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:
Oct. 20, 2009
Filed:
Jan. 11, 2005
Mi-jung Noh, Yongin-si, KR;
Kyoung-moon Ahn, Seoul, KR;
Mi-jung Noh, Yongin-si, KR;
Kyoung-moon Ahn, Seoul, KR;
Samsung Electronics Co., Ltd., Gyeonggi-do, KR;
Abstract
A key scheduler, which may selectively generate an encryption round key and a decryption round key corresponding to an initial round key, which may have a variable key length. The key scheduler may include a key storage unit, a key calculating unit, and a key output unit. The key storage unit may receive and store calculation key data items or storage key data items as input key data items, and may output the stored input key data items as the storage key data items. The key calculating unit may output the calculation key data items as the calculation result. The key output unit may select units of the input key data items and the storage key data items in response to output control signals, and may output them as an encryption round key or a decryption round key.