Patent · US Active

Microprocessor with on-the-fly switching of decryption keys

US9911008B2 · kind B2 · utility

4Cited by

34References

15Claims

0Family size

Assignee

VIA Technologies, Inc. · TW

Inventors

G. Glenn Henry · Austin, US
Terry Parks · Austin, US
Brent Bean · Austin, US
Thomas A. Crispin · Austin, US

Key dates

Filing date	Oct 15, 2015
Grant date	Mar 6, 2018
Priority date	—
Expiry date	Dec 31, 2035

Classification

Technology area (CPC H)Electricity
CPC primaryH04L2209/20
WIPO fieldComputer technology
WIPO sectorElectrical engineering

Abstract

A microprocessor is provided in which an encrypted program can replace the decryption keys that are used to decrypt sections of the encrypted program. The microprocessor may be decrypting and executing a first section of the encrypted program when it encounters, decrypts, and executes an encrypted store-key instruction to store a new set of decryption keys. After executing the store-key instruction, the microprocessor decrypts and executes a subsequent section of the encrypted program using the new set of decryption keys. On-the-fly key switching may occur numerous times with successive encrypted store-key instructions and successive sets of encrypted instructions.

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