Electronics and Telecommunications Research Institute

Hang Rok Lee

Kyo Il Chung

Hyun Sook Cho

Ku Young Chang

Do Won Hong

Mun Kyu Lee

Ju Sung Kang

A method and apparatus for generating a keystream are provided. The method includes: (a) receiving a bitstream comprised of at least 4 bits; (b) selecting at least two bits from the received bitstream; (c) generating an operation value by performing a predetermined bitwise operation on the bits selected in (b); and (d) determining whether to discard the received bitstream or to output the rest of the received bitstream not selected in (b) according to the operation value. The method and apparatus for generating a keystream are expected to be suitable for a ubiquitous computing and network environment and to provide high security or high efficiency.

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Daejeon, South Korea

Hang Rok Lee