Cryptography Weekly Newsletter - Tuesday, July 29, 2014

Cryptography newsletter

Top new questions this week: The REACT transform and Replayable CCA Before stating my questions, let us recall the REACT transform [OP01], which enables to construct a CCA-secure hybrid PKE scheme, $\varepsilon'_{pk}$, from an OW-CPA PKE scheme … malleability ind-cca   asked by cygnusv 6 votes answered by Travis Mayberry 3 votes Elliptic Curve Cryptography I have been trying this for a while. But I couldn't get it. How can I determine the point of intersection of the tangent line at (0, 0) on the curve $y^2 + y = x^3 + x^2$ ? elliptic-curves   asked by Kiran 6 votes answered by albgarse 6 votes Is it secure to use Diffie-Hellman key agreement to generate a nonce? I have a system, using AES, in one of the modes that uses a nonce and authentication. We have a pre-shared key, and to agree about initial nonce we could use Diffie-Hellman, using the resulting … aes diffie-hellman initialization-vector   asked by Yoav R. 5 votes answered by otus 1 vote How does a rolling code work? I have general questions regarding rolling codes. Basically there is a sender and a receiver. Both have a sequence generator. The receiver checks if the received sequence matches the newly generated. … protocol-design authentication replay-attack   asked by matcauthon 5 votes answered by David Cary 7 votes Rainbow table for DES with all-zero plaintext? Consider the function $F$ from $\{0,1\}^{56}$ to $\{0,1\}^{64}$, mapping the operative bits of a DES key to the ciphertext for all-zero plaintext. How could we organize a rainbow table to invert that … cryptanalysis des rainbow-table   asked by fgrieu 5 votes answered by K.G. 4 votes OTT service using FPE Would it be possible to create an Over-The-Top communication utility that will encrypt voice using format preserving encryption (voice clear-text to audio encrypted stream) and send that over an … protocol-design format-preserving   asked by user1028028 4 votes answered by otus 2 votes Key Derivation from random salted seed, HMAC and HMAC based KDF I would like to generate a key which would be good enough to be used for encryption with AES in a mobile environment. My idea is to use as a seed ''random attributes'' from a mobile device. Is hashing … hmac salt kdf kbkdf   asked by Hashed 4 votes answered by owlstead 1 vote Greatest hits from previous weeks: What are the practical difference between 256-bit, 192-bit, and 128-bit AES encryption? AES has several different variants: AES-128 AES-192 AES-256 But why would someone prefer use one over another? encryption aes block-cipher key-size   asked by samoz 31 votes answered by Thomas Pornin 32 votes What is the difference between PKCS#5 padding and PKCS#7 padding One runtime platform provides an API that supplies PKCS#5 padding for block cipher modes such as ECB and CBC. These modes have been defined for the triple DES, AES and Blowfish block ciphers. The … encryption aes block-cipher modes-of-operation padding   asked by owlstead 13 votes answered by owlstead 16 votes Can you answer these? Where is the OID and ASN.1 specified for AES_CMAC? I have a requirement to implement AES_CMAC as the authentication algorithm in a CMS library. I just can't seem to find the OID and the ASN.1 definition for it. I expected to see the OID under … aes cmac   asked by Bryan 2 votes Universal hashing techniques based on matrix multiplication The article here says below, about a universal hashing technique based on matrix multiplications. "However, there is a little known method based on using a random matrix. It has lots of advantages - … hash universal-hash   asked by sashank 1 vote

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