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Secure/Multipurpose Internet Mail Extensions, or short S-MIME, is a standard for public key encryption and signing of MIME data.
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The three-pass protocol uses commutative encryption to let two people communicate privately without having to exchange keys in advance.
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a two-pass AEAD block cipher mode of operation described in RFC 5297. It can be used either for key-wrap (nonce-less deterministic authenticated encryption) or…
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a Crypto SDK was developed by Microsoft to support experimentation with the foundational features of the U-Prove technology. It is made available under the Apache 2.0 open-source license, w…
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The framework of universal composability (UC) is a general-purpose model for the analysis of cryptographic protocols.
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a technology that allows telephone calls to be made over computer networks like the Internet.
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Encryption of data represented in XML according to the W3C Specification.
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a 64-bit block cipher developed by the U.S. National Security Agency (NSA).
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A family of lightweight symmetric block-ciphers designed for good performance in constrained software devices with block sizes ranging from 32 to 128 bits and key sizes ranging from 64 to 256 bits.
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the most important hardware component of a computer system, since it contains the circuitry necessary to interpret and execute instructions.
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Questions related to the teaching and learning of cryptography.
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short-lived, like (for example) an ephemeral key, which is a key that only exists within the lifetime of a communication session.
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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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Public-Key Cryptography Standard, number 8, describes the Private-Key Information Syntax Standard which is used to carry (encrypted or unencrypted) private certificate keypairs. See [RFC 5208](http://…
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Remote data checking protocols allow a client that has stored data at an untrusted server to efficiently verify that the server possesses the original data without retrieving it.
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Key rotation refers to a schedule or process for changing the key material.
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The Miyaguchi-Preneel scheme, based on a one-way compression function, was proposed around 1989 by Preneel, and independently by Miyaguchi.Ohta, and Iwata.
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Let $\Omega$ be a set of entities. An *access structure* $\mathcal{A}$ is a collection of nonempty subsets of the power set $P(\mathcal{A})$. This structure is called *monotone*, if $A\in\mathcal{A}$ …
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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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RFC 1320 — the MD4 message-digest algorithm — is a cryptographic hash function with a digest length is 128 bits, developed by Ronald Rivest in 1990.
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 …
a useful primitive that allows a client to hide its data access patterns from an untrusted server in storage outsourcing applications.
RFC 1319 — The MD2 Message-Digest Algorithm is a cryptographic hash function which is no longer considered secure.
a 128-bit block cipher with variable key size of between 128 and 448 bits. It has a heterogeneous structure: several rounds of a cryptographic core are “jacketed” by un-keyed mixing rounds, to…
a 128-bit block cipher, formerly an AES candidate, that makes heavy use of data-dependent rotations.
a variant of RSA, meant to increase the RSA public modulus size while keeping computation cost moderate.
SHA-3 Competition (2007-2012) was a competition initiated by NIST as a call for a new cryptographic hash algorithm for standardization purposes.
a Password Based Key Derivation Function, which can be used to derive key data or derive a "password hash" from a salt and password.
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…
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…
an extension of DES that attempts to foil brute force attacks