Broadcasting encrypted messages using session keys

Details Broadcasting encrypted messages using session keys Broadcasting encrypted messages using session keys

H - Electricity

04

L

H04L 9/28 (2006.01) H04L 9/08 (2006.01)

Patent

CA 2296631

A device and method for sending encrypted data to multiple recipients is provided. The device comprises a message recorder, an encryptor, and a transmitter. The message recorder is operative to store a message to be sent to multiple recipients. The encryptor is operative to encrypt the message thereby generating a first encrypted message. The encryptor is also operative to: select a session key, encrypt the message using the session key thereby generating the first encrypted message, encrypt the session key with a first secret thereby generating a first encrypted session key, encrypt the session key with a second secret thereby generating a second encrypted session key, and generate a second encrypted message comprising the first encrypted session key, the second encrypted session key and the first encrypted message. The transmitter is operative to transmit the second encrypted message. The method comprises the steps of: acquiring a session key; encrypting the message using the session key to generate a first encrypted message; encrypting the session key using a first secret thereby generating a first encrypted session key; encrypting the session key using a second secret thereby generating a second encrypted session key; encrypting the session key using a third, fourth, , n-th secret thereby generating a third, fourth, , n-th encrypted session key, respectively; and broadcasting an outgoing message comprising the first encrypted message, the first encrypted session key, and, the second, third, fourth,, n-th encrypted session keys. Also, in accordance with the present invention, a method for retrieving a message is provided. The method comprises the steps of acquiring an encrypted message; searching the encrypted message for a first encrypted session key; decrypting the first encrypted session key to retrieve a session key; and decrypting a message block in the encrypted message using the retrieved session key.

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