| 摘要 |
PROBLEM TO BE SOLVED: To provide an encrypting transmission system of a simple constitution, which can execute encrypted communication even in a transmission path wherein data flows intermittently like a packet transmission. SOLUTION: A first communication device 1 has a transmission side privacy key generation circuit 13 for generating a transmission side privacy key KA for a second intermittent signal based on a first intermittent signal A before encrypting, a transmission side memory 14, which delays the transmission side privacy key KA to be used for coding of a second intermittent signal, and an encrypting circuit 11, and it executes coding to an intermittent signal A and makes it an encrypted signal CA (intermittent signal), and thereafter sends it in a transmission circuit 12. A second communication device 6 has a receiving side privacy key generation circuit 63, which generates a receiving side privacy key KA for a second intermittent signal based on a first intermittent signal A' after decoding and a receiving side memory 64, which delays a receiving side privacy key KA to be used for coding of a second intermittent signal and a receiving circuit 61, and it decodes a received encrypted signal CA in a decoding circuit 62. |
