| 摘要 |
PURPOSE:To securely encipher immediate communication type information and storage type information at a high speed and to send the result through a same transmission line by providing a common key enciphering means, a public key enciphering means and a common key control means. CONSTITUTION:A transmission terminal equipment 1 is provided with a magnetic storage device 101, non-forgery is recognized in a digital signature section 102 and the storage type information is enciphered by a public key enciphering means 103. An incoming signal is decoded in a public key decoding section 104 to execute signature confirmation 105. An immediate communication type information generator 106 is provided with a telecamera and a VTR or the like, and a pseudo-random number generating section 109 generates a pseudo-random number series synchronously with a clock from a clock extraction section corresponding one to one to a data key given from a storage device 101 and the series is inputted to an interface 112 via an exclusive OR gate 110. A charging information collection section 111 measures operating state of the pseudo-random number generator to adopt the information relating to a value of the sent information. A terminal equipment 2 has the similar constitution and receives and decodes the information of the terminal equipment 1. Through the constitution above, a common key is used only once and information is sent securely at a high speed. |
