Secure key sharing system and encryption key sharing method between two points safely

摘要

Problem to be solved: to provide a cryptographic key sharing system and a cipher key sharing method capable of sharing an information theoretically secure cryptographic key in a plurality of base stations without leaving all information of the key information on the side of the vehicle.Solution includes a first random number and a second random numberKey information generating means 131 for generating key information used to generate cryptographic keysA first storage means 132a storing said first random numberA first transmitting means 133a for transmitting said first random number to a plurality of base stationsThe first random number stored by the first storage means 132a is deleted andA second storage means 132b storing the second random numberAfter the second storage means has stored the second random number,A second transmitting means 133b for transmitting said second random number to a plurality of said base stationsBased on said key information including said first random number and said second random numberIt is characterized in that there is provided a cipher key generating means 241 for generating the encryption key shared between the plurality of base stations.Diagram