公开(公告)号：CA2270081A1

公开(公告)日：1999-12-15

申请号：CA2270081

申请日：1999-04-22

Applicant: LUCENT TECHNOLOGIES INC

Inventor： YOUTKUS DONALD JOSEPH ,  FALCO STEVEN ANTHONY ,  MIZIKOVSKY SEMYON B ,  PEKRUL WINSTON EDWARD ,  RANCE ROBERT JOHN ,  BERENZWEIG ADAM L

IPC: G10L19/00 ,  H04K1/00 ,  H04L9/06 ,  H04L9/12 ,  H04L9/20 ,  H04L9/26 ,  H04Q7/38 ,  H04L9/18 ,  G10L3/00 ,  H04L1/00

Abstract: 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).