block field — A thin accumulation of stone blocks, typically angular, with only rock fragments in the upper part, over solid or weathered bedrock, colluvium, or alluvium, without a cliff or ledge above as an apparent source. Block fields occur on high… … Glossary of landform and geologic terms
Stream cipher — The operation of the keystream generator in A5/1, a LFSR based stream cipher used to encrypt mobile phone conversations. In cryptography, a stream cipher is a symmetric key cipher where plaintext digits are combined with a pseudorandom cipher… … Wikipedia
Block cipher modes of operation — This article is about cryptography. For method of operating , see modus operandi. In cryptography, modes of operation is the procedure of enabling the repeated and secure use of a block cipher under a single key.[1][2] A block cipher by itself… … Wikipedia
Block cipher — In cryptography, a block cipher is a symmetric key cipher operating on fixed length groups of bits, called blocks, with an unvarying transformation. A block cipher encryption algorithm might take (for example) a 128 bit block of plaintext as… … Wikipedia
block — [[t]blɒ̱k[/t]] ♦♦ blocks, blocking, blocked 1) N COUNT: usu with supp, oft N of n A block of flats or offices is a large building containing them. ...blocks of council flats. ...a white painted apartment block. 2) N COUNT A block in a town is an… … English dictionary
Block (data storage) — In computing (specifically data transmission and data storage), block is a sequence of bytes or bits, having a nominal length (a block size ). Data thus structured is said to be blocked . The process of putting data into blocks is called blocking … Wikipedia
Block size (cryptography) — In modern cryptography, symmetric key ciphers are generally divided into stream ciphers and block ciphers. Block ciphers operate on a fixed length string of bits. The length of this bit string is the block size. Both the input (plaintext) and… … Wikipedia
Block (meteorology) — An example of an omega block over western North America in May 2006 Blocks in meteorology are large scale patterns in the atmospheric pressure field that are nearly stationary, effectively blocking or redirecting migratory cyclones. They are also … Wikipedia
Block tin — Tin Tin, n. [As. tin; akin to D. tin, G. zinn, OHG. zin, Icel. & Dan. tin, Sw. tenn; of unknown origin.] 1. (Chem.) An elementary substance found as an oxide in the mineral cassiterite, and reduced as a soft silvery white crystalline metal, with… … The Collaborative International Dictionary of English
Stream tin — Tin Tin, n. [As. tin; akin to D. tin, G. zinn, OHG. zin, Icel. & Dan. tin, Sw. tenn; of unknown origin.] 1. (Chem.) An elementary substance found as an oxide in the mineral cassiterite, and reduced as a soft silvery white crystalline metal, with… … The Collaborative International Dictionary of English
