MITRE Voice Signature (Voice Sig) is a biometric authentication solution for electronic document signing that serves as the functional equivalent of a traditional handwritten signature. The application combines voice recognition and verification technology with public key encryption and symmetric key encryption to provide secure document signing capabilities. The system is designed to be user-friendly and requires minimal training for users to operate effectively. It incurs minimal back-end infrastructure costs and can be deployed virtually anywhere. The solution supports multiple signers who can be either co-located in the same physical space or geographically dispersed across different locations. Voice Sig uses biometric voice characteristics to verify the identity of document signers, providing a secure alternative to traditional signature methods. The integration of cryptographic techniques with voice biometrics creates a multi-layered security approach for document authentication and non-repudiation.