Communication system for encrypted data and apparatus for selectively recording and reproducing received analog signal and received digital signal
First Claim
1. An apparatus for transmission of encrypted data comprising:
- a memory for storing a plurality of customer identifying codes and arithmetic formulas set for individual customers;
means for reproducing data requested for transmission by a customer;
means for reading a customer identifying code and an arithmetic formula of the customer requesting transmission and generating an initial value;
means for operating the initial value pursuant to said read-out arithmetic formula to calculate a key signal;
encrypting means for encrypting data from said reproducing means on the basis of the key signal from said calculating means to generate main data to be transmitted; and
means for multiplying said main data with said initial value and said customer identifying code and transmitting a resulting signal.
2 Assignments
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Accused Products
Abstract
A communication system has an analog signal broadcasting station for transmitting an analog signal, a digital signal broadcasting station for transmitting a digital signal and a receiving unit for receiving the analog signal from the analog signal broadcasting station and the digital signal from the digital signal broadcasting station. The receiving unit has a recording and reproducing unit for selectively recording one of received analog and digital signals. The recording and reproducing unit has heads for analog signal each having a predetermined azimuth angle and operative to record an analog signal and heads for digital signal each having an azimuth angle larger than that of the analog signal head and operative to record a digital signal, and performs selective recording and reproduction of the analog signal and the digital signal on and from a recording medium.
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Citations
11 Claims
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1. An apparatus for transmission of encrypted data comprising:
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a memory for storing a plurality of customer identifying codes and arithmetic formulas set for individual customers;
means for reproducing data requested for transmission by a customer;
means for reading a customer identifying code and an arithmetic formula of the customer requesting transmission and generating an initial value;
means for operating the initial value pursuant to said read-out arithmetic formula to calculate a key signal;
encrypting means for encrypting data from said reproducing means on the basis of the key signal from said calculating means to generate main data to be transmitted; and
means for multiplying said main data with said initial value and said customer identifying code and transmitting a resulting signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
compression means for compressing and coding said plurality of pieces of data reproduced from said reproducing means; and
means for time-division multiplexing coded data from said compression means, said encryption means being means for encrypting a time-division multiplexed signal from said time-division multiplexing means.
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3. A receiving unit for receiving main data transmitted from the transmitting apparatus as recited in claim 1, said receiving unit comprising:
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means for receiving multiplexed data transmitted from said transmitting apparatus;
receiving demultiplexing means for demultiplexing said multiplexed data received by receiving means to provide said main data, said initial value and said customer identifying code;
receiving unit memory for storing an identifying code and an arithmetic formula which are identical to those of this customer stored in said memory of said transmitting apparatus;
arithmetic means for confirming reception of data requested for transmission by this customer by collating said customer identifying code with said identifying code in said receiving unit memory and operating said demultiplexed initial value pursuant to said arithmetic formula in said receiving unit memory to calculate a key signal;
recording and reproducing unit for recording and reproducing said main data; and
first decryption means for decrypting said main data on the basis of the key signal calculated by said arithmetic means to provide said data requested for transmission.
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4. The receiving unit according to claim 3 further comprising an IC card including said receiving unit memory and said arithmetic means and detachably mounted to a main body of said receiving unit.
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5. The receiving unit according to claim 3 further comprising:
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means for encrypting the key signal calculated by said arithmetic means by using the identifying code from said receiving unit memory; and
means for multiplexing the key signal encrypted by said encryption means and main data from said receiving demultiplexing means, said recording and reproducing unit being means for recording data multiplexed by said multiplexing means.
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6. The receiving unit according to claim 5 further comprising:
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means for demultiplexing multiplexed data reproduced from said recording and reproducing unit into said main data and said encrypted key signal; and
second decryption means for decrypting said encrypted key signal from said demultiplexing means on the basis of said identifying code to provide said key signal.
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7. The receiving unit according to claim 3, wherein said recording and reproducing unit records said initial value and said main data, said arithmetic means is means for providing said key signal by operating said initial value reproduced from said recording and reproducing unit pursuant to said arithmetic formula read out of said receiving unit memory, and said main data reproduced from said recording and reproducing unit is decrypted on the basis of said key signal calculated by said arithmetic means.
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8. An apparatus for recording at least encrypted main data and a key signal decrypting said encrypted main data, comprising:
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a memory for storing an identifying code which identifies an individual customer, and an arithmetic algorithm set for said individual customer;
an arithmetic circuit for calculating the key signal by using said arithmetic algorithm, and an encryption circuit for encrypting the key signal by using said identifying code;
a multiplexing circuit for multiplexing said encrypted main data and said encrypted key signal; and
a recording circuit for recording said encrypted main data and said encrypted key signal multiplexed by said multiplexer circuit.
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9. An apparatus for reproducing at least encrypted main data and an encrypted key signal decrypting said encrypted main data, from a storage medium,
said storage medium containing a key calculated by an arithmetic algorithm that is specific to an individual customer, and encrypted by using an identifying code specific to the individual customer, and further containing main data that have been encrypted using the key, said apparatus comprising: -
a demultiplexing circuit for demultiplexing said encrypted key signal from reproduced data;
a memory for storing said identifying code that is specific to said individual customer;
a first decryption circuit for decrypting said encrypted key signal demultiplexed by said demultiplexing circuit by using said identifying code; and
a second decryption circuit for decrypting said encrypted main data by using said key signal calculated by said arithmetic algorithm, which key signal has been decrypted by said first decryption circuit.
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10. An apparatus for transmitting at least encrypted main data and a key signal decrypting said encrypted main data, comprising:
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a memory for storing an identifying code which identifies an individual customer, and an arithmetic algorithm set for said individual customer;
an arithmetic circuit for calculating the key signal by using said arithmetic algorithm, and an encryption circuit for encrypting the key signal by using said identifying code;
a multiplexing circuit for multiplexing said encrypted main data and said encrypted key signal; and
an output circuit for delivering said encrypted main data and said encrypted key signal multiplexed by said multiplexing circuit.
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11. An apparatus for receiving transmitted data containing at least encrypted main data multiplexed with an encrypted key signal decrypting said encrypted main data,
said transmitted data containing a key calculated by an arithmetic algorithm that is specific to an individual customer, and encrypted by using an identifying code specific to the individual customer, and further containing main data that have been encrypted using the key, said apparatus comprising: -
a demultiplexing circuit for demultiplexing said encrypted key signal from received data;
a memory for storing said identifying code that is specific to said individual customer;
a first decryption circuit for decrypting said encrypted key signal demultiplexed by said demultiplexing circuit by using said identifying code; and
a second decryption circuit for decrypting said encrypted main data by using said key signal calculated by said arithmetic algorithm, which key signal has been decrypted by said first decryption circuit.
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Specification