Rambus subsidiary Cryptography Research (CRI) has signed a license agreement with a major smartphone and tablet manufacturer for the use of CRI’s Differential Power Analysis (DPA) countermeasures patents.

Under the agreement, ongoing royalties will be paid for the use of CRI’s patented innovations.

DPA is a form of attack that involves monitoring variations in electrical power consumption of a target device and then uses advanced statistical methods to derive cryptographic keys or other secrets.

Strong countermeasures to DPA are important for securing mobile devices, bank cards, pay television systems, secure identity products, secure storage media, and other electronic systems and components.

Many of the world’s leading security standards include requirements that devices be protected against DPA and related attacks.

Cryptography Research president and chief scientist Paul Kocher said consumers increasingly rely on their smartphones and tablets to perform financial transactions, store personal data and access premium content.

"Our DPA countermeasures technology is a key part of securing mobile devices to safeguard the data of consumers and content providers worldwide," Kocher said.