Information transmission system

Claim 2

An information transmission system comprising: first information converting means for converting a useful information from a source of information according to a first algorithm; second information converting means converting a first code information according to a second algorithm designated corresponding to a second key information. into a first key information that designates said algorithm; transmitting means for transmitting an output of said first information converting means to receiving means; first distributing means for distributing said first code information to said receiving means; second distributing means for distributing to said receiving means said second key information that designates said second algorithm; third information converting means which converts said first code information distributed by said first distributing means according to said second algorithm designated corresponding to said second key information distributd by said second distributing means so as to reproduce said first key information; and fourth information converting means which converts the output of said first information converting means transmitted by said transmitting means according to an inverse algorithm of said first algorithm designated by said first key information reproduced by said third information converting means, thereby reproducing said useful information.

Claim 3

The information converting system according to claim 1 wherein said first information converting means comprises a scrambler, while said fourth information converting means comprises a descrambler.

Claim 4

The information transmitting system according to claim 1 wherein each of said second and third information converting means comprises an encipher.

Claim 5

The information transmitting system according to claim 1 wherein said transmitting means transmits the output of said first information converting means to said receiving means through wireless.

Claim 6

The information transmitting system according to claim 1 whrein said transmitting means transmits the output of said first information converting means via electric conductors.

Claim 7

The information transmitting system according to claim 1 wherein said first distributing means distributes said first code information to said receiving means by using the same communication medium as said transmitting means.

Claim 8

The information transmitting system according to claim 1 wherein said second distributing means writes said second key information into memory means and distributes said written key information to said receiving means.

Claim 9

The information transmitting system according to claim 1 wherein said second distributing means distributes said second key information to said receiving means byusing the same communication medium as said transmitting means.

Claim 10

The information transmitting system according to claim 1 which further comprises a first memory means installed on the transmitting side for storing said second key information corresponding to said second code information, a second memory means provided for said receiving means for storing said second key information corresponding to said second code information, means for transmitting to said receiving means said second code information together with the output of said first information converting means, and means provided for said receiving means for reading out said second key information from said second memory means in accordance with said transmitted second code information.

Claim 11

The information transmitting system according to claim 9 wherein said second memory means stores said second key information only in accordance with a specific code signal corresponding to said receiving means among said second code signal.

Claim 12

The information transmitting system according to claim 1 wherein said source of information produces a television signal to be broadcast, and wherein said receiving means comprises a plurality of receiving offices which respectively receive said television signal for reproducing a picture.

Claim 13

The information transmitting system according to claim 11 wherein said first code information comprises an attribute signal representing an attribute of said television signal.

Claim 14

The information transmitting system according to claim 11 wherein said attribute signal comprises a code information selected from the group consisting of an office code identifying an office, a program code identifying a program and a tier code identifying a tier.

Claim 15

The information transmitting system according to claim 9 wherein said source of information produces a television signal to be broadcast, and said receiving means comprises a plurality of receiving offices which respectively receive said television signal for reproducing a predetermined picture image.

Claim 16

The information transmittting system according to claim 9 wherein said first code information comprises a first attribute signal representing a first attribute of said television signal, and said second code information comprises a second attribute signal representing a second attribute of said television signal.

Claim 17

The information transmission system according to claim 9 wherein said first attribute signal comprises an office code identifying an office, a program code identifying a program, and a tier code identifying a tier, whereas said second attribute signal comprises a tier code identifying a tier.

Claim 18

The information transmitting system according to claim 1 wherein said first code information is generated by a random number generator.

Claim 19

The information transmitting system according to claim 1 wherein said first key information is renewed at a higher rate than said second key information.

Claim 20

The information transmitting system according to claim 1 wherein said first information converting means changes an order of transmission of said television signal in an unit of a scanning line.

Claim 21

The information transmitting system according to claim 16 further comprising means provided on the transmission side for synthesizing and transmitting the output of said first information converting means, an office code, a program code and a tier code, a first separating means provided for said receiving means for separating the output of said first information converting means from a synthesized signal synthesized and transmitted.! by said synthesizing an transmitting means, and a second separating means also provided for said receiving means for extracting said tier code out of said office code, said program code and said tier code.

Claim 22

The information transmitting system according to claim 1 which further comprises a fifth information converting means provided on the transmission side for converting said second key information in accordance with a third algorithm designated by a third key information, and a sixth information converting means for converting an output of said fifth information converting means in accordance with an inverse algorithm of the third algorithm designated by said third key information so as to reproduce said second key information.

Claim 23

The information transmitting system according to claim 22 wherein said third key information is set corresponding to each receiving means.

Claim 24

The information transmitting system according to claim 22 wherein bit lengths of said first, second and third key informations are set to sequentially increase according to the order mentioned.

Claim 25

The information transmitting system according to claim 1 which is further provided with: on the transmitting side, first memory means for storing a second key information corresponding to said second code information, fifth information converting means for converting said second key information read out from said first memory means in accordance with a third algorithm designated by a third key information, and transmitting means for transmitting to said receiving means said second code information and the output of said fifth information converting means together with the output of said first information converting means, and on the receiving side, second memory means for stonng the output of said fifth information converting means transmitted from the transmitting side reading means for reading out the output of said fifth information converting means from said second memory means corresponding to said second code information transmitted from the transmitting side, and sixth information converting means for converting the output of said fifth information converting means read out by said reading means in accordance with an inverse algorithm of the third algorism designated by said third key information so as to reproduce said second key information.

Claim 26

The information transmitting system according to claim 1 wherein said receiving means further comprises memory means storing a received information representing a received information, pattern inserting means for inserting a predetermied pattern information into a receiving information read out from said memory means, a seventh information converting means for converting an output of said pattern inserting means in accordance with a predetermined algorithm, and means for distributing an output of said seventh information converting means to said transmitting side, and wherein said transmitting means further comprises an eighth information converting means converting azoutput of said seventh converting means distributed by said distributing means acccording to an inverse algorithm of said predetermined algorithm, means for separating said inserted predetermined pattern information from an output of said eighth information converting means, pattern checking means for checking whether said separated pattern information is correct or not, and means for recording a received information in acccordance with an output of said pattern checking means.

Claim 27

The information transmitting system according to claim 25 wherein the pattern information inserted by said pattern inserting means comprises a predetermined fixed pattern and a date pattern.

Claim 28

The information transmitting system according to claim 25 wherein said algorithm used in said seventh information converting means and said inverse algorithm used in said eighth information converting means are designated by said third key information.

Claim 29

The information transmitting system according to claim 25 wherein said distributing means transmits an output of said seventh information converting means to said transmitting side by using the same transmission medium as said transmitting means.

Claim 30

The information transmitting means according to claim 25 wherein said distributing means sends to transmitting side an output of said seventh information converting means via telephone lines.

Claim 31

In an information transmitting system of the type comprising first signal converting means for converting a useful signal generated by a signal source in accordance with a first algorithm, first means for transmitting an output of said first signal converting means to a purality of receiving means, and a second signal converting means for receiving the transmitted signal and then converting the signal into said useful signal, the improvement which comprises: third signal converting means that converts a first key information designating said first algorithm in accordance with a second algorithm; fourth signal converting means for converting a second key information designating said second algorithm utilized in said third signal converting means in acccordance with a third algorithm; second means for distributing outputs of said third and fourth signal converting means to respective receiving means; fifth signal converting means for converting an output of said fourth signal converting means sent by said distributing means into said second key information in accordance with an inverse algorithm of said third algorithm; sixth signal converting means for inverting an output of said third signal converitng means into said first key information by using said second key obtained by said fifth signal converting means, and means for operating said second signal converting means in accordance with an information produced by said sixth signal converting means.

Claim 32

In an information transmitting system of the type comprising first signal converting means for converting a useful signal generated by a signal source in accordance with a first algorithm, first means for transmitting an output of said first signal converting means to a purality of receiving means, and a second signal converting means for receiving the transmitted signal and then converting the signal into said useful signal, the improvement which comprises: third signal converting means that converts a first key information designating said first algorithm in accordance with a second algorithm; fourth signal converting means for converting a second key information designating said second algorithm utilized in said third signal converting means in acccordance with a third algorithm; second means for distributing outputs of said third and fourth signal converting means to respective receiving means; fifth signal converting means for converting an output of said fourth signal converting means sent by said distributing means into said second key information in accordance with an inverse algorithm of said third algorithm; sixth signal converting means for inverting an output of said third signal converitng means into said first key information by using said second key obtained by said fifth signal converting means, and means for operating said second signal converting means in accordance with an information produced by said sixth signal converting means.

Claim 33

The information transmitting system according to claim 30 wherein a third key information designating said third algorithm is set in accordance with said receiving means.

Claim 34

The information transmitting system according to claim 30 wherein bit lenghths of said first, second and third key information are set to become sequentially large according to the order just mentioned.

Claim 35

The information transmitting system according to claim 30 wherein said second means comprises third and fourth means independently distributing outputs of said third and fourth signal converting means.

Claim 36

The information transmitting system according to claim 30 wherein said first and third means utilize the same communication medium.

Claim 37

The information transmitting means according to claim 30 wherein said first, third and fourth means utilize the same communication medium.