Device for the conversion of a digital block and use of same 

Patent

Description

The device (12) comprises nine coding stages (61.1, 61.2, 69), the first eight of which are of identical construction. It also comprises a coding partial block generation unit (63), an input unit (21) and an output unit (79). It is used for the blockwise coding of a plain text (X) from an information source (11) into a coded text (Y) to be taken to a transmission line (13), whereby a secret code block (Z) is previously introduced via a secure channel (17). Coding takes place stepwise and in parallel for four partial blocks (X1 - X4; W11 - W14; W21 - W24; W81 - W84; Y1 - Y4) at a time. To this end, each coding stage (61.1, 61.2, 60) has four first inputs (25 - 28; 35 - 38), six or four second inputs (29, 30, 32, 33, 49, 52; 129, 130, 132, 133) and four outputs (75 - 78).; At the second inputs there are a total of fifty-two coding partial blocks (Z1 - Z52) formed from the code block (Z). The device (12) may also be used unchanged for decoding an incoming cipher text (Y). For this purpose it is merely necessary to apply other code partial blocks to the second inputs.

Attributes

Attribute NameValues
Title
  • Device for the conversion of a digital block and use of same 

Patent Number
  • EP 0482154B1

USPTO Link
Inventor
  • James L. Massey

  • Xuejia Lai

Inventor From Local Institution
  • James L. Massey

Other Application
  • EP19910908542 19910516

Claims
  • 17

International Patent Classification codes
  • G09C 1/00; H04L 9/06

Language
  • German

  • English

  • French

Date Issued
  • 1993-06-30

Publisher
  • European Patent Office

Assignee
  • Ascom Tech AG

Record Visibility and Access Public
Departments and Units
Member of

Collections

Collections Featuring this Patent
James L. Massey Memorial Collection

Files

Please Note: You may encounter a delay before a download begins. Large or infrequently accessed files can take several minutes to retrieve from our archival storage system.