# disk cipher

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**Disk encryption theory**— Disk encryption is a special case of data at rest protection when the storage media is a sector addressable device (e.g., a hard disk). This article presents cryptographic aspects of the problem. For discussion of different software packages and… … Wikipedia**Cipher disk**— The Union Cipher Disk from the American Civil War was 3.75 inches (95 mm) in diameter and made of light yellow heavy card stock. It consisted of two concentric disks of unequal size revolving on a central pivot. The disks were divided along their … Wikipedia**Disk encryption software**— To protect confidentiality of the data stored on a computer disk a computer security technique called disk encryption is used. This article discusses software that is used to implement the technique (for cryptographic aspects of the problem see… … Wikipedia**cipher**— cipherable, adj. cipherer, n. /suy feuhr/, n. 1. zero. 2. any of the Arabic numerals or figures. 3. Arabic numerical notation collectively. 4. something of no value or importance. 5. a person of no influence; nonentity. 6. a secret method of… … Universalium**cipher disk**— noun or cipher wheel : a device for enciphering and deciphering in substitution cipher consisting of two movable concentric disks with the letters of the alphabet written around the margin of each … Useful english dictionary**cipher wheel**— noun see cipher disk … Useful english dictionary**National Cipher Challenge**— The National Cipher Challenge is an annual cryptographic competition organised by the University of Southampton School of Mathematics. Competitors attempt to break cryptograms published on the competition website. In the 2007/08 challenge, 1301… … Wikipedia**Alberti cipher**— The Alberti Cipher was one of the first polyalphabetic ciphers. Leon Battista Alberti Created in the 15th century (1466/67) by Leon Battista Alberti, it was the peak of cryptography at that time.Its inventor was Leon Battista Alberti, an… … Wikipedia**Polyalphabetic cipher**— A polyalphabetic cipher is any cipher based on substitution, using multiple substitution alphabets. The Vigenère cipher is probably the best known example of a polyalphabetic cipher, though it is a simplified special case. The Enigma machine is… … Wikipedia**Alberti cipher disk**— The Alberti cipher disk, also called formula, is a cipher disc which was described by Leon Battista Alberti in his treatise De Cifris of 1467. The device embodies the first example of polyalphabetic substitution with mixed alphabets and variable… … Wikipedia