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Nov
21
comment Designing hash function in space-efficient identity based encryption
@poncho : $\:$ It would probably be important that the sampling of values $\hspace{2 in}$ with a Jacobi symbol of 1 be oblivious. $\;\;\;\;$
Nov
20
revised Cryptographic Operations and Security
improved grammar
Nov
19
answered Availability of a simple limited PRNG algorithm
Nov
19
comment Availability of a simple limited PRNG algorithm
Yes, there are at least 5 such PRNGs. $\;$
Nov
19
comment DHE key exchange. Is it really secure?
What "prefix" does Alice send to Bob? $\;$
Nov
19
revised Is it possible to determine a PGP public key from encrypted data?
inserted excerpts
Nov
18
reviewed Reviewed What does $\Pi$ represent in cryptography?
Nov
18
comment What does $\Pi$ represent in cryptography?
It can be "notation for the Encryption scheme in use", but isn't here. $\;$
Nov
18
revised How can I start the following crypto project?
fixed title's grammar
Nov
17
revised What does $\Pi$ represent in cryptography?
improved grammar
Nov
17
comment plaintext distribution ,perfect secrecy cryptosystem
However, "a perfect secrecy cryptosystem with specific plaintext probability distribution" would obviously be defined differently. $\;$
Nov
17
comment Secure Multiparty Sum in malicious model using threshold encryption
The NIZK protocols need to be simulation-extractable, rather than just plain NIZK. $\:$ The threshold decryption needs to be simulatable (I don't know whether or not most threshold PKE schemes provide that).
Nov
17
comment fully homomorphic encryption (FHE)
I think this is unusual because, for some circuits $g$, it will require far more homomorphic operations than handling gates with known outputs separately. $\:$ I'm not aware of any non-public-key candidates for FHE. $\;\;\;\;$
Nov
17
comment Collision resistant hash functions
What have you tried? $\;$
Nov
17
comment Secure Multiparty Sum in malicious model using threshold encryption
For step 1, you'll need each actor to have it's own NIZK setup string too. $\:$ Step 2 would require a definition of "additive homomorphic encryption" that is far stronger than the usual one, since it would need to handle the fact that the ciphertexts will have been encrypted under different public keys. $\:$ (Are you aware of any candidates for that?) $\;\;\;\;$
Nov
17
reviewed Close what is SALSA20 Nonce and its requirements
Nov
17
reviewed Close Pros and cons between HOTP and TOTP
Nov
17
reviewed Leave Closed RSA: Fermat-Euler Theorem - coprimality of message and modulus
Nov
17
reviewed No Action Needed Condition on Vector Boolean Function to be Bijective
Nov
17
comment Secure Multiparty Sum in malicious model using threshold encryption
Does "fully secure" mean secure against stronger adversaries than the $\hspace{2.14 in}$ kind described in your initial paragraph? $\;$