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US 10,097,343 B2Granted
Data processing apparatus and data processing method
AssigneeFuji Electric Co., Ltd.
InventorKenji Takatsukasa
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AssigneeFuji Electric Co., Ltd.
InventorKenji Takatsukasa
Estimating the term…
A data processing apparatus that encrypts or decrypts data by Advanced Encryption Standard in which a plurality of key data are respectively prepared for a plurality of round processes that are performed in order, includes a selector that selects sub-round data of 4 bytes from input data that is a process target of a first round process; a converter that converts each data of 1 byte of the sub-round data, based on a first table by which a result same as performing a predetermined process is output, to generate converted data of 4 bytes; and an exclusive OR calculator that calculates exclusive OR of the converted data of the sub-round data, respectively, the predetermined process including an encryption process or a decryption process using at least a part of key data prepared for a second round process which is performed later than the first round process.
A data processing apparatus that encrypts or decrypts data by Advanced Encryption Standard in which first key data is prepared for a first round process and second key data is prepared for a second round process, which is performed later than the first round process, the data processing apparatus comprising:
A data processing method performed by a data processing apparatus that encrypts or decrypts data by Advanced Encryption Standard in which first key data is prepared for a first round process and second key data is prepared for a second round process which is performed later than the first round process, comprising:
A non-transitory computer-readable recording medium having recorded thereon a program that causes a computer, that encrypts or decrypts data by Advanced Encryption Standard in which first key data is prepared for a first round process and second key data is prepared for a second round process which is performed later than the first round process, to execute a data processing method comprising:
Dependencies are inferred from the claim text.