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 historic polygraphic substitution cipher invented by Lester S. Hill in 1929.
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for questions about cryptographic algorithms which were invented (and used) before the computer age.
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History of cryptography and cryptanalysis. Questions that wish to ask about the history of cryptography should use this tag; if you're asking about historical ciphers you may also wish to use the clas…
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a key derivation function specified in RFC5869.
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a method for constructing a message authentication code based on a cryptographic hash function.
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Cryptosystems which support computation on encrypted data. They might be partially homomorphic (support for one operation such as + or *) or they might be fully homomorphic (any sequence of + and *).
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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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"host-proof" means that no unencrypted or insecure data is stored on the server or passed over the network.
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The HMAC-based one-time password algorithm defined in RFC 4226.
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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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In identity-based encryption (IBE) the public key of a user $A$ is some identity string $ID_A$, e.g., an email address. To encrypt a message for this user there is no need to retrieve an authentic cop…
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the process of taking it from its mathematical or algorithmic description and producing a working version, often in computer software or hardware. This tag should …
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a measure of the relative frequency of letters in a cipher text sample, which facilitates cryptanalysis of poly-alphabetic ciphers by allowing determination of the per…
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concerned with sending messages via electronic signals in the most efficient and error-free way.
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Random data used by block cipher modes of operation to randomize the output in order to achieve semantic security. Also for other similar constructs in other iterative algorithms.
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In a cryptographic sense, integrity means unimpaired and complete.
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an object-oriented programming language. Java programs are compiled to bytecode and run in a virtual machine (JVM). Java should not be confused with JavaScript; JavaScript is an entirely diff…
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a dynamic, object-oriented, prototype-based, weakly typed language commonly used for scripting in web browsers. Despite the name, it is unrelated to the Java programming language and sha…
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a key derivation function ([tag:kdf]) that uses a key in the computation.
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a cryptographic hash function designed by Guido Bertoni, Joan Daemen, Michaël Peeters, and Gilles Van Assche.
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In cryptography, a key derivation function (or KDF) derives one or more secret keys from a secret value such as a master key or other known information such as a password or passphrase using a pseudo-…
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Key exchange protocols allow two parties to produce a secret session key over a public channel.
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the process of generating keys for cryptographic purposes.
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A means of recovering cryptographic keys when the usual means for obtaining them is unavailable.; the ability to uncover the secret key to a cryptographic message.
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Using the same key for more than one purpose, e.g. to encrypt two messages or to encrypt and authenticate a message. Some cryptosystems may be vulnerable to attacks if keys are inappropriately reused.