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 sequence of bytes or bits, having a fixed length (the block-size).
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A security property wherein past messages are protected against future compromise of the master keys.
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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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Secure Remote Password protocol version 6.
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side channel attack based on the different speed at which certain operations are executed.
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a form of cryptanalysis which studies cryptographic algorithms by observing how differences in input affect differences on output.
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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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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 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 encryption algorithm which is based on the shortest vector problem in a lattice.
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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 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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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 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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Disk encryption protects information by encrypting every byte that is written to a HD or virtual disk volume.
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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 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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an authentication protocol (described in RFC 4252) for securely getting access to a remote computer.
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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 HMAC-based one-time password algorithm defined in RFC 4226.
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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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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 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 symmetric block cipher algorithm with a 128 bit block size, and key sizes up to 256 bits.
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an encryption mode, that builds a synchronous stream-cipher from a block-cipher.
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a method of encrypting data so that it's possible to make efficient inequality comparisons on the encrypted items without decrypting them.
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the process of making, adapting, or imitating objects, statistics, or documents with the intent to deceive.
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Secure remote password protocol
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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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A symmetric block-cipher algorithm with a 128-bit block size, and key sizes up to 256 bits.
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In cryptanalysis and computer security, a dictionary attack is a technique for defeating a cipher or authentication mechanism by trying to determine its decryption key or pass-phrase by trying hundred…
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non-cryptographic error-detecting code commonly used to detect accidental changes to raw 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.
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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…