Information transmission system

Details Information transmission system Information transmission system

2004-07-01

2008-12-30

Kincaid, Kristine (Department: 2139)

Cryptography

Communication system using cryptography

Wireless communication

C380S204000, C380S224000, C380S225000, C380S260000, C380S262000

Reexamination Certificate

active

07471795

ABSTRACT:
A sending apparatus generates a first initial vector, a second initial vector, and an encryption key in response to a pseudo random number. Original information is encrypted into cipher information in response to the encryption key and the second initial vector. The cipher information and the first initial vector are transmitted from the sending apparatus to a receiving apparatus. The receiving apparatus generates a first initial vector, a second initial vector, and an encryption key in response to a pseudo random number equal to that in the sending apparatus. The cipher information is decrypted back to the original information in response to the generated encryption key and the generated second initial vector. The receiving apparatus compares the received first initial vector and the generated first initial vector to check whether or not encryption/decryption-related synchronization between the sending apparatus and the receiving apparatus is normally maintained.

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Japanese bookModern Cipher*, Tatsuaki Okamoto et al. Jun. 30, 1997. *English explanation of the portions submitted is given in the specification of the instant application.

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