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 Jun 29 answered Using bad generator in ElGamal Encryption Jun 18 answered Are there any differences between PIR, oblivious transfer and differential privacy? May 7 comment RSA reencryption scheme Section 4.3 of this paper has an example for RSA but it is unidirectional: www.isoc.org/isoc/conferences/ndss/03/proceedings/papers/14.pdf May 7 comment RSA reencryption scheme This is called proxy re-encryption and there are a lot of ways of doing it: en.wikipedia.org/wiki/Proxy_re-encryption Apr 30 awarded Enlightened Apr 30 awarded Nice Answer Apr 13 answered What are advantages of using a HMAC over RSA with SHA-1 hashes? Apr 13 answered Blind signature with openssl Apr 7 awarded Critic Mar 30 comment What challenge should I use in a challenge-response proof-of-work? Good point about multiple connections. You are right, in DoS prevention, I guess parallalization doesn't matter much. Yeah, scrypt is a nice way to meter based on processing power and memory accesses. Mar 30 answered What challenge should I use in a challenge-response proof-of-work? Mar 27 comment ZKIP for Paillier public key correctness Yes, the proof is very complicated. I would consider using the exponential version of Elgamal ($\mathsf{Enc}(g^m)$ instead of $\mathsf{Enc}(m)$, see tinyurl.com/CGS1997) instead of Paillier if possible. Mar 26 answered ZKIP for Paillier public key correctness Mar 26 revised Division in paillier cryptosystem edited tags Mar 20 answered Order Preserving Encryption for Numeric Data Values Mar 13 comment Division in paillier cryptosystem @user996522 It depends on how you define "makes sense." If $a/b = c$, then $c \cdot b=a$. It is the same thing here. If you compute $a/b$ under encryption, you will get the encryption of the value $c$ such that $c \cdot b \bmod{n} = a$. You can think of it as "discrete division" akin to a discrete logarithm. Mar 13 revised Division in paillier cryptosystem added 78 characters in body Mar 13 revised Division in paillier cryptosystem added 797 characters in body Mar 13 answered Division in paillier cryptosystem Mar 9 comment Why do we use encrypt-decrypt-encrypt (EDE) in 3DES, rather than encrypting three times? Duplicate on Security SE: security.stackexchange.com/questions/1886/…