Towards a Secure Signature Scheme Based on Multimodal Biometric Technology: Application for IOT Blockchain Network[J] SYMMETRY-BASEL 2020(12) A. Hassen, Oday A. Abdulhussein, Ansam M. Darwish, Saad Othman, Zulaiha Ali Tiun, Sabrina A. Lotfy, Yasmin