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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a possible goal of cryptography, where the idea is to restrict access to documents, equipment, locations, or keys to individuals who are authorized such access.
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a 128-bit, symmetrical block cipher jointly developed by Mitsubishi and NTT of Japan.
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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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a cryptographic pseudorandom number generator intended to be used in a stream cipher.
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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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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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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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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 block cipher designed by NTT. It is known to be insecure.
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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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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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routing protocols that create hard-to-trace communications by using a chain of proxy servers known as mixes which take in messages from multiple senders, shuffle them, and send them b…
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a key derivation function ([tag:kdf]) that uses a key in the computation.
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Key rotation refers to a schedule or process for changing the key material.
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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 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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A method for anonymous communications over a wide area network such as the Internet.
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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 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 framework of universal composability (UC) is a general-purpose model for the analysis of cryptographic protocols.
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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 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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a 64-bit block cipher developed by the U.S. National Security Agency (NSA).
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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 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 breaking a stream of text up into words, phrases, symbols, or other meaningful elements called tokens.
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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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Encryption of data represented in XML according to the W3C Specification.
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a technology that allows telephone calls to be made over computer networks like the Internet.