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OwnerTakeshi Yoshimura, Takashi Suzuki +2inventors
InventorsTakeshi Yoshimura, Takashi Suzuki, Toshiro Kawahara, Minoru Etoh
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An encryption apparatus and an encryption method are provided which can prevent a cryptographic key or authentication key from being broken. A voice stream is transmitted from a transmitting terminal to a receiving terminal. A bit stream of the voice stream includes speech bursts and speech pauses. Although the speech bursts are encrypted or provided with authentication information, the speech pauses are not encrypted or provided with authentication information, and are transmitted without change. Thus carrying out the encryption or the assignment of the authentication information selectively in accordance with the type of the bit stream makes it possible to prevent the cryptographic key or authentication key from being broken. Besides, it can reduce the processing amount of the encryption or authentication process, thereby being able to limit an increase in the information amount.
An encryption apparatus for encrypting and transmitting a bit stream of media information which is sent from a transmitting terminal, said encryption apparatus comprising:
A decryption apparatus comprising:
An authentication information assignment apparatus that provides authentication information to a bit stream of media information sent from a transmitting terminal, and sends them, said authentication information assignment apparatus comprising:
An authentication apparatus comprising:
An encryption method performed by an encryption apparatus for encrypting and transmitting a bit stream of media information which is sent from a transmitting terminal, said encryption method comprising the steps of:
A decryption method comprising the steps of:
An authentication information assignment method performed by an authentication information assignment apparatus that provides authentication information to a bit stream of media information sent from a transmitting terminal, and sends them, said authentication information assignment method comprising the steps of:
An authentication method comprising the steps of:
Dependencies are inferred from the claim text.