
comment Are NIST's changes to Keccak/SHA-3 problematic?
80 bits is sufficient security for a symmetric encryption key; but I don't know if the same is true for a hash algorithm, where the attacks are very different.
Sep
25
comment Is there a developer's resource that ties encryption methods and strengths to the appropriate usage scenarios?
I think it's a fair question, when you look at it this way: what is a good approach to selecting cryptographic solutions? @RichieFrame 's answer below is a good one: start with a trustworthy document.
Sep
17
comment probability of N hash digits colliding
@kylek, the answer is still correct, regardless of what data you are hashing to get the five digits.
Aug
26
answered Is there a public key encryption scheme with optimal key size?
Aug
26
comment Multiple parties must encrypt and get the same result
@NickP, there are a few more details to consider. Make sure the GetToken(cardNo) service is as securely controlled as the GetCardNo(token) service, in order to prevent this attack. Also, my earlier statement about using sequence numbers as tokens could leak information about "unseen" vs "previously seen" numbers, so I wouldn't use sequence numbers as tokens.