Electrical computers and digital processing systems: support – Multiple computer communication using cryptography – Central trusted authority provides computer authentication
Reexamination Certificate
2007-01-30
2007-01-30
Torres, Joseph D. (Department: 2133)
Electrical computers and digital processing systems: support
Multiple computer communication using cryptography
Central trusted authority provides computer authentication
C713S170000, C380S282000, C380S030000
Reexamination Certificate
active
10101122
ABSTRACT:
A method of providing a secure communication between first and second devices is described. The method includes encrypting a random key using an encryption key at a first device and transferring the encrypted random key to the second device for encryption of data communicated from the second device to the first device. The encrypted data received from the second device is decrypted using the random key. The method typically includes transferring a control word encrypted with an encryption key to the second device for decryption, and encryption using the random key. The encrypted control word received from the second device is then decrypted using the random key. The invention extends to a method of enabling a decoder, and to a decoder, to decode a data stream. It also extends, inter alia, to a method of authenticating an enabling device and to an enabling device.
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Davies Donald Watts
Glasspool Andrew
Rix Simon Paul Ashley
Irdeto Access B.V.
Schwegman Lundberg Woessner & Kluth P.A.
Torres Joseph D.
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