Encryption method, program for encryption, memory medium for storing the program, and encryption apparatus, as well as decryption method and decryption apparatus
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United States of America Patent
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May 15, 2007
Grant Date -
Jan 9, 2003
app pub date -
Oct 24, 2001
filing date -
Jul 9, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present invention relates to a cryptosystem. A keystream table [Ks] is a virtual data space. Every data of 1 byte in a secondary ciphertext E.sub.2 provides a vector directional component IR. The data Ks (IR) in the keystream table [Ks] designated by the directional component IR of the vector is recognized as the quantitative component of the vector. By handling a secondary ciphertext E.sub.2 of 1 byte as the address in the keystream table [Ks], the secondary ciphertext E.sub.2 can be recognized as the directional component of the vector. A logical operation for the data Ks (IR) is performed, and the internal vector data V is sequentially replaced every 1 byte. An exclusive OR operation is performed between the internal vector data V and the primary ciphertext E1 for generating a secondary ciphertext E.sub.2.
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