Patent ID: 7082199
Filing Date: 2006-07-25
Classification: H04L

Abstract:
1. A system for transmitting a signal from a first device to a second device, the system including a transmitting section disposed in the first device and a receiving section disposed in the second device, the transmitting section comprising: an encryption key generator for generating an encryption key from said signal; a memory for temporarily storing the encryption key, thereby delaying the encryption key with respect to said signal; an encryption circuit for encrypting said signal by use of the delayed encryption key; and a transmitting circuit for transmitting the encrypted signal to the second device; the receiving section comprising; a receiving circuit for receiving the encrypted signal from the first device; a decryption circuit for decrypting the encrypted signal by use of a delayed decryption key; a decryption key generator for generating a decryption key from the decrypted signal; and a memory for temporarily storing the decryption key, thereby delaying the decrypted signal and obtaining the delayed decryption key, wherein: the receiving circuit in the receiving section in the second device detects transmission errors in the encrypted signal; the second device has an initialization control signal generator for generating an initialization control signal when the receiving circuit detects a transmission error in the encrypted signal; the second device also has a transmitting circuit for transmitting the initialization control signal to the first device; and the first device has a receiving circuit for receiving the initialization control signal and thereupon sending an initialization command signal to the encryption circuit, the encryption key generator, and the memory in the transmitting section.