Cryptographic key, encryption device, encryption/decryption device, cryptographic key management device, and decryption device

摘要

A cryptographic key 1 constituted to be freely attachable and detachable to/from a personal computer 2 encrypting and decrypting data by use of a cipher key includes: a pseudo random number generator 14 for generating a pseudo random number of a chaotic time series based on a data size of the data, a chaotic function and an initial value of the chaotic function; and a USB controller 12 for receiving the data size of the data from the personal computer 2 and transmitting the pseudo random number of the chaotic time series as the cipher key to the personal computer 2 , the pseudo random number being generated in the pseudo random number generator 14 , when the cryptographic key 1 is attached to the personal computer 2.