,CCA2 secure biometric identity based encryption with constant-size ciphertext

• 作 者: Yang YANG Yu-pu HU Le-you ZHANG Chun-hui SUN
• 机 构: Department of Communication Engineering, Xidian University, Xi’an 710071, China;Department of Mathem
• 出 处: 浙江大学学报（英文版）（C辑：计算机与电子）
• 发表日期: 2011年10期
• 关键词: Public key cryptography Identity-based Data security Biometric Encryption

We propose a new biometric identity based encryption scheme (Bio-IBE),in which user biometric information is used to generate the public key with a fuzzy extractor.This is the first Bio-IBE scheme that achieves constant size ciphertext.This is also a scheme that is secure against the adaptive chosen ciphertext attack (CCA2).Details are presented along with a discussion of Shamir’s threshold secret sharing and fuzzy extraction of biometrics,which is based on error correction codes.We also define a security model and prove that the security of the proposed scheme is reduced to the decisional bilinear Diffie-Hellman (DBDH) assumption.The comparison shows that the proposed scheme has better efficiency and stronger security compared with the available Bio-IBE schemes.