Cryptography Weekly Newsletter - Tuesday, June 30, 2015

Cryptography newsletter

2015 Community Moderator Election The community moderator election is currently in the election phase. Please cast your vote by June 30! Top new questions this week: Dan Boneh's Cryptography lecture - problem with 802.11b I am going through Dan Boneh's Cyprography lectures on Coursera. In Lecture 6 https://class.coursera.org/crypto-010/lecture/6 At 7:30 minutes, he discusses the problems with 802.11b design. I ... keys stream-cipher prg   asked by user93353 5 votes answered by hakoja 7 votes Why does an algorithm need a keyspace? Why does an algorithm need a keyspace? I thought the person encrypting would define his/her own key. keys   asked by user1688175 4 votes answered by Ilmari Karonen 11 votes Simulation aborted because the adversary doesn't use the random oracle I'm trying to construct a proof for an encryption scheme in the Random Oracle model. This encryption scheme is like a PKE scheme but with an additional function that kind of "alters" ciphertexts ... provable-security random-oracle-model   asked by cygnusv 3 votes Source for PKCS#11 Header Files Is there a known authoritative source for the ANSI C header files for PKCS#11 Cryptoki? Specifically, I am having trouble locating pkcs11.h, pkcs11t.h, and pkcs11f.h for v2.30 and v2.40. Are there ... standards pkcs11   asked by user25339 3 votes answered by Mr. Stone 1 vote EdDSA Signature Algorithm - hash of secret key Why does EdDSA use the (SHA512) hash of the secret key as the exponent for the public key rather than using the secret key value directly? This seems inefficient and I can't see how it adds any extra ... elliptic-curves   asked by geoff_h 3 votes answered by CodesInChaos 2 votes El-Gamal and Lines on Planes I've been thinking about a geometric picture for El-Gamal. The idea is to understand the set $\{(my^{x},g^x) \mid x \in Z_p\}$ (the set of encryption of $m$ for fixed $g$ and $y$) by taking the ... reference-request discrete-logarithm elgamal-encryption universal-re-encryption   asked by NaN 3 votes AES and Homomorphic Encryption Is it possible to do the following? Input would be to generate a new AES key, encrypt the private data with that key, encrypt the AES key with the FHE key, and send the FHE-encrypted AES key along ... homomorphic-encryption   asked by Rima Shah 3 votes answered by cygnusv 2 votes Greatest hits from previous weeks: How is XOR used for encryption? I am a programmer, so when I hear XOR, I think about the bitwise operator (e.g. 0110 ^ 1110 = 1000). The mention of "XOR" comes up quite a bit in cryptography. Is this the same XOR as the bitwise ... encryption xor   asked by IQAndreas 10 votes answered by Nova 11 votes How secure is AES-256? The cipher AES-256 is used among other places in TSL/SSL across the Internet. It's considered among the top ciphers. In theory it's not crackable since the combinations of keys are massive. Although ... encryption tls aes   asked by Gustav 14 votes answered by erickson 13 votes Can you answer these? What happens if no final subtraction is done in Montgomery multiplication? I'm doing Montgomery arithmetic modulo $N = 2^{255}-19$ for the Curve25519, picking $R = 2^{256}$ for Montgomery. After multiplying two numbers $0 <= A,B < N$ in the Montgomery representation ... elliptic-curves modular-arithmetic montgomery-multiplication   asked by NumberFour 1 vote RSA Signature Forgery We all know that x509 certificates carry a signature that represents the certificate digest encrypted by the private key of the issuer. I believe that the digest is encrypted only providing one ... rsa public-key signature   asked by kub0x 1 vote Logjam-style attack on Factoring? We're all aware of the Logjam attack, which is known as "FREAK on discrete logarithms". Now the attack works by doing a large pre-computation step, which needs only to be done once per field and then ... logjam   asked by SEJPM 1 vote

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