John Kelsey is a cryptographer currently working at NIST. Cryptography (or cryptology; from Greek grc κρυπτός kryptos, "hidden secret" and grc γράφω gráphō, "I write" His research interests include cryptanalysis and design of symmetric cryptography primitives (block ciphers, stream ciphers, cryptographic hash functions, MACs), analysis and design of cryptographic protocols, cryptographic random number generation, electronic voting, side-channel attacks on cryptography implementations, and anonymizing communications systems. Cryptanalysis (from the Greek kryptós, "hidden" and analýein, "to loosen" or "to untie" is the study of methods for Symmetric-key algorithms are a class of Algorithms for Cryptography that use trivially related often identical Cryptographic keys for both decryption In Cryptography, a block cipher is a symmetric key Cipher which operates on fixed-length groups of Bits termed blocks, with an In Cryptography, a stream cipher is a symmetric key Cipher where plaintext bits are combined with a Pseudorandom cipher bit stream ( Keystream A cryptographic Hash function is a transformation that takes an input (or 'message' and returns a fixed-size string which is called the hash value (sometimes A cryptographic message authentication code (MAC is a short piece of information used to Authenticate a message A security protocol ( cryptographic protocol or encryption protocol) is an abstract or concrete protocol that performs a security -related function A cryptographically secure pseudo-random number generator ( CSPRNG) is a Pseudo-random number generator (PRNG with properties that make it suitable for use in Electronic voting (also known as e-voting) is a term encompassing several different types of Voting, embracing both electronic means of casting a vote and electronic In Cryptography, a side channel attack is any attack based on information gained from the physical Implementation of a Cryptosystem, rather than brute He previously worked at Certicom and Counterpane Internet Security. Certicom Corp ( is a cryptography company founded in 1985 by Gordon Agnew and Scott Vanstone. BT Counterpane, formerly Counterpane Internet Security Inc, is a company that sells managed computer Network security services
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