Encrypting speech coder

Details Encrypting speech coder Encrypting speech coder

H - Electricity

04

L

H04L 9/18 (2006.01) H04K 1/00 (2006.01) H04L 1/00 (2006.01) H04L 9/06 (2006.01)

Patent

CA 2270081

The present invention is an encrypting speech processor architecture that provides enhanced security without the use of external cryptosync and with minimal speech degradation. This is accomplished by incorporating a black encryptor (34) and a keystream generator (36) (instead of a fixed secret mask encryption scheme, such as those implemented in voice ciphers) for encrypting blocks of encoded speech bits at a transmitter side. The block encryptor (34) employs an invertible cryptographic algorithm and internal cryptosync to convert a first block of encoded speech bits into a first ciphertext block (output 34). The first ciphertext block (output 34) is used to generate a keystream (output 36), which is then used to encrypt a second ciphertext block (FIG. 2).

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