GB1172971A

GB1172971A – Secrecy Communication System
– Google Patents

GB1172971A – Secrecy Communication System
– Google Patents
Secrecy Communication System

Info

Publication number
GB1172971A

GB1172971A
GB2069762A
GB2069762A
GB1172971A
GB 1172971 A
GB1172971 A
GB 1172971A
GB 2069762 A
GB2069762 A
GB 2069762A
GB 2069762 A
GB2069762 A
GB 2069762A
GB 1172971 A
GB1172971 A
GB 1172971A
Authority
GB
United Kingdom
Prior art keywords
counters
zero
gates
gate
sub
Prior art date
1961-05-31
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.)

Expired

Application number
GB2069762A
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.)

Nederlandse Organisatie voor Toegepast Natuurwetenschappelijk Onderzoek TNO

Original Assignee
Nederlandse Organisatie voor Toegepast Natuurwetenschappelijk Onderzoek TNO
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.)
1961-05-31
Filing date
1962-05-29
Publication date
1969-12-03

1962-05-29
Application filed by Nederlandse Organisatie voor Toegepast Natuurwetenschappelijk Onderzoek TNO
filed
Critical
Nederlandse Organisatie voor Toegepast Natuurwetenschappelijk Onderzoek TNO

1969-12-03
Publication of GB1172971A
publication
Critical
patent/GB1172971A/en

Status
Expired
legal-status
Critical
Current

Links

Espacenet

Global Dossier

Discuss

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

H04L9/065—Encryption by serially and continuously modifying data stream elements, e.g. stream cipher systems, RC4, SEAL or A5/3

H04L9/0656—Pseudorandom key sequence combined element-for-element with data sequence, e.g. one-time-pad [OTP] or Vernam’s cipher

H04L9/0662—Pseudorandom key sequence combined element-for-element with data sequence, e.g. one-time-pad [OTP] or Vernam’s cipher with particular pseudorandom sequence generator

Abstract

1,172,971. Secret telegraphy. NETHERLANDS, APPLIED SCIENTIFIC RESEARCH FOR STATE DEFENCE. 29 May, 1962 [31 May, 1961], No. 20697/62. Heading H4P. [Also in Division G4] A secrecy communication system operating with binary coding in which a plain message is enciphered by an interference pattern of finite length, which is determined by a number of subpatterns all of which have different numbers of elements, each sub-pattern being produced by an electronic circuit, is characterized in that for each of the sub-patterns means are provided to put the sub-pattern in a predetermined (zero) position at the occurrence of a certain determined group of elements in the enciphered message. The interference pattern may be generated by three electronic counters which count cylically in binary form up to 8, 11 and 13 respectively. Fig. 2 shows the counter which counts up to 8 and which comprises three triggers 1-3 operated through gates 12, 13 by clock pulses on line 11. The outputs XX1, YY1, ZZ1 of the triggers are connected as shown to the eight AND gates 5 which therefore produce outputs sequentially. The gates 5 are each connected to one side of a switch 6, the other side of which is connected through OR gate 7 to the output F 8 and the inverting circuit 8 which produces the inverted output F1 8 . The switches 6 are set to produce a desired sequence of ones and zeros in the sub-pattern. The other two counters are similar except that they contain four triggers with provision for re-setting to zero after reaching ten and twelve respectively. Their direct and inverted outputs F 11 , F1 11 , F 13 , F1 13 with F 8 and F1 8 are taken to four AND gates, each of which has three inputs, the outputs of which are fed to an OR gate, Fig. 5 (not shown). This effects addition without carry of the three numbers F 8 , F 11 and F 13 to produce the final output F. Provision is made for re-setting the counters to zero on receipt of predetermined cypher signals. Using a seven digit code, namely start and stop pulses and five code pulses which are fed into a seven-stage register, it may be arranged that the counters are re-set when a start pulse is in the first stage of the register and when the second to the fifth code pulses have predetermined values. Signals representative of the start pulse and the second and third code pulses are fed to a three input AND gate which produces an output a when they have the predetermined values. The direct and inverted values d, d1, e, e1 of the fourth and fifth code pulses are used together with a to re-set the counters to zero; thus in Fig. 2 the signals a, d1 and e1 operate a three-input AND gate 14 and re-set the counter to zero, whereas for the other two counters the combinations a, d1, e and a, d, e1 are used. This gives a re-setting probability of 1/ 16 for each counter so that if for any reason the counters at the transmitter and receiver are, out of step they will soon be restored to synchronism.

GB2069762A
1961-05-31
1962-05-29
Secrecy Communication System

Expired

GB1172971A
(en)

Applications Claiming Priority (1)

Application Number
Priority Date
Filing Date
Title

NL265358

1961-05-31

Publications (1)

Publication Number
Publication Date

GB1172971A
true

GB1172971A
(en)

1969-12-03

Family
ID=19753069
Family Applications (1)

Application Number
Title
Priority Date
Filing Date

GB2069762A
Expired

GB1172971A
(en)

1961-05-31
1962-05-29
Secrecy Communication System

Country Status (6)

Country
Link

BE
(1)

BE618271A
(en)

DE
(1)

DE977777C
(en)

DK
(1)

DK108615C
(en)

GB
(1)

GB1172971A
(en)

NL
(2)

NL265358A
(en)

NO
(1)

NO113572C
(en)

Family Cites Families (1)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

DE1076733B
(en)

*

1958-05-29
1960-03-03
Telefunken Gmbh

Arrangement to ensure the synchronous operation of the key-character generators on the sending and receiving side during the secret transmission of coded message signals

0

NL
NL107306D
patent/NL107306C/xx
active

NL
NL265358D
patent/NL265358A/xx
unknown

1962

1962-05-29
GB
GB2069762A
patent/GB1172971A/en
not_active
Expired

1962-05-29
BE
BE618271A
patent/BE618271A/en
unknown

1962-05-30
NO
NO14457562A
patent/NO113572C/en
unknown

1962-05-31
DE
DEN21642A
patent/DE977777C/en
not_active
Expired

1962-06-01
DK
DK246362A
patent/DK108615C/en
active

Also Published As

Publication number
Publication date

NL107306C
(en)

BE618271A
(en)

1969-09-18

NO113572C
(en)

1970-02-13

DK108615C
(en)

1968-01-08

NL265358A
(en)

DE977777C
(en)

1970-03-26

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Legal Events

Date
Code
Title
Description

1970-08-05
CSNS
Application of which complete specification have been accepted and published, but patent is not sealed

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