FR2301873A1 - Block cipher system for data security - with result of one product block cipher iteration serving as argument of next iteration - Google Patents

Block cipher system for data security - with result of one product block cipher iteration serving as argument of next iteration

Info

Publication number
FR2301873A1
FR2301873A1 FR7601482A FR7601482A FR2301873A1 FR 2301873 A1 FR2301873 A1 FR 2301873A1 FR 7601482 A FR7601482 A FR 7601482A FR 7601482 A FR7601482 A FR 7601482A FR 2301873 A1 FR2301873 A1 FR 2301873A1
Authority
FR
France
Prior art keywords
block cipher
iteration
message block
data bits
bits
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
FR7601482A
Other languages
French (fr)
Other versions
FR2301873B1 (en
Inventor
William
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
International Business Machines Corp
Original Assignee
International Business Machines Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US05/552,684 external-priority patent/US3962539A/en
Priority claimed from US05/552,685 external-priority patent/US3958081A/en
Application filed by International Business Machines Corp filed Critical International Business Machines Corp
Publication of FR2301873A1 publication Critical patent/FR2301873A1/en
Application granted granted Critical
Publication of FR2301873B1 publication Critical patent/FR2301873B1/fr
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/06—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols the encryption apparatus using shift registers or memories for block-wise or stream coding, e.g. DES systems or RC4; Hash functions; Pseudorandom sequence generators
    • H04L9/0618—Block ciphers, i.e. encrypting groups of characters of a plain text message using fixed encryption transformation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L2209/00—Additional information or applications relating to cryptographic mechanisms or cryptographic arrangements for secret or secure communication H04L9/00
    • H04L2209/24—Key scheduling, i.e. generating round keys or sub-keys for block encryption

Abstract

The cipher device performs an enciphering process for each message block of data by carrying out a predetermined number of iteration operations, in the first of which a first half of the message block of data bits is first expanded by duplicating predetermined data bits. The data bits of the expanded message block are combined by modulo-2 addition with an equal number of cipher key bits, selected in accordance with an arbitrary but fixed permutation, to produce multi-bit segments forming the arguments for different nonlinear substitution function boxes. The substitution boxes perform nonlinear transformation functions to produce a substitution set of bits which are equal in number to the number of data bits in the first half of the message block.
FR7601482A 1975-02-24 1976-01-14 Block cipher system for data security - with result of one product block cipher iteration serving as argument of next iteration Granted FR2301873A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US05/552,684 US3962539A (en) 1975-02-24 1975-02-24 Product block cipher system for data security
US05/552,685 US3958081A (en) 1975-02-24 1975-02-24 Block cipher system for data security

Publications (2)

Publication Number Publication Date
FR2301873A1 true FR2301873A1 (en) 1976-09-17
FR2301873B1 FR2301873B1 (en) 1978-11-10

Family

ID=27070100

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7601482A Granted FR2301873A1 (en) 1975-02-24 1976-01-14 Block cipher system for data security - with result of one product block cipher iteration serving as argument of next iteration

Country Status (1)

Country Link
FR (1) FR2301873A1 (en)

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
NEANT *

Also Published As

Publication number Publication date
DE2558206B2 (en) 1977-04-21
FR2301873B1 (en) 1978-11-10
DE2558206A1 (en) 1976-09-09

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