FACTOID #151: The five countries with the highest coffee consumption are also the five countries whose citizens trust one another the most. Coincidence? Probably.
The Cryptomeria cipher, commonly refered to as C2 is a proprietaryblock cipher defined and licensed by the 4C Entity. It is used in the digital rights management schemes named Content Protection for Recordable Media and Content Protection for Prerecorded Media (CPRM/CPPM) which is used by the DRM parts of Secure Digital cards and DVD-Audio. Proprietary indicates that a party exercises private ownership, control or use over an item of property, usually to the exclusion of other parties. ... In cryptography, a block cipher is a symmetric key cipher which operates on fixed-length groups of bits, termed blocks, with an unvarying transformation. ... The 4C Entity (which should be read out as the four company entity) is a consortium formed by IBM, Intel, Matsushita and Toshiba to establish a common platform for digital rights management schemes. ... Digital rights management (DRM) is the umbrella term referring to any of several technical methods used to handle the description, layering, analysis, valuation, trading and monitoring of the rights held over a digital work. ... CPRM or Content Protection for Recordable Media is a mechanism for controlling the copying, moving and deletion of digital media on a host device, such as a personal computer, or other digital player. ... CPRM or Content Protection for Recordable Media is a mechanism for controlling the copying, moving and deletion of digital media on a host device, such as a personal computer, or other digital player. ... 16 MB SD Card 512 MB SD Card 1 GB SD Card Secure Digital (SD) is a flash memory memory card format. ... The Flaming Lips CD and DVD release of Yoshimi Battles the Pink Robots, one of the first major albums to employ the DVD-Audio format DVD-Audio is a format for delivering high-fidelity audio content on a DVD. It offers many channels (from mono to 5. ...
The C2 symmetric key algorithm is a 10-round Feistel cipher. It has a key size of 56 bits and a block size of 64 bits. The encryption and decryption algorithms are available for peer review, but implementations require the "secret constant" (Substitution box) values which are only available under a license from the 4C Entity. Symmetric-key algorithms are a class of algorithms for cryptography that use trivially related cryptographic keys for both decryption and encryption. ... Feistel cipher - Wikipedia /**/ @import /skins-1. ... In cryptography, the key size (alternatively key length) is a measure of the number of possible keys which can be used in a cipher. ... In modern cryptography, symmetric key ciphers are generally divided into stream ciphers and block ciphers. ... In cryptography, a substitution box (or S-box) is a basic component of symmetric key algorithms. ...
The two main categories are transposition ciphers, which rearrange the order of letters in a message, and substitution ciphers, which systematically replace groups of letters with others.
Classical ciphers tend to leak varying amounts of information about the statistics of the plaintext, and because of this they are easily broken, for example by frequency analysis.
Stream ciphers encrypt one bit at a time, in contrast to a block cipher, which operates on a group of bits (a "block") of a certain length all in one go.
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