Security analysis of a cancelable iris recognition system based on block remapping

Cancelable biometric systems are designed to provide intrinsic protection for biometric templates in case of a database breach. In this paper a security survey of a cancelable iris recognition system is conducted. It uses block permutation and remapping of the iris texture as a strategy for template protection. Two adjunctive scenarios and their impact on the security of the system are examined. First off it is assumed that an attacker got a hold on a single iris template. In the second scenario it is presumed that multiple templates of the same biometric characteristic are available to an attacker. The scenario of a so called ”Coalition Attack”. The test runs conducted suggest that the system does offer some resistance against a template theft but sacrificing overall system performance and usability for it.