Abstract An apparatus for automatic enciphering and/or deciphering a text consisting of multidigit dual coded key characters supplied by a key character generator, comprising an adding device for dual addition of text characters and key characters. The adding device includes first inputs for introducing text characters, second inputs connected to the key character generator for introducing key characters, outputs for result characters obtained at each adding operation, and a transfer or carry output for transmission of a transfer signal when upon addition of the characters a transfer is obtained at the last digit. There is also provided a data processing device for digital signal sequences which is connected to the transfer or carry output, said data processing device being connected to said adding device ahead of said first or said second inputs, or following said outputs thereof, in order to modify the characters introduced into the data processing device in a definite manner, in accordance with a transfer or carry signal.
Inventors
👤 Sture Nyberg
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-10-25 20:23
CPC Classifications
G; G09; G09C; G09C1/00; G09C1/06; G09C1/10
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
153 words
Apparatus for automatic enciphering and/or deciphering of a text consisting of multidigit dual coded key characters supplied by a key character generator, comprising an adding device for dual addition of text characters and key characters, said adding device including first inputs for introducing text characters, second inputs connected to said key character generator for introducing key characters, outputs for result characters obtained at each adding operation, and a transfer output for transmission of a transfer signal when upon addition of the characters a transfer is obtained at the last digit, and a data processing device for digital signal sequences connected to said transfer output, said data processing device being connected to said adding device in a feedback loop from said transfer output of said adding device to one of said first and second inputs thereof, in order to modify the characters introduced into the data processing device, in accordance with said transfer signal.
Claim 2
Dependent Claim
153 words
Apparatus for automatic enciphering and/or deciphering of a text consisting of multidigit dual coded key characters supplied by a key character generator, comprising an adding device for dual addition of text characters and key characters, said adding device including first inputs for introducing text characters, second inputs connected to said key character generator for introducing key characters, outputs for result characters obtained at each adding operation, and a transfer output for transmission of a transfer signal when upon addition of the characters a transfer is obtained at the last digit, and a data processing device for digital signal sequences connected to said transfer output, said data processing device being connected to said adding device in a feedback loop from said transfer output of said adding device to one of said first and second inputs thereof, in order to modify the characters introduced into the data processing device, in accordance with said transfer signal.
Claim 3
Dependent Claim
29 words
Apparatus according to claim 1, wherein said data processing device comprises means effective in response to a control signal for cyclic permutation of the introduced characters by one digit.
Claim 4
Dependent Claim
25 words
Apparatus according to claim 1, wherein said data processing device is an adding device which adds the transfer character modulo 2n to the introduced characters.
Claim 5
Dependent Claim
36 words
Apparatus according to claim 3, wherein said adding data processing device is controlled by one of its inputs, said data processing device only when performing the addition when said one input carries a logical ''''L'''' signal.