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For questions about bitsliced (SIMD-within-a-register / SWAR) implementation of ciphers and other cryptographic primitives.
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Copy protection or content protection covers various mechanism, such as DRM and software license keys, used to restrict the unauthorized copying or use of software or digital media.
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Questions related to the teaching and learning of cryptography.
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a cryptanalysis method based on analysis of the correlation between the power consumption of a chip (in a smart card for example) and the secret key it contai…
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a type of public-key encryption scheme that allows to transform ciphertexts encrypted under Alice's public key into ciphertexts decryptable by Bob
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Public-Key Cryptography Standard, number 8, describes the Private-Key Information Syntax Standard which is used to carry (encrypted or unencrypted) private certificate keypairs. See [RFC 5208](http://…
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A PIR (Private Information Retrieval) protocol allows a user to retrieve an item from a server in possession of a database without revealing which item is retrieved.
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The Offset CodeBook Mode, an authenticated encryption mode of operation for a block cipher.
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so unimportant, that it isn't worth considering. For example, if a flaw in a cryptographic algorithm is considered to be negligible, it is insignificant to both the …
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the problem of determining which numbers from a given collection of numbers have been added together to yield a specific sum: used in cryptography to encipher (and sometimes decipher) mess…
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a Feistel cipher where in each round the nonlinear function used is assumed to be chosen uniformly at random from the set of all such functions. These ciphers are mainly of th…
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Something of mixed origin. In cryptography, typically a cipher system containing both public key and secret key component ciphers, where the public key system is used only to transport the key for the…
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The International Data Encryption Algorithm (IDEA) is a block cipher developed in 1991 by James Massey and Xuejia Lai.
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to "scramble" or mix the internal state of a hash (or cipher) function. The input to the function is the current internal state and the output of the function bec…
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Needham–Schroeder refers to both, a symmetric key or a public key authentication protocol.
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Plausible deniability may refer $1)$ to deniable encryption schemes allowing to decrypt a ciphertext for a message $m$ to some distinct message $m'$ or $2)$ to a feature provided by deniable file syst…
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a family of binary, linear error-correcting codes that are used to detect and correct data transmission errors. Hamming codes are able detect up to two simultaneous bit errors and ca…
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short-lived, like (for example) an ephemeral key, which is a key that only exists within the lifetime of a communication session.
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Carter-Wegman MACs build a provably secure MAC from a universal hash
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a function $f$ from a set $X$ to a set $Y$ with the property that, for every $y$ in $Y$, there is exactly one $x$ in $X$ such that $f(x) = y$. It follows from …
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the average amount of ciphertext a computationally unlimited attacker needs to obtain in order to uniquely determine the correct decryption.
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a toy variant of the DES cipher introduced by Edward F. Schaefer in 1996 for educational purposes. It has an 8-bit block size and a 10-bit key, and uses two rounds, with two 4x2 bit …
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The Schnorr Identification Protocol relies upon the security of the Discrete Logarithm Problem. Schnorr's protocol was introduced after, and is comparable to, the identification protocol of Fiat and S…
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Secure/Multipurpose Internet Mail Extensions, or short S-MIME, is a standard for public key encryption and signing of MIME data.
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A family of lightweight symmetric block-ciphers designed for good performance in constrained software devices with block sizes ranging from 32 to 128 bits and key sizes ranging from 64 to 256 bits.
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The three-pass protocol uses commutative encryption to let two people communicate privately without having to exchange keys in advance.
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Remote data checking protocols allow a client that has stored data at an untrusted server to efficiently verify that the server possesses the original data without retrieving it.
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a variant of the Salsa20 cipher with a longer nonce.
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Design philosophy for ciphers. ARX solely relies on additions, rotations and XORs to build ciphers and similar algorithms. This usually constructs ciphers that are highly resistant against side-channe…
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a cryptographic pseudorandom number generator intended to be used in a stream cipher.
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the most important hardware component of a computer system, since it contains the circuitry necessary to interpret and execute instructions.
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Diffusion refers to the property of an encryption primitive that small changes in the plaintext result in big changes in the ciphertext and vice-versa.
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an SQL-Aware encrypted database system from MIT