Patents by Inventor Young-tae Cha

Young-tae Cha has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 6614909
    Abstract: Modular operations are used to perform encryption/decryption of keys in a public cryptosystem. The modular operations process a first data in parallel with a second data to provide for the processing of the keys for the public key cryptosystem to determine a key for the public key cryptosystem based on the first and second data. Providing the keys in parallel may allow a reduction in the size of the intermediate results generated through the operations performed using the keys. Reducing the size of the intermediate results may allow smaller registers to be used to implement a public key cryptosystem.
    Type: Grant
    Filed: July 8, 1999
    Date of Patent: September 2, 2003
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Seung-suk Ryu, Kyung-hee Lee, Young-tae Cha
  • Patent number: 6314186
    Abstract: The present invention relates to the block cipher algorithm based on the prior Feistel type block cipher algorithm (or similar to DES algorithm). Usually the security of Feistel type block cipher algorithm depends on the structure of its round function. More specifically, the present invention relates to the round function structure of the Feistel type block cipher algorithm, in the instance that the round input data block is divided into 8-bit blocks and the divided sub-blocks are fed, with the combined output data of the previous S-box, into 256×8 S-box, except for the first input sub-data block. The first sub-data block one is directly fed into the first S-box. The total output data block, after these steps, is rotated by 8-bits and this rotated result is the output of the current round function.
    Type: Grant
    Filed: June 11, 1998
    Date of Patent: November 6, 2001
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Chang-hyi Lee, Young-tae Cha
  • Patent number: 5657331
    Abstract: A technique deals with wide classes of cyclic codes for simple burst trapping decoding of almost all bursts of length which approaches twice the maximum guaranteed burst length correcting capability with good burst error correcting and detecting capability. The vector symbol codes achieve the highest burst correcting capability but use very long codes. "Perfect" codes can correct all bursts up to length t, and almost all bursts of length l, where t+1.ltoreq.l.ltoreq.n-k-t, with less than n2.sup.-(t-1) incorrect decoding probability for an n-bit code. The probability of an undetected error for any length burst is less than n2.sup.-(t-1). Shortened "perfect" codes can detect any burst of a double or triple error pattern.
    Type: Grant
    Filed: March 13, 1995
    Date of Patent: August 12, 1997
    Assignees: Samsung Electronics Co., Ltd., John J. Metzner, Young-Tae Cha
    Inventors: John J. Metzner, Young-tae Cha