Adjustable proxy re-encryption

US9537838B2 · kind B2 · utility

Assignee

• SAP SE · DE

Inventors

• Isabelle Hang · Darmstadt, DE
• Florian Kerschbaum · Walldorf, DE
• Mathias Kohler · Blankenloch, DE
• Martin Haerterich · Wiesloch, DE
• Florian Hahn · Karlsruhe, DE
• Axel Schroepfer · Heidenau, DE
• Walter Tighzert · Heidelberg, DE
• Andreas Schaad · Bruchsal, DE

Key dates

• Filing date: Dec 22, 2014
• Grant date: Jan 3, 2017
• Expiry date: Feb 24, 2035

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04L63/0807
• WIPO field: Digital communication
• WIPO sector: Electrical engineering

Abstract

Methods, systems, and computer-readable storage media for proxy re-encryption of encrypted data stored in a first database of a first server and a second database of a second server. Implementations include actions of receiving a first token at the first server from a client-side computing device, providing a first intermediate re-encrypted value based on a first encrypted value and the first token, transmitting the first intermediate re-encrypted value to the second server, receiving a second intermediate re-encrypted value from the second server, the second intermediate re-encrypted value having been provided by encrypting the first encrypted value at the second server based on a second token, providing the first encrypted value as a first re-encrypted value based on the first intermediate re-encrypted value and the second intermediate re-encrypted value, and storing the first re-encrypted value in the first database.