Method and apparatus for autokey rotor encryption

Details Method and apparatus for autokey rotor encryption Method and apparatus for autokey rotor encryption

Category

H - Electricity

Subcategory

04

Subsubcategory

L

IPC codes

H04L 9/28 (2006.01) H04L 9/06 (2006.01)

Type

Patent

Patent number

CA 2183021

Description

A method an apparatus for block or stream encrypting text uses an autokeyed rotational state vector to encrypt plain text to yield cipher text. The text is stored as a block in a buffer of an arbitrary number of bytes. Each byte of plain text in the buffer encrypted to yield a byte of cipher text by using a rotational state vector, and the rotational state vector is updated or changed as a function of one or more of: the cipher text, the plain text and a key. The encryption operation is advantageously a series of alternating non-linear and linear transformations. The method of encryption is advantageously involutory in that the encryption method and apparatus for a given key is identical to the decryption method and apparatus with the same key.

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