Recorder
First Claim
1. A recording device (110) for receiving and recording data encrypted with a first public encryption key (KPm(i)) predetermined with respect to the recording device, and used for decrypting encrypted content data, comprising:
- a first key holding portion (1421) for holding a first private decryption key (Km(i)) being asymmetric to said first public encryption key and used for decrypting data encrypted with said first public encryption key;
a first decryption processing portion (1422) for receiving a license key encrypted with said first public encryption key, and decrypting the received data with said first private decryption key;
a second key holding portion (1450, 1451) for holding at least one secret unique key (K(i)) being unique to said recording device and being symmetric in a symmetric key cryptosystem;
a first encryption processing portion (1452) for receiving and encrypting said license key again with said secret unique key;
a recording portion for receiving and storing the output of said first encryption processing portion; and
a second decryption processing portion (1454) for decrypting said license key stored in said recording portion with said secret unique key.
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Accused Products
Abstract
A memory card (110) decodes data delivered to a data bus (BS3) and extracts a session key (Ks1) sent from a server from the data. Based on the session key (Ks1), an encrypting section (1406) encrypts a public encryption key (KPm (1)) of the memory card (110) and delivers it to a server through the data bus (BS3). The memory card (110) receives data including a license key (Kc) and a license (ID) encrypted with the public encryption key (KPm (1)) different with memory card to memory card, decrypts the data, encrypted it again with uniquely given secret key (K(1)), and stores it in a memory (1415).
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Citations
14 Claims
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1. A recording device (110) for receiving and recording data encrypted with a first public encryption key (KPm(i)) predetermined with respect to the recording device, and used for decrypting encrypted content data, comprising:
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a first key holding portion (1421) for holding a first private decryption key (Km(i)) being asymmetric to said first public encryption key and used for decrypting data encrypted with said first public encryption key; a first decryption processing portion (1422) for receiving a license key encrypted with said first public encryption key, and decrypting the received data with said first private decryption key; a second key holding portion (1450, 1451) for holding at least one secret unique key (K(i)) being unique to said recording device and being symmetric in a symmetric key cryptosystem; a first encryption processing portion (1452) for receiving and encrypting said license key again with said secret unique key; a recording portion for receiving and storing the output of said first encryption processing portion; and a second decryption processing portion (1454) for decrypting said license key stored in said recording portion with said secret unique key. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification