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Jun
13
comment Join Datasets While Protecting Anonymity
What about differential privacy?
May
5
comment Defining format-preserving encryption for natural language
You could use format-preserving encryption along with a word dictionary to create a permutation over all possible words in your given natural language.
Apr
30
comment Integer encryption preserving equality
Stream ciphers don't expand the ciphertext, but you have to store the nonce so that you can decrypt, which means a stream cipher can't be format-preserving.
Mar
30
awarded  Popular Question
Mar
27
comment Can machine learning analyze random number generator?
You can transform a block cipher in CTR mode into a RNG using NIST's CTR_DRBG, I'm pretty sure.
Mar
9
comment Is there a format preserving cryptographically secure hash?
You could maybe derive the FPE key from a SHA256 of the plaintext... Just spitballing here, but that might work.
Mar
2
comment Is format preserving encryption suitable for use with words or names?
Interestingly, this technique can be extended to build permutations over regular languages and context-free grammars: link
Mar
2
comment Is format preserving encryption suitable for use with words or names?
Exactly. The formal name for this construction is rank-then-encipher, and was first treated in Bellare et al.'s paper on the subject: link
Feb
20
reviewed Reject Is AES-256 weaker than 192 and 128 bit versions?
Jan
28
answered Is this a valid “fix” for deterministic encryption in encrypted databases?
Jan
22
comment Diffie-Hellman on infinite groups
Just spitballing here, but part of the problem might be that sampling uniformly from an infinite set can't be done easily.
Jan
2
comment Are there cryptographic hash functions which do not have any collisions?
Not unless its range is larger than or equal to its domain. Collisions are inevitable in all other cases because of the pigeonhole principle.
Dec
8
comment Looking For Additively Homomorphic Encryption
Why can't you use hidden group order?
Dec
3
comment What cipher algorithm is this routine using?
This question appears to be off-topic because it is about a specific software implementation of cryptography.
Dec
2
awarded  Popular Question
Dec
2
comment Using the same symmetric key in both directions?
This is verifiably false. Per-direction symmetric keys prevent replay attacks.
Dec
1
comment Verifying DER encoded DSA/ECDSA signature with extra content?
Well, what does the RFC say?
Dec
1
reviewed Reject SHA1 - SSL/TLS Cipher Suite
Nov
25
awarded  Tag Editor
Nov
25
revised searchable-encryption wiki excerpt
added 188 characters in body