Encryption system with time-dependent decryption
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United States of America Patent
Stats
-
Apr 30, 2002
Grant Date -
Dec 13, 2001
app pub date -
Jul 14, 1998
filing date -
Aug 22, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An object of the invention is to provide an encryption system and method for inhibiting the decryption of encrypted data unless a decryption condition is satisfied. Thus, according to the present invention, in order to provide the encryption system for inhibiting the decryption of encrypted data unless a decryption condition is satisfied, decryption enabled time is designated as a decryption condition, and an encryption system incorporating time-dependent decryption is constituted by a time-key certificate and a time-key certificate manager. A time-key certificate is employed when a third party proves that a public encryption key added to the certificate satisfies the decryption condition. The time-key certificate manager issues a time-key certificate and then manages a decryption key.
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