Protection of biometric data by employing key-dependent sampling Key-dependent sampling of a biometric characteristic is performed at a client (110), to thereby generate key-dependent biometric data samples. The key-dependent biometric data samples a

摘要

Key-dependent sampling of a biometric characteristic is performed at a client (110), to thereby generate key-dependent biometric data samples. The key-dependent biometric data samples are then transmitted from the client (110) to a server (112). By sampling the biometric characteristic at the client (110) in a key-dependent manner, the key-dependent biometric data samples may be transmitted from the client (110) to the server (112) without the need for additional encryption and/or a signature. A key is preferably transmitted from the server (112) to the client (110). The key is then used to perform the key-dependent sampling of the biometric characteristic at the client (110). The key-dependent sampling may be performed by sampling the biometric characteristic at a sampling frequency that is a function of the key. Alternatively, the key can be applied to the sampled biometric data, to thereby generate the key-dependent biometric data samples that are a function of the key. The key is preferably used to perform nonlinear key-dependent sampling of the biometric characteristic at the client (110), for example by using the key to determine the sampling frequency and also using the key to apply a nonlinear function to the sampled biometric data. Further encryption of the biometric data and/or the use of a signature with the biometric data need not be performed. The present invention further relates to a client (110) system for securely transmitting biometric data samples, to a server system for processing biometric data, and a computer program product for securely transmitting biometric data.