Method for encrypting and embedding information in a video program
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United States of America Patent
Stats
-
Dec 3, 1996
Issued Date -
N/A
app pub date -
Jan 18, 1994
filing date -
Aug 19, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Apparatus and methods are provided for encrypting and decrypting information having a header portion and a body portion. The decrypting method includes the steps of reading a current month from a clock, extracting an odd/even month indication from the header portion, generating a first key based on the current month if the odd/even indication is odd and the current month is odd or if the odd/even indication is even and the current month is even, otherwise generating the first key based on a month previous to the current month read from the clock if the odd/even indication is odd and the current month is even or if the odd/even indication is even and the current month is odd, and using the first key for decrypting the encrypted body portion to generate a decrypted body portion.
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