Systems, methods, and program products for providing secure authentication for electronic messages are disclosed. A method may comprise generating an asymmetric private key based at least in part upon an invariant biometric feature vector derived from an input biometric reading. The private key may be further based at least in part upon a user password. The resulting private key may not be stored but rather may be generated when required to authenticate an electronic message, at which time it may be used to provide a digital signature for the electronic message. The private key may be deleted after use. The private key may be regenerated by inputting both a new instance of the biometric reading as well as a new instance of the password.