5 results about "Key distribution" patented technology

The invention discloses a quantum key distribution system based on quantum true random numbers. A quantum state measurement module is used for measuring quantum states of quantum light sources received from quantum channels by employing random numbers generated by a receiving end and the frequency same to that of a sending end quantum light source; a receiving end master control module is also used for numbering each time of measurement of the quantum state measurement module; a postprocessing module is used for carrying out basic information comparison on measurement results through classical channels according to a BB84 protocol; and the postprocessing module also is used for partially disclosing a key after the basic information comparison, estimates a bit error rate of this time of communication and carries out correction and secret keeping amplification processing on the surplus key, thereby enabling a transmitting end master control module and the receiving end master control module to generate and output the same safety key. The invention also discloses a quantum key distribution method based on the quantum true random numbers. According to the system, the difficult problem that the true random numbers are not employed in an existing high-speed quantum key distribution system is solved, and the true random number barrier of the quantum key distribution system with the higher speed in the future is removed.

The invention discloses a CDMA port-to-port encryption communication system and a key distribution method thereof, the CDMA port-to-port encryption communication system comprises a CDMA network and a terminal mobile telephone thereof, a public switched telephone network and a terminal fixed-line telephone thereof, a short message service center as well as the following three cipher processing units including a cipher chip of a mobile telephone terminal, a key distribution management center (KDMC) and a Firmware cipher module of a gateway mobile switching center. The key distribution management center is used for key distribution management of the communication system. The key distribution is realized by a layered distribution method, i.e. a first layer is an equipment key which is distributed in the process of initialization; a second layer is a key-encryption key and a short message service key which are distributed in startup of an enciphered mobile telephone; and a third layer is a session key which is distributed every time a session is launched between the enciphered mobile telephones. At the same time, by adopting a bidirectional certification technology for key distribution and combination of a key update and remote destroying method, the safety risk in key exposure is reduced, and the communication safety is improved.