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| 국가/구분 | United States(US) Patent 등록 |
|---|---|
| 국제특허분류(IPC7판) |
|
| 출원번호 | US-0860586 (1977-12-14) |
| 발명자 / 주소 |
|
| 출원인 / 주소 |
|
| 인용정보 | 피인용 횟수 : 1106 인용 특허 : 0 |
A cryptographic communications system and method. The system includes a communications channel coupled to at least one terminal having an encoding device and to at least one terminal having a decoding device. A message-to-be-transferred is enciphered to ciphertext at the encoding terminal by first e
A cryptographic communications system and method. The system includes a communications channel coupled to at least one terminal having an encoding device and to at least one terminal having a decoding device. A message-to-be-transferred is enciphered to ciphertext at the encoding terminal by first encoding the message as a number M in a predetermined set, and then raising that number to a first predetermined power (associated with the intended receiver) and finally computing the remainder, or residue, C, when the exponentiated number is divided by the product of two predetermined prime numbers (associated with the intended receiver). The residue C is the ciphertext. The ciphertext is deciphered to the original message at the decoding terminal in a similar manner by raising the ciphertext to a second predetermined power (associated with the intended receiver), and then computing the residue, M′, when the exponentiated ciphertext is divided by the product of the two predetermined prime numbers associated with the intended receiver. The residue M′corresponds to the original encoded message M.
A communications system for transferring a message signal Mi comprising k terminals, wherein each terminal is characterized by an encoding key Ei=(ei, ni) and decoding key Di=(ei, ni), where i=1,2, . . . ,k, and wherein Mi corresponds to a number representative of a message signal to be transmitted
A communications system for transferring a message signal Mi comprising k terminals, wherein each terminal is characterized by an encoding key Ei=(ei, ni) and decoding key Di=(ei, ni), where i=1,2, . . . ,k, and wherein Mi corresponds to a number representative of a message signal to be transmitted from the ith terminal, ni is a composite number of the form ni=piㆍqi Pi and qi are prime numbers, ei is relatively prime to 1 cm(pi-1,qi-1), di is a multiplicative inverse of ei(mod(1 cm((pi-1),(qi-1)))) wherein a first terminal includes means for encoding a digital message word signal MA for transmission from said first terminal (i=A) to a second terminal (i=B), said first terminal including: means for transforming said message word signal MA to one or more message block word signals MA′, each block word signal MA being a number representative of a portion of said message word signal MA in the range 0≤MA≤nB-1, means for transforming each of said message block word signals MA″to a ciphertext word signal CA, CA corresponding to a number representative of an encoded form of said message block word signal MA″, whereby: CA≡MA″eB(mod nB).
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