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 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.
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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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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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secret keys which human beings can memorize.
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…
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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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Performance defines the abilities of a cipher in terms of processing throughput on various platforms, including its memory requirements.
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A way, esp. one of several possible variations, in which a set or number of things can be ordered or arranged.
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The OpenPGP encrypted data format (RFC 4880), and its implementations PGP and GnuPG.
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A PIR (Private Information Retrieval) protocol allows a user to retrieve an item from a server in possession of a database without revealing which item is retrieved.
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PKCS #11 (Public-Key Cryptography Standard 11) defines a platform-independent API to cryptographic tokens, such as hardware security modules (HSM) and smart cards called *Cryptoki*.
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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short for Public Key Infrastructure. The foundation of a PKI is the certificate authority (CA), which issues digital certificates that authenticate the identity of organizations and individuals…
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Plausible deniability may refer $1)$ to deniable encryption schemes allowing to decrypt a ciphertext for a message $m$ to some distinct message $m'$ or $2)$ to a feature provided by deniable file syst…
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a digraph substitution cipher. It employs a table where one letter of the alphabet is omitted, and the letters are arranged in a 5x5 grid.
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a symmetric cipher. In number theory, the Pohlig–Hellman algorithm sometimes is a special-purpose algorithm for computing discrete logarithms in a multiplicative gro…
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a cryptographic message authentication code (MAC) written by Daniel J. Bernstein. It can be used to verify the data integrity and the authenticity of a message.
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Cryptography that will remain secure should large-scale quantum computing become feasible. Based on hard problems with no known polynomial-time quantum algorithm (e.g., Shor's algorithm).
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an encryption paradigm which gives a master secret key owner fine-grained control over access to encrypted data.
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Difficulty of finding an input string that hashes to a given value
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Pseudo-Random Generator
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an integer greater than 1 with no divisors other than itself and 1. Primes and prime products play an important role in public key cryptography.