The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 08, 2009
Filed:
Mar. 17, 2005
Ku Young Chang, Daejeon, KR;
Mun Kyu Lee, Daejeon, KR;
Hang Rok Lee, Daejeon, KR;
DO Won Hong, Daejeon, KR;
Ju Sung Kang, Seoul, KR;
Hyun Sook Cho, Daejeon, KR;
Kyo IL Chung, Daejeon, KR;
Ku Young Chang, Daejeon, KR;
Mun Kyu Lee, Daejeon, KR;
Hang Rok Lee, Daejeon, KR;
Do Won Hong, Daejeon, KR;
Ju Sung Kang, Seoul, KR;
Hyun Sook Cho, Daejeon, KR;
Kyo Il Chung, Daejeon, KR;
Electronics and Telecommunications Research Institute, Daejeon, KR;
Abstract
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.