Patent · US Expired

Method for computer-based encryption and decryption of data

US7505586B2 · kind B2 · utility

7Cited by

5References

12Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventor

Herbert Schmidt · Friedberg, DE

Key dates

Filing date	Dec 20, 2002
Grant date	Mar 17, 2009
Priority date	—
Expiry date	Nov 14, 2025

Classification

Technology area (CPC H)Electricity
CPC primaryH04L9/16
WIPO fieldDigital communication
WIPO sectorElectrical engineering

Abstract

For encrypting a string of data elements from a first value range, a respective data element is combined with a key element by a first computing operation. The resulting combination result may lie outside the first value range. From the combination result, an encrypted data element is then derived by a second computing operation that maps onto a second value range, for example printable 1-byte characters. Decryption is accomplished by combining the encrypted data element with the key element using an inverse computing operation to the second computing operation executed iteratively until a result of an iteration step lies within the first value range.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.