US 2003/0120944 A1Published application

RSA cryptographic processing apparatus for IC card

AssigneeElectronics and Telecommunications Research Institute

InventorsMoo Seop Kim, Ho Won Kim, Yong Je Choi, Young Soo Park, Kyo Il Chung, Heui Su Ryu

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Abstract

Disclosed is an RSA cryptographic processing apparatus capable of performing the fast operating function. A modular multiplication operation or a modular exponentiation operation, i.e., an RSA cryptographic operation, is selectively performed according to a control signal inputted, the modular operation of the data of 512 to 1024 bits is iteratively performed by use of 32-bit operating unit, and the data of 512 to 1024 bits is operated by use of a 32-bit operating unit, thereby minimizing the size of the register storing the data and reducing the size of the cryptographic apparatus, and which the intermediate value generated at the operation process is stored in the internal register instead of the memory, thereby minimizing the times of access to the memory.

Claims29

Dependent claims

An RSA cryptographic processing apparatus for a processor of an IC card system, the apparatus comprising:

a memory for storing a data required for a modular operation in each allocated areas, sequentially supplying the data required for the modular operation by a control signal according to implementation of the modular operation, and storing the result value of the modular operation,
an interfacing unit circuit for transmitting and receiving a control signal and the data required for the modular operation transmitted from the processor of the IC card system;
a control register for storing information to control an operation mode of a cryptographic operation according to the control signal transmitted from the processor to the interfacing unit;
an input register for previously reading and storing a data required for a modular multiplication or a modular exponentiation operation from the memory according to the information stored in the control register;
a modular unit for performing the modular multiplication or modular exponentiation operation required for the cryptographic operation using an internal register by reading a value stored in the input register;
a subtracting unit for compensating the result value calculated by the modular unit;
and
a control unit for storing the control signal transmitted from the processor of the IC card, loading the data from the memory to perform the modular operation according to the control signal, providing the modular unit with the data through the input register, and generating a control signal required for the modular operation.

5 more elements

Dependencies are inferred from the claim text.