Patents by Inventor Charles M. Doland

Charles M. Doland 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).

  • Encryption technique using stream cipher and block cipher
    Patent number: 6415032
    Abstract: A method is provided for generating a pseudo-random sequence of integers, and the method is applied to the encryption of messages. The method uses a key K and a pair of prime numbers p and q, where q=2p+1. According to one aspect of the invention, a sequence of integers is formed. A sequence of bits is then formed from the sequence of integers, e.g., by selecting the least significant bit from each integer value. The sequence of bits is then used to encrypt a message using a selected encryption algorithm such as the XOR algorithm. Since prime numbers p and q can be selected to be larger than key K, the repeating period of the sequence of integers is larger than that permitted by the bit length of K.
    Type: Grant
    Filed: December 1, 1998
    Date of Patent: July 2, 2002
    Assignee: Xilinx, Inc.
    Inventor: Charles M. Doland