Encryption system capable of specifying a type of an encrytion device that produced a distribution medium

Encryption system capable of specifying a type of an encrytion device that produced a distribution medium

A decryption selection control unit controls a ciphertext read unit, a decryption key set read unit, and a decryption selection unit to respectively repeat an encrypted scramble key reading, a decryption key set reading, and an encrypted scramble key decryption until N encrypted scramble keys are re...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
1. Verfasser: TATEBAYASHI MAKOTO
Format: Patent
Sprache:eng
Schlagworte:
ADVERTISING
CODING OR CIPHERING APPARATUS FOR CRYPTOGRAPHIC OR OTHERPURPOSES INVOLVING THE NEED FOR SECRECY
CRYPTOGRAPHY
DISPLAY
EDUCATION
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
PHYSICS
SEALS
TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION
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Beschreibung
Zusammenfassung:A decryption selection control unit controls a ciphertext read unit, a decryption key set read unit, and a decryption selection unit to respectively repeat an encrypted scramble key reading, a decryption key set reading, and an encrypted scramble key decryption until N encrypted scramble keys are read from a distribution medium. As a result, N decryption keys that correctly decrypt the respective N encrypted scramble keys are selected. A key pattern detection unit detects an encryption key set, from M encryption key sets stored in an encryption key table, that matches the selected N decryption keys. A type of an encryption device that produced the distribution medium is specified using this encryption key set.