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 security property wherein past messages are protected against future compromise of the master keys.
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a type of public-key encryption, where the party that has access to a secret key can learn a function from that key, which is used to encrypt and decrypt messages.
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Calculating the value of a function for given inputs, especially, in the context of secure multi-party computation and/or homomorphic encryption, without disclosing the inputs to some or all parties c…
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The Galois Counter Mode, an authenticated encryption mode of operation for a block cipher.
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an abstract algebraic concept based on a set and a group law (a binary function which closes the set).
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 function which takes a variable size input and produces a fixed size output. The algorithm makes it difficult to predict the output for a given input, find two inpu…
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Hash-based digital signatures, such as Lamport one-time signatures, are digital signature schemes based on a (non-trapdoor) one-way function such as a cryptographic hash. Such schemes are expected to …
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a method of hierarchically hashing data. They allow efficient parallel hashing and updates and the possibility of verifying partial data.
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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 (+ and * at the same time).
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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definition used in cryptography to describe: indistinguishability under (non-adaptive) chosen ciphertext attack (IND-CCA1), and indistinguishability under adaptive chosen ciphertext attack …
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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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