US3749832A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Binary coded signal and ciphering and deciphering method and systems embodying same
Assignee: CO INTERN POUR L INF
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Filing: 1964-04-13
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Granted: 1973-07-31
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Expires: 1984-04-13
Abstract
Abstract For avoiding the transmission of coded servicing signals on a transmission path between transmitting and receiving ends of a binary coded ciphered signal syste, each ciphered signal is formed, at the transmitting end, by first ciphering, in the sequence of the plain alphabet signals, a number of successive intelligence periods lower than the lower number of such period in any plain signal, and thereafter completing said lower number of ciphered periods up to said normal number by adding at least one additional intervening arbitrary period distinguishing the thus built up signal from any servicing signal pattern in the system. The additional arbitrary periods are canceled at the receiving end and the uncanceled periods are regrouped for normal deciphering operations.
Inventors
- 👤 J Lemoine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:56
CPC Classifications
H; H04; H04L; H04L9/00; H04L9/36; H04L9/06; H04L9/0618; H04L9/0631; H04L2209/00; H04L2209/12; Y; Y04; Y04S; Y04S40/00; Y04S40/20
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
282 words
A method for enciphering and deciphering binary coded signal representations of the characters of a plain language alphabet where a first definite number of intelligence periods are employed for representing the characters of the plain language alphabet and where the said character signals are transmitted with servicing signals, the latter named signals being characterized by a presentation common to all such signals, the improved method dispensing with the servicing signals on a transmission path linking transmitting and receiving ends of a transmission system and comprising the steps of: grouping successive plain alphabet signals such that they may be enciphered in groups where each enciphered group comprises a second definite number of intelligence periods where said second definite number of periods is a submultiple of said first definite number of periods; sequentially enciphering said groups of plain alphabet signals in a manner so as to produce said enciphering groups; adding to each enciphered group a sufficient number of character identifying intelligence periods to bring the total number of intelligence periods in each said group up to said first definite number of periods and applying each so composed group to said transmission line; canceling the character identifying intelligence periods at the receiving end of said transmission line; deciphering the individual intelligence periods of said enciphered groups as they are received at the receiving end of the system such that they are reconstituted as intelligence periods of said plain language alphabet signals; and regrouping the thus reconstituted intelligence periods in sequence so as to reconstitute the groups of plain language alphabet signals formed at the transmitting end of the system and applying the thus reconstituted groups of plain language alphabet signals to an output device.
Claim 2
Independent Claim
282 words
A method for enciphering and deciphering binary coded signal representations of the characters of a plain language alphabet where a first definite number of intelligence periods are employed for representing the characters of the plain language alphabet and where the said character signals are transmitted with servicing signals, the latter named signals being characterized by a presentation common to all such signals, the improved method dispensing with the servicing signals on a transmission path linking transmitting and receiving ends of a transmission system and comprising the steps of: grouping successive plain alphabet signals such that they may be enciphered in groups where each enciphered group comprises a second definite number of intelligence periods where said second definite number of periods is a submultiple of said first definite number of periods; sequentially enciphering said groups of plain alphabet signals in a manner so as to produce said enciphering groups; adding to each enciphered group a sufficient number of character identifying intelligence periods to bring the total number of intelligence periods in each said group up to said first definite number of periods and applying each so composed group to said transmission line; canceling the character identifying intelligence periods at the receiving end of said transmission line; deciphering the individual intelligence periods of said enciphered groups as they are received at the receiving end of the system such that they are reconstituted as intelligence periods of said plain language alphabet signals; and regrouping the thus reconstituted intelligence periods in sequence so as to reconstitute the groups of plain language alphabet signals formed at the transmitting end of the system and applying the thus reconstituted groups of plain language alphabet signals to an output device.
Claim 3
Dependent Claim
238 words
Ciphering apparatus for use with a signal transmission system where the system includes a signal transmission end and a signal recepTion end and where signals to be transmitted are characterized as binary coded signals forming a plain language alphabet, each of the characters of said alphabet being comprised of a first definite number of signal intelligence periods, and as servicing signals, including input means for applying said binary coded signals to said system and to said apparatus; means operatively connected to said signal input means for sequentially enciphering said signals such that groups of enciphered character signals are formed, each group having a second definite number of intelligence periods which second number is less than said first number and is a multiple thereof; means operatively connected to said input means and to said enciphering means for producing character identification intelligence periods and for adding a sufficient number of said identification periods to each enciphered group such that a character group having a number of intelligence periods equal to said first definite number is formed and applied to an output lead at said transmission end; and means located at the signal reception end of said system for receiving said character groups, for eliminating said identification periods from said groups, for deciphering said enciphered groups, and for reconstituting said plain alphabet signals such that the characters of the alphabet are formed out of their first definite number of intelligence periods.
Claim 4
Dependent Claim
238 words
Ciphering apparatus for use with a signal transmission system where the system includes a signal transmission end and a signal recepTion end and where signals to be transmitted are characterized as binary coded signals forming a plain language alphabet, each of the characters of said alphabet being comprised of a first definite number of signal intelligence periods, and as servicing signals, including input means for applying said binary coded signals to said system and to said apparatus; means operatively connected to said signal input means for sequentially enciphering said signals such that groups of enciphered character signals are formed, each group having a second definite number of intelligence periods which second number is less than said first number and is a multiple thereof; means operatively connected to said input means and to said enciphering means for producing character identification intelligence periods and for adding a sufficient number of said identification periods to each enciphered group such that a character group having a number of intelligence periods equal to said first definite number is formed and applied to an output lead at said transmission end; and means located at the signal reception end of said system for receiving said character groups, for eliminating said identification periods from said groups, for deciphering said enciphered groups, and for reconstituting said plain alphabet signals such that the characters of the alphabet are formed out of their first definite number of intelligence periods.
Claim 5
Dependent Claim
136 words
Ciphering apparatus according to claim 2 further including: means connected to said signal input means and to said enciphering means for storing signals applied to said apparatus, the capacity of said storage means being equal to said first definite number of intelligence periods; a time base having as many stages as the number of intelligence periods applied to said output lead; means operatively connected to said enciphering means and to said time base and controlled by said time base for periodically interrupting the enciphering of said plain alphabet intelligence periods; and wherein said means for producing character identification intelligence periods further includes means operatively connected to and under the control of said time base and connected to said output lead for applying said character identification intelligence periods to said output lead when said enciphering is interrupted.
Claim 6
Dependent Claim
78 words
Ciphering apparatus according to claim 2 wherein said means for producing character identification intelligence periods includes means for sequentially and periodically storing selected intelligence periods of said plain language alphabet and for performing a logical operation on said stored intelligence periods such that intelligence periods taken from the output of said storing means uniquely identify enciphered characters as distinguished from servicing signals when the said identification periods are added to said enciphered intelligence periods to form character groups.
Claim 7
Dependent Claim
146 words
Ciphering apparatus according to claim 2 further including a time base, and wherein the characters of said plain language alphabet signals each consist of five intelligence periods and wherein: said enciphering means comprises means connected to said time base and controlled thereby for sequentially enciphering four of said plain language intelligence periods and for sequentially applying said thus enciphered intelligence periods to said output lead to thereby form a portion of said character group; and wherein said means for producing character identification periods comprises means for converting a plain language intelligence period from a selected one of said five periods into its complement; said conversion means being connected to said time base and controlled thereby such that said means adds said complementary period to said four enciphered periods to complete the character group in such a manner that it is uniquely identified as a character group.
Claim 8
Dependent Claim
128 words
Ciphering apparatus according to claim 2 wherein said last named means comprises: an input time controlled inhibiting means for eliminating said character identification periods from said character group; deciphering means connected to said inhibiting means for sequentially deciphering enciphered intelligence periods; intelligence period storage means operatively connected to said deciphering means for storing said deciphered periods, said storage means having a capacity to store said first definite number of intelligence periods; means operatively connected to said deciphering means and to said storage means for controlling the application of deciphered periods to said storage means such that the characters of said plain alphabet are reconstituted sequentially in said storage means; and output means for reading out the contents of said store each time the storage means reaches full capacity.
References Cited (Backward Citations)
US3229037A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-30 | 1977-01-29 | 1977-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-30 | 1981-01-29 | 1981-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-30 | 1985-01-29 | 1985-07-31 | $7700.00 | Window Closed / Lapsed |