Samsung Electronics Co., Ltd.

Chae-hoon Lim

Kyung-Hee Lee

Tymur Korkishko

Bae-eun Jung

Kazunori Kashimura

I-hwa Choi

Pil-joong Lee

An image pickup apparatus includes a main body having an image sensor, a flash apparatus having a flash unit installed to the main body to selectively protrude from the main body and to rotate in the protrusion, and a controller to determine whether to protrude the flash unit by determining whether the main body is disposed in an indoor location or in an outdoor location through an image sensor and locating a face of a person in a subject captured by the image sensor, and to control a flash direction by rotating the flash unit in accordance with surroundings of the face of the person in the subject image after protruding the flash unit.

Image pickup apparatus, flash apparatus usable with image pickup apparatus, and control method of image pickup apparatus

A portable composite apparatus and a method of controlling photographing modes. The portable composite apparatus includes a decision unit to decide whether current time information is included in a time range corresponding to a current photographing mode by referring to a prestored time information table, and an operation control unit to change priority levels of photographing modes based on the decision result from the decision unit and the time information table. As photographing modes of the portable composite apparatus are prioritized differently based on the current time information and the time information table, user convenience and expedition of operating (or setting) a desired photographing mode can be enhanced.

Portable composite apparatus and method of controlling photographing modes

An elliptic curve cryptography method which generates a public key for use in a communication encryption using an elliptic curve, including: changing a number of a secret key (d) of (k) bits to an odd number; encoding the secret key to yield an encoded secret key (d) in which a most significant bit (MSB) is (1) and a rest positional number is (1) or (&#x2212;1); and computing the public key (Q=Dp) by multiplying the encoded secret key (d) by a predetermined point (P) on the elliptic curve by a scalar multiplication.

Cryptographic method capable of protecting elliptic curve code from side channel attacks

An encryption and decryption apparatus includes a round key generator generating at least one round key for iterative operations in each of a plurality of rounds using an input key for one of the encryption and decryption; an initial round key adder receiving a plurality of divided parts of an input data, consecutively receiving a plurality of parts of an initial round key which is output from the round key generator for an initial round and corresponds to each of the divided input data, and adding the input data and the corresponding part of the initial round key; a first operator receiving a first data which is output from the initial round key adder and a part of the round key which is output from the round key generator and performing operations for one of the encryption and decryption; a second operator receiving a second data which is output from the initial round key adder and another part of the round key which is output from the round key generator, and performing operations for one of the encryption and decryption; and a register part temporarily storing the first data which is output from the first operator and the second data which is output from the second operator, inputting the first and second data to the first and second operators, respectively, for operations of a next round among the plurality of the rounds, and outputting an encrypted or decrypted data when the plurality of the rounds are completed.

Apparatus and method of performing AES Rijndael algorithm

The present invention relates to an improved method for performing modular exponentiation to a fixed base element. The method includes exponentiating a first digital input signal g by a second digital input signal R, where g is a fixed signal unique to a cryptographic system and R is a randomly generated digital signal, to compute a third digital signal g.sup.R. The exponentiating includes pre-computing and storing a plurality of values depending only upon the fixed signal g in a plurality of memory locations within a computing device and then speeding up the computation of g.sup.R using the stored values. The invented exponentiation method can substantially reduce the amount of computation required to compute the value for g.sup.R. Exponentiation methods according to embodiments of the present invention may be used in a variety of cryptographic systems, e.g., Schnorr identification scheme, Digital Signature Standard (DSS), and Diffie-Hellman key agreement scheme, etc.

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Seoul, South Korea

Chae-hoon Lim