Megachips Corporation

Fumiaki Tsukazaki

Tetsuo Furuichi

An information processing terminal sends a download request for content data to a server. The server transmits command data to a command encryption device. The command encryption device encrypts the command data in an encryption circuit. The server sends the content data and the encrypted command data to the information processing terminal. A control part of the information processing terminal transmits the content data and the encrypted command data to a memory controller. The memory controller decodes the command data in a decoder circuit and stores the content data to a memory array.

Information processing terminal and content writing system

Original data to be a source for an encryption key is read from a memory cell array and stored in a buffer region. An encryption key generation unit generates a plurality of encryption keys by variously modifying the original data read from the buffer region based on a predetermined generation rule. The encryption unit generates an encrypted command by encrypting commands individually with an encryption key different for each command, out of the plurality of encryption keys generated by the encryption key generation unit.

Signal processor with an encrypting or decrypting device in a memory system

A memory controller for controlling data access to a memory comprises a refresh controller. A read count memory part included in the refresh controller counts the number of read operations on each page of the memory and stores the read count therein. If the read count for any page exceeds a predetermined number, the refresh controller rewrites data stored in this page into the memory.

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Osaka, Japan

Fumiaki Tsukazaki