Edward M Rodriguez

US Patent:

20200184111, Jun 11, 2020

Filed:

Feb 18, 2020

Appl. No.:

16/793022

Inventors:

- San Francisco CA, US
Edward L. Rodriguez De Castro - Menlo Park CA, US

International Classification:

G06F 21/72
G06F 21/73
H04L 9/08
H04L 9/06
H04L 9/32
H04L 29/06
G06F 21/78
G06F 12/14
G06F 7/58
G06F 3/06

Abstract:

A cryptographic application-specific integrated circuit (ASIC) and method for autonomously storing context data into a one-time programmable memory in isolation are presented. The stored data describes product environmental history following manufacture, which may assist in assessing of a request for a refund or replacement of a defective product, such as an ASIC. The data may be cryptographically protected for retrieval and validation only by a manufacturer or authorized vendor. In another embodiment, communications between individual integrated circuits in a product may be secured by storing encryption keys as the context data, and exchanging the context data. The context data may be stored during manufacture, or thereafter. Such integrated circuits may be secured against replay attacks that capitalize on loss of context data that occurs when volatile memory is reset through power cycling, and enable inter-chip communications to be managed as are communications between unknown parties in an untrusted network.