Patent · US Active

Method for securely encrypting or decrypting a message

US8300810B2 · kind B2 · utility

5Cited by

2References

8Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Michael Braun · Altensteig, DE
Anton Kargl · Birkenfeld, DE
Bernd Meyer · Munich, DE

Key dates

Filing date	Mar 6, 2008
Grant date	Oct 30, 2012
Priority date	—
Expiry date	Apr 25, 2031

Classification

Technology area (CPC H)Electricity
CPC primaryH04L2209/08
WIPO fieldDigital communication
WIPO sectorElectrical engineering

Abstract

A method for securely encrypting or decrypting a message or for generating or verifying a digital signature in a message, in which the message is subjected, with the aid of a processor, to a mathematical operation using a key (k) which can be represented in the form of a binary number with a sequence of bits, and computational operations are sequentially carried out on auxiliary variables for each bit. The dependence of the computational result on the values of individual bits is taken into account by reading the memory addresses from the auxiliary variables and assigning them to address variables. The difference between the addresses is calculated and, depending on the respective current bit, is added to, or subtracted from, the computer addresses. The assignment of the auxiliary variables to the address variables can thus be interchanged. As a result, the order and selection of the computational operations is controlled on the basis of bits without the program sequence having to contain jump instructions.

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