Chosen-Ciphertext Secure Certificateless Proxy Re-Encryption

Chosen-Ciphertext Secure Proxy Re-encryption without Pairings

Proxy re-encryption (PRE), introduced by Blaze, Bleumer and Strauss, allows a semi-trusted proxy to convert a ciphertext originally intended for Alice into an encryption of the same message intended for Bob. Proxy re-encryption has found many practical applications, such as encrypted email forwarding, secure distributed file systems, and outsourced filtering of encrypted spam. In ACM CCS’07, Ca...

Chosen-ciphertext secure multi-hop identity-based conditional proxy re-encryption with constant-size ciphertexts

CCA-Secure PRE Scheme without Random Oracles

In a proxy re-encryption scheme, a semi-trusted proxy can transform a ciphertext under Alice’s public key into another ciphertext that Bob can decrypt. However, the proxy cannot access the plaintext. Due to its transformation property, proxy re-encryption can be used in many applications, such as encrypted email forwarding. In this paper, by using the techniques of Canetti-Hohenberger and Kuros...

Group-based Proxy Re-encryption Scheme Secure Against Chosen Ciphertext Attack

The notion of proxy cryptography is very useful in cases when one user needs to perform sensitive operation without holding the necessary secret key. Recently, proxy reencryption scheme received much attention due to its application in information storing, secure email, etc. In this paper, we propose a proxy re-encryption used to divert ciphertext from one group to another. The scheme is bidire...

Secure Certificateless Public Key Encryption without Redundancy

Certificateless public key cryptography was introduced to solve the key escrow problem in identity based cryptography while enjoying the most attractive certificateless property. In this paper, we present the first secure certificateless public key encryption (CLPKE) scheme without redundancy. Our construction provides optimal bandwidth and quite efficient decryption process compared with the e...