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



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.


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

Patent Number
  • EP 0482154B1

Inventor From Local Institution
  • James L. Massey

Other Application
  • EP19910908542 19910516

  • 17

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

  • German

  • English

  • French

Date Issued
  • 1993-06-30

  • European Patent Office

  • Ascom Tech AG

Record Visibility Public
Content License
  • All rights reserved

Departments and Units
Member of


Collections Featuring this Patent
James L. Massey Memorial Collection


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