Bit stream producing device for data stream encrypting and/or decrypting device, has decimation units that permit bits produced by linear feedback shift registers, to pass through combiner which combines bits to produce bit stream

摘要

The device has linear feedback shift registers (112a-112d) producing a sequence of bits. Decimation units (118a-118d) permit the bits to pass through a combiner (116) that combines the bits to produce a bit stream at its output. The decimation units use their proper decimation values that are adjusted by a control unit (120) using a decimation vector. Independent claims are also included for the following: (A) a data stream encrypting device (B) a data stream decrypting device (C) a method of producing a bit stream (D) a computer program including a program code for producing a bit stream.