Payment smart cards with hierarchical session key derivation providing security against differential power analysis and other attacks
US7941666B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 24, 2003 |
| Grant date | May 10, 2011 |
| Priority date | — |
| Expiry date | Nov 12, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2207/7219
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Chip cards are used to secure credit and debit payment transactions. To prevent fraudulent transactions, the card must protect cryptographic keys used to authenticate transactions. In particular, cards should resist differential power analysis and/or other attacks. To address security risks posed by leakage of partial information about keys during cryptographic transactions, cards may be configured to perform periodic cryptographic key update operations. The key update transformation prevents adversaries from exploiting partial information that may have been leaked about the card's keys. Update operations based on a hierarchical structure can enable efficient transaction verification by allowing a verifying party (e.g., an issuer) to derive a card's current state from a transaction counter and its initial state by performing one operation per level in the hierarchy, instead of progressing through all update operations performed by the card.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.