Cryptographic key management for end-to-end communication security

US10903986B2 · kind B2 · utility

Assignee

• Karamba Security Ltd. · IL

Inventors

• Amir Herzberg · Ramat Gan, IL
• Assaf Harel · Ramat HaSharon, IL
• Eli Mordechai · Holon, IL
• Tai Efraim Ben David · Hogla, IL
• Amiram Dotan · Birmingham, US
• David Barzilai · Hod HaSharon, IL
• Itay Khazon · Hod HaSharon, IL

Key dates

• Filing date: Jan 18, 2019
• Grant date: Jan 26, 2021
• Expiry date: Jan 18, 2039

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04W4/70
• WIPO field: Digital communication
• WIPO sector: Electrical engineering

Abstract

Technology can be used for sending and receiving messages on a CAN bus with a plurality of ECUs. The technology can include identifying a first message to send to a receiving ECU from a sending ECU; incrementing a sender-version message counter for the message type; determining to create a second session for the message type in the sending ECU; generating a second sender-version session key to be used during the second session in the sending ECU; and resetting the sender-version message counter. The technology further includes processing the first message using the second sender-version session key, including performing an operation to combine the sender-version message counter with the first message to create a combined message and encoding the combined message using the second sender-version session key to create an encoded message. The technology further includes sending the encoded message to the receiving ECU on the CAN bus.