摘要
B.Libert and J.Quisquater proposed an identity(ID)-based threshold decryption scheme. This paper found flaw in their security reduction and presented two methods to prove this scheme is resist against chosen-plaintext attack(CPA), based on the weaker model of security known as selective ID-based threshold CPA and the common model known as ID-based threshold CPA respectively.
B. Libert and J. Quisquater proposed an identity （ID）-based threshold decryption scheme. This paper found flaw in their security reduction and presented two methods to prove this scheme is resist against chosen-plaintext attack（CPA）, based on the weaker model of security known as selective ID-based threshold CPA and the common model known as ID-based threshold CPA respectively.
基金
NationalNaturalScienceFoundationofChina(Nos.60303026,60573030,90104005and60303026)andtheFoundationofNLMC(No.51436040405JW0304)
