前苏联专利SU963479A3 Data transmission and reception system

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专利摘要:

公开号:SU963479A3
申请号:SU802987385
申请日:1980-02-05
公开日:1982-09-30
发明作者:Клод Гийу Луи
申请人:Этаблиссеман Пюблик Де Диффюзьон Ди "Теледиффюзьон Де Франс" Фирма；Лъэта Франсэ Репрезанте Пар Ле Секретэр Дъэта О Пост Э Телекоммюникасьон /Сантр Насьональ Д Этюд Де Телекоммюникасьон (Фирма)；
IPC主号:

专利说明:

the codes and the key signal generator, whose outputs are connected respectively to the first input of the message generator and to the second input of the blocking node, the output of the control unit j by recording the subscription codes is connected to the second input of the formed message bodies. formations, subscription memory card, key signal recovery unit and unlock node. The first output of the receiver is connected to the first input of the unlock node,. the output of which is connected to the input of the indicator, the output of the service information input unit through the subscription memory card is connected to the input of the key signal recovery unit, the second output of the receiver is connected to the second input of the unit. the key signals, the output of which is connected to the second input of the unlocking unit, the second output of the subscription codes recording control unit is connected to the second input of the service information input unit.
The drawing shows a diagram of a system for transmitting and receiving information.
The system includes a subscription code recording control unit 1, a transmitting center 2, a driver 3 messages, 4 key signal generator, information source 5, a signal generator 6, blocking node 7, a transmitter 8, block 9. subscription memory card 11, key recovery signal block 12, unlock node 13 and indicator 1.40
The system of transmission and reception of information works as follows.
The signals of the information source 5 through the shaper 6 of the signals are fed to the first input of the blocking node 7, whose operation is controlled by the key signal generator k. The subscription codes recording control unit 1 controls the operation of the formation of 50 bodies of 3 messages executed on the microprocessor, the signals from the output of which and the signals of the blocking node arrive at the input of the transmitter. From the outputs of the receiver 10, the signals through 55 the recovery unit 12 and through the unlocking unit 13 enter the indicator input.
The 3 message driver circuit is organized around a programmable microprocessor for the implementation of an algorithm based on two Galois fields, having Marsenn prime numbers of 2-1 and 2 -1 as a characteristic. This algorithm uses subscription keys of 12 and 128 binary elements and one serving key of 5b binary elements as follows.
a) a code group TG of random error is formed, containing 61 binary elements, transmitted in a random order with each activation of the algorithm;
b) the inverse / modulo modulus is calculated by an arithmetic program using a variant of the Euclidean algorithm,
in the first multiplication with another arithmetic program l) K7T7no module 2
rj is calculated by -y, inverse of C modulo, by means of a program similar to paragraph b;
e) Finally, the message is counted by means of a program similar to the clause in (-t) +: g%) modulo.
Thus, messages are generated, and a deployable algorithm in shaper 3 for recovering the service key from message M., and from one subscription key 12 is as follows:
a) message 127 used binary elements) is captured byte by byte and C. is multiplied by the first field C 2 -1. This forms group C modulo.
According to condition M, the transmission of binary elements from 1 to 61 represents a group, while binary elements from B5 to 126 represent a group of Tt. Of course, binary elements 62-6, 126 and 127 must be zero. If they are not, the group is zero before continuing counting.
6) 17 and V are multiplied by the second field C (that eliminates random redundancy, and receive KA fT modulo 7-1,
in / 56 used binary elements K are thus reduced to the form of eight unpaired bytes.
For each paid service, approximately every five minutes, a new service key Ki is arbitrarily transmitted by each transmitting center of interest. Thus, during one service period (one or several hours), several service keys can follow each other,
From the moment of the transfer of the new service key K by the transfer center, it counts for each existing Byjonero service for this subscription key service C ;, using the (; (
Thus, for a service provided with the above: subscription scheme, 22 different messages are valid at any time. The existence of a message is equal to the length of the service key K, and for one given service there are as many messages at any time as there are existing subscription keys.
The set of active messages M form information access control, participating in the transmitted service, which provides enhanced functionality of the device.

权利要求:
Claims (2)
[1]
1. Flaps. Control mathematical machines, M., 19b7,
with. 472. FIG. 215.
[2]
2. In the same place fig 216 (prototype).
but

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同族专利:

公开号 | 公开日

FR2448825B1|1984-05-11|

WO1980001635A1|1980-08-07|

ES488279A0|1980-08-01|

JPS56500075A|1981-01-22|

EP0014653B1|1984-10-03|

DE3069329D1|1984-11-08|

EP0014653A1|1980-08-20|

ES8106993A1|1980-08-01|

US4323921A|1982-04-06|

JPH027234B2|1990-02-16|

CA1157144A|1983-11-15|

FR2448825A1|1980-09-05|

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法律状态:

优先权:

申请号 | 申请日 | 专利标题

FR7902995A|FR2448825B1|1979-02-06|1979-02-06|

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