Key revocation and ciphertext update are two prominent security requirements for identity-based encryption systems from a practical view. Several solutions to offer efficient key revocation or ciphertext update for identity-based encryption systems h
To use biometrics identities in an identity based encryption system, Sahai and Waters first introduced the notion of fuzzy identity based encryption (FIBE) in 2005. Yang et al. extended it to digital signature and introduced the concept of fuzzy iden
