BS 7112:1991
Withdrawn
A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.
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
Hardcopy , PDF
31-10-2015
English
31-05-1991
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
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