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

  • US 20030095659A1
  • Filed: 11/15/2002
  • Published: 05/22/2003
  • Est. Priority Date: 11/16/2001
  • Status: Active Grant
First Claim
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1. A cryptographic key constituted to be freely attachable and detachable to/from an external device encrypting and decrypting data by use of a cipher key, the cryptographic key comprising:

  • a pseudo random number generator for generating a pseudo random number of a chaotic time series based on a data size of the data, a chaotic function and ail initial value of the chaotic function; and

    a transmission/reception control unit for receiving the data size of the data from the external device and transmitting the pseudo random number of the chaotic time series as the cipher key to the external device, the pseudo random number being generated in the pseudo random number generator, when the cryptographic key is attached to the external device.

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