Search results
Results from the WOW.Com Content Network
Hill's cipher machine, from figure 4 of the patent. In classical cryptography, the Hill cipher is a polygraphic substitution cipher based on linear algebra.Invented by Lester S. Hill in 1929, it was the first polygraphic cipher in which it was practical (though barely) to operate on more than three symbols at once.
In 1929, Lester S. Hill developed the Hill cipher, which uses matrix algebra to encrypt blocks of any desired length. However, encryption is very difficult to perform by hand for any sufficiently large block size, although it has been implemented by machine or computer. This is therefore on the frontier between classical and modern cryptography.
Consider a block cipher with a unicity distance of three ciphertext blocks. Although there is clearly enough information for a computationally unbounded adversary to find the right key (simple exhaustive search), this may be computationally infeasible in practice. The unicity distance can be increased by reducing the plaintext redundancy.
This technique is used to cryptanalyze the Vigenère cipher, for example. For a repeating-key polyalphabetic cipher arranged into a matrix, the coincidence rate within each column will usually be highest when the width of the matrix is a multiple of the key length, and this fact can be used to determine the key length, which is the first step ...
Learn how to download and install or uninstall the Desktop Gold software and if your computer meets the system requirements.
CMEA – cipher used in US cellphones, found to have weaknesses. CS-Cipher – 64-bit block; Data Encryption Standard (DES) – 64-bit block; FIPS 46-3, 1976; DEAL – an AES candidate derived from DES; DES-X – a variant of DES to increase the key size. FEAL; GDES – a DES variant designed to speed up encryption; Grand Cru – 128-bit block
Exactly 10 years ago today, I published a commentary defending the decision to publish the contents of the Sony hack in Variety, the publication where I then served as co-editor-in-chief. Listen ...
between 2008 and 2012, better performance than 10% of all directors The Robert A. Profusek Stock Index From January 2008 to December 2012, if you bought shares in companies when Robert A. Profusek joined the board, and sold them when he left, you would have a -51.4 percent return on your investment, compared to a -2.8 percent return from the S ...