Encipher method and decipher method
US5103479A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Nov 27, 1990 |
| Grant date | Apr 7, 1992 |
| Priority date | — |
| Expiry date | Nov 27, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L9/0625
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
There are provided an encipher method of enciphering message data made by a microcomputer or the like at a high speed by using encipher keys which have previously been stored in a smart card or the like and a decipher method of deciphering the ciphertext made by the encipher method at a high speed by using the encipher keys. The encipher method and the decipher method are suitable for, particularly, a 32-bit microcomputer and include a process expressed by the function Rot.sub.2 i(x) (i=2, 3, 4) in each process. Rot.sub.2 i(x) is the process to circular shift a data train x of 32 bits to the left or right by 2.sup.i bits (i=2, 3, 4).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.