Electrical computers and digital processing systems: support – Data processing protection using cryptography
Reexamination Certificate
2007-06-05
2007-06-05
Song, Hosuk (Department: 2135)
Electrical computers and digital processing systems: support
Data processing protection using cryptography
C713S193000, C380S277000
Reexamination Certificate
active
10611879
ABSTRACT:
When an encrypted program and a decryption program are inputted to a first memory, a semiconductor integrated circuit device causes a bus port to disable access from the outside and enables access to the first memory and to a second memory, thereby transferring the encrypted program and the decryption program from the first memory to the second memory. When the transfer is completed, the semiconductor integrated circuit device disables access to the first memory and gives, to a CPU, an instruction to decrypt the encrypted program by using a secret key held in a secret key holder and the decryption program and execute the decrypted program. After the execution of the decrypted program is completed, the semiconductor integrated circuit device disables access to the second memory.
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Shan April
Song Hosuk
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