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In cryptography, format-preserving encryption (FPE), refers to encrypting in such a way that the output (the ciphertext) is in the same format as the input (the plaintext). The meaning of "format" varies.
Knowledge Engineering Environment (KEE) is a frame-based development tool for expert systems. [1] It was developed and sold by IntelliCorp, and was first released in 1983.It ran on Lisp machines, and was later ported to Lucid Common Lisp with the CLX library, an X Window System (X11) interface for Common Lisp.
The format of a STEP-file is defined in ISO 10303-21 Clear Text Encoding of the Exchange Structure. [2] ISO 10303-21 defines the encoding mechanism for representing data conforming to a particular schema in the EXPRESS data modeling language specified in ISO 10303-11. A STEP-File is also called p21-File and STEP Physical File.
In the case of the FFX FPE standardized by NIST, it includes an input called a 'tweak' which fulfils the same general principles as a salt. Choosing an appropriate tweak and managing it effectively is an important facet to use FPE safely. See: [1] — Preceding unsigned comment added by 167.24.104.150 21:57, 4 August 2016 (UTC)
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STM – format used by The Powder Toy, Powder Toy stamp; PKG – format used by Bungie for the PC Beta of Destiny 2, for nearly all the game's assets. CHR – format used by Team Salvato, for the character files of Doki Doki Literature Club! Z5 – format used by Z-machine for story files in interactive fiction.
The PEM format was first developed in the privacy-enhanced mail series of RFCs: RFC 1421, RFC 1422, RFC 1423, and RFC 1424. These standards assumed prior deployment of a hierarchical public key infrastructure (PKI) with a single root. Such a PKI was never deployed, due to operational cost and legal liability concerns.
In KeePass 1.x (KDB database format), the integrity of the data is checked using a SHA-256 hash of the plaintext, whereas in KeePass 2.x (KDBX database format), the authenticity of the data is ensured using a HMAC-SHA-256 hash of the ciphertext (Encrypt-then-MAC construction).