Memory card and data distribution system using it

Details Memory card and data distribution system using it Memory card and data distribution system using it

2008-03-04

2008-03-04

Song, Hosuk (Department: 2135)

Cryptography

Video cryptography

Copy protection or prevention

C380S044000, C380S277000, C713S189000, C713S193000

Reexamination Certificate

active

07340055

ABSTRACT:
A memory card (110) conducts an authentication process with a server based on data stored in an authentication data hold unit (1400). The memory card (110) extracts a first session key (Ks1) from a server by a decryption process and a transaction ID from the data applied on a data bus (BS3). The memory card (110) generates a second session key (Ks2) through a session key generation unit (1418), and transmits to the server, as the keys to encrypt content data in receiving decryption of content data, the second session key (Ks2) and a key (KPm(1)) unique to the memory card (110) in an encrypted state with the first session key (Ks1). The transaction ID and the second session key (Ks2) stored in the log memory (1460) are used in the redistribution process.

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