A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.

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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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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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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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Key rotation refers to a schedule or process for changing the key material.
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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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Needham–Schroeder refers to both, a symmetric key or a public key authentication protocol.
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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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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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RFC 1320 — the MD4 message-digest algorithm — is a cryptographic hash function with a digest length is 128 bits, developed by Ronald Rivest in 1990.
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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 homomorphic signature scheme (also malleable signature scheme) is a digital signature scheme that allows computations on signed data (without access to the secret signing key) while preserving the…
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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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a cryptographic hash function. It was designed for the SHA-3 competition where it became a finalist, but wasn't chosen as SHA-3.
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an SQL-Aware encrypted database system from MIT
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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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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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the average amount of ciphertext a computationally unlimited attacker needs to obtain in order to uniquely determine the correct decryption.
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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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A famous program that was the de-facto standard for open-source disk encryption for many years. It was discontinued on 28 may 2014. TrueCrypt has undergone some security audits which haven't found sev…
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the process of intercepting and examining messages in order to deduce information from patterns in communication. Within cryptography this definition is restricted to deduce inform…
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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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a block cipher by David Wheeler and Roger Needham of the Cambridge Computer Laboratory; notable for its simplicity of description and implementation.
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a Crypto SDK was developed by Microsoft to support experimentation with the foundational features of the U-Prove technology. It is made available under the Apache 2.0 open-source license, w…
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The Cryptographic Application Programming Interface is an application programming interface included with Microsoft Windows operating systems that provides services to enable developers to secure Wind…
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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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Cramer-Shoup asymmetric encryption (an extension of ElGamal)