BS 7112:1991

Withdrawn

Procedures for achievement of interoperability and security by use of encipherment at the physical layer of OSI in telecommunication systems conveying automatic data processing information

Available format(s)

Hardcopy , PDF

Withdrawn date

10-31-2015

Language(s)

English

Published date

05-31-1991

Publisher

British Standards Institution

Committees responsible
National foreword
Method
0. Introduction
1. Scope and field of application
2. References
3. Definitions
4. Applicable interfaces
5. General requirements
6. Synchronous encipherment operation
7. Asynchronous encipherment operation
8. Bypass control facility (Optional)
Annexes
A. Background Information on Encipherment in the
    Physical Layer
B. Requirements for IV Structure and Transmission for
    DEAP
Tables
1. IV Derivation
2. IV Option 1
3. IV Option 2
Figures
1. Operation of the V.24 Interchange circuits showing
    data encipherment in one direction only
2. V.24 Half Duplex Transmission Signalling Sequence
    for Synchronous Encipherment, Alternative A
3. V.24 Half Duplex Transmission Signalling Sequence
    for Synchronous Encipherment, Alternative B
4. Start of asynchronous encipherment and a Class A
    BREAK operation
5. Class B BREAK operation
6. Bypass of encipherment for Test Loop Operation
7. SV Derivation from 49-bit IV, 7-bit Characters,
    Preferred Alternative
8. SV Derivation from 63-bit IV, 7-bit Characters,
    Acceptable Alternative 1
9. SV Derivation from 70-bit IV, 7-bit Characters,
    Acceptable Alternative 2

Applies to systems for encipherment of ADP information in the physical layer of data communications. Applicable whether the Data Encipherment Equipment is implemented as a physically separate piece of equipment or implemented as part of the Data Terminal Equipment or as part of the Data Circuit terminating Equipment. Applies to those portions of the DTE or DCE design which implement the requirements of this Standard. The physical layer is described in the Open Systems Interconnection Reference Model, ISO 7498. The main body specifies requirements applicable to the use of various encipherment algorithms. Specifies two alternative modes of synchronous operation. Gives two alternative actions for BREAK signalling for asynchronous operation.

Committee	IST/6
DevelopmentNote	Also numbered as ISO 9160 Inactive for the new design. Supersedes 87/98227 DC (03/2004)
DocumentType	Standard
Pages	22
PublisherName	British Standards Institution
Status	Withdrawn

BS 7111:1991	Guide to modes of operation for a 64-bit block cipher algorithm
BS ISO/IEC 7498/2 : 1989	INFORMATION PROCESSING SYSTEMS - OPEN SYSTEMS INTERCONNECTION - BASIC REFERENCE MODEL - SECURITY ARCHITECTURE
BS ISO 2382-9:1984	Information technology. Vocabulary Data communication