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Needham–Schroeder refers to both, a symmetric key or a public key authentication protocol.
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so unimportant, that it isn't worth considering. For example, if a flaw in a cryptographic algorithm is considered to be negligible, it is insignificant to both the …
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a variation of the McEliece Cryptosystem and is equivalent to McEliece from a security point of view, but encryption using Niederreiter is about ten times faster than …
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The National Institute of Standards and Technology (NIST) is a U.S. federal agency that works with industry to develop and apply technology, measurements, and standards.
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an arbitrary number or string used only once within the context of a specific cryptographic scheme. Nonces are used e.g. in authentication protocols to prevent replay attacks, as well as …
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the assurance that someone cannot deny something.
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Questions on the meaning, history, and usage of symbols and notation in cryptography. Please remember to mention where (book, paper, webpage, etc.) you encountered any notation you are asking about.
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the central producer and manager of signals intelligence for the United States Government.
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an encryption algorithm which is based on the shortest vector problem in a lattice.
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the study of the properties and construction of numbers, particularly integers. Prime numbers are of particular interest to number theorists and consequently cryptographers as they ar…
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a padding scheme which has been standardized in [PKCS #1v29](http://www.emc.com/collateral/white-papers/h11300-pkcs-1v2-2-rsa-cryptography-standard-wp.pdf) and…
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a useful primitive that allows a client to hide its data access patterns from an untrusted server in storage outsourcing applications.
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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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The Offset CodeBook Mode, an authenticated encryption mode of operation for a block cipher.
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an encryption mode, that builds a synchronous stream-cipher from a block-cipher.
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A cipher which uses a different encryption key every time, as long as the message. The key is XOR'ed with the message to render the cipher text which can then be XOR'ed with the same key to get the p…
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a password that is valid for only one session or transaction.
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easy to compute but hard to invert (i.e. find preimages for). The existence of one-way functions implies the possibility of many useful cryptographic schemes. No one-way functions …
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A method for anonymous communications over a wide area network such as the Internet.
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an open source implementation of the SSL and TLS protocols. Questions about how to use the OpenSSL tools and libraries are usually better asked at Stack Overflow or Super User.
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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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a set of public key cryptography standards provided by the IEEE.
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Padding has two primary uses in cryptography, ensuring messages are the proper length necessary for certain ciphers (e.g., block ciphers) or to provide assurances not built into the core cipher (e.g.,…
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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 public-key cryptosystem invented by Pascal Paillier in 1999.
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Pairing-based cryptography uses bilinear maps to create a gap group that allows efficient constructions of certain primitives.
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Encryption using a key derived from a password or passphrase entered by the user.
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Irreversibly converting user-selected passwords into authentication tokens that can be safely stored e.g. in a user database. Typically done with a salted password-based key derivation function (PBKDF…
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secret keys which human beings can memorize.
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a Password Based Key Derivation Function, which can be used to derive key data or derive a "password hash" from a salt and password.
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The Password-Based Key Derivation Function 2 (PBKDF2) is a method of securely deriving encryption keys from a passphrase entered by a user. It features an iteration count that can be deliberately adju…
the art and science of teaching, that is transmitting knowledge. On this website, only the pedagogy of teaching cryptography could possibly be on-topic.