Method and system for encryption of streamed data

A system for the secure transmission of information over a communications network, the system comprising:

• (a) a transmitting set, said transmitting set having an encryption module, wherein said encryption module receives a session key, generates an encryption signal based upon said session key, generates a bitstream, said bitstream including voice data preceded by a synchronization vector that has been derived from said session key, and encrypts said bitstream with said encryption signal to transmit an encrypted bitstream;
• and
• (b) a receiving set, said receiving set including a decryption module, wherein said decryption module receives said encrypted bitstream from said transmitting set, generates said encryption signal based upon said session key, and decrypts said encrypted bitstream using said encryption signal to identify said synchronization vector,
• wherein said decryption module is configured to synchronize said encryption signal to said encrypted bitstream based on identification of said synchronization vector to permit recovery of said voice data from said encrypted bitstream.

A handset for use in a communications network for secure communications between the handset and a corresponding set, the handset comprising:

• an encryption module, said encryption module receiving a session key, generating an encryption signal based upon said session key, generating an output bitstream, said output bitstream including voice data preceded by a synchronization vector that has been derived from said session key, and encrypting said output bitstream with said encryption signal to transmit an encrypted bitstream;
• and
• a decryption module, said decryption module receiving said session key, generating said encryption signal based upon said session key, receiving an incoming bitstream from the corresponding set, and decrypting said incoming bitstream using said encryption signal to identify said synchronization vector,
• wherein said decryption module is configured to synchronize said encryption signal to said encrypted bitstream based on identification of said synchronization vector to permit recovery of said voice data from said encrypted bitstream.

A method for secure transmission of streamed voice data in a network between a transmitting set and a receiving set, the method comprising:

• (a) providing the transmitting set and the receiving set with a seed value and a predetermined first function;
• (b) at each of the transmitting set and the receiving set, applying the predetermined first function to the seed value to produce a session key;
• (c) at the transmitting set, generating an encryption signal based upon said session key generating a bitstream, wherein said bitstream includes a synchronization vector and the streamed voice data, said synchronization vector comprising said session key, and encrypting said bitstream with said encryption signal to produce an encrypted bitstream;
• (d) transmitting said encrypted bitstream from the transmitting set to the receiving set;
• and
• (e) at the receiving set, generating said encryption signal based upon said session key and decoding said encrypted bitstream using said encryption signal to obtain the streamed voice data.