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 key derivation function specified in RFC5869.
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The term "pen and paper" can practically be interpreted as "using no tools like electronic devices", since it targets cryptographic functions, schemes, and procedures which can be handled by humans wh…
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Oblivious transfer refers to a cryptographic protocol in which a sender possesses a set of data and a receiver queries the sender for a particular member of that set in such a way that the sender does…
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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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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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the art and science of writing hidden messages in such a way that no one, apart from the sender and intended recipient, suspects the existence of the message. While cryptography prot…
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the art of chopping a secret into little bits, so that the secret can only be learned by possessing more than a threshold number of those bits.
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Disk encryption protects information by encrypting every byte that is written to a HD or virtual disk volume.
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A backdoor in a cryptosystem or algorithm allows someone to obtain access to the decrypted data, without the need for the key/password that was used to encrypt the data.
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a type of public-key encryption in which the key used for encryption is based on selected attributes of the readers. Decryption of the ciphertext is possible only if the …
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the process of generating keys for cryptographic purposes.
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said to be malleable if it is feasible to modify ciphertext to produce meaningful changes in the corresponding plaintext without knowing the encryption key.
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a known plaintext attack and uses a linear approximation to describe the behavior of the block cipher. Given sufficient pairs of plaintext and corresponding ciphertext, bits of…
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A side-channel attack on implementations of encryption modes that use padding (e.g. ECB, CBC) that uses information leaked during decryption of tampered ciphertext values to derive information about t…
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A symmetric block cipher algorithm with a 128 bit block size, and key sizes up to 256 bits.
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A digital signature algorithm based on the discrete logarithm problem, provably secure in the random oracle model.
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based on recording an encrypted and/or signed communication and replaying it at a later time.
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Quantum cryptography describes the use of quantum mechanical effects to perform cryptographic tasks or to break cryptographic systems.
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A public-key cryptosystem based on squaring modulo the product of two primes, introduced in 1979 by Michael O. Rabin and proven to have security reducible to the hardness of integer factorization.
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A length extension attack on a hash or message authentication code function, which allows extra information to be added to the input message without changing the output value.
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an asymmetric encryption algorithm and is a candidate for "post-quantum cryptography", as it is immune to attacks using Shor's algorithm and — more generally — measuring coset…
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the central producer and manager of signals intelligence for the United States Government.
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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 method of cryptanalysis against a cipher 1)expressing the cipher operations as a system of equations. 2)substituting in known data for some of the variables. 3)sol…
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The Merkle–Damgård construction — used in the design of many popular hash algorithms such as MD5, SHA1 and SHA2 — is a method of building collision-resistant cryptographic hash functions from collisio…
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a construction scheme for hash functions (and other symmetric primitives) based on an unkeyed permutation. The most famous example is Keccak, which won the SHA-3 competitio…
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the current time of an event that is recorded by a computer. You can use digital timestamps via a trusted authority to certify and protect your intellectual property or your …
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a set of inputs used to test new and/or established cryptographic designs and/or implementations.
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The HMAC-based one-time password algorithm defined in RFC 4226.
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an encryption mode, that builds a synchronous stream-cipher from a block-cipher.
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non-cryptographic error-detecting code commonly used to detect accidental changes to raw data.
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the process of making, adapting, or imitating objects, statistics, or documents with the intent to deceive.
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a cryptosystem which always produces the same ciphertext for a given plaintext and key, even over separate executions of the encryption algorithm.
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a type of cryptography that allows an encrypted text to be decrypted in two or more ways, depending on which decryption key is used.
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any form of cryptanalysis on data encrypted by a cipher that allows an attacker to distinguish the encrypted data from random data.
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a family of protocols in which one party presents a question ("challenge") and another party must provide a valid answer ("response") to be authenticated.