赖俊祚，信息学院计算机系研究员、博士生导师，广东省“珠江人才计划”引进创新创业团队核心成员。主持国家自然科学基金、广东省自然科学基金杰出青年基金等项目。研究方向为密码学与信息安全。在EUROCRYPT、PKC、ESORICS、IEEE TIFS、IEEE TDSC、ACM TISSEC等密码学和信息安全国际会议和期刊发表30多篇论文。
Nowadays it is well known that randomness may fail due to bugs or deliberate randomness subversion. As a result, the security of traditional public-key encryption (PKE) cannot be guaranteed any more. Currently there are mainly three approaches dealing with the problem of randomness failures: deterministic PKE, hedged PKE, and nonce-based PKE. However, these three approaches only apply to dierent application scenarios respectively. Since the situations in practice are dynamic and very complex, it's almost impossible to predict the situation in which a scheme is deployed, and determine which approach should be used beforehand. We initiate the study of hedged security for nonce-based PKE, which adaptively applies to the situations whenever randomness fails, and achieves the best-possible security.