Proxy re-encryption

About: Proxy re-encryption is a research topic. Over the lifetime, 708 publications have been published within this topic receiving 33624 citations.

A New Identity Based Proxy Re-Encryption Scheme

Abstract: The concept of proxy re-cryptography comes from the work of Blaze, Bleumer, and Strauss in 1998. The goal of proxy re-encryption is to securely enable the re-encryption of ciphertexts from one key to another, without relying on trusted parties. Identity based proxy re-encryption extends proxy re-encryption to the identity based setting. In this paper, we construct an identity based proxy re-encryption (IBPRE) scheme which can achieve master secret secure, while almost all of the previous efficient IBPRE schemes can not.

A secure data transfer mechanism using single-handed re-encryption technique

Abstract: To improve the network security by a cryptographic primitive called proxy re-encryption in which a proxy can transform a ciphertext encrypted under one key without seeing the actual plaintext into an encryption of the same plaintext under another key This cryptographic concept has recently drawn renewed interest Some researchers also showed how to properly define chosen-ciphertext security for the primitive This system supports bidirectional as the translation key allows converting ciphertexts in both directions The proposed concept presents the unidirectional proxy re-encryption schemes with chosen-ciphertext security without using the random oracle idealization In 2008, Libert and Vergnaud presented the first construction of unidirectional proxy re-encryption scheme with chosen-ciphertext security in the standard model The limitation of their scheme is the longer length of original ciphertext and re-encrypted ciphertext In this paper, an improvement is performed in Libert and Vergnaud scheme by improving the security levels of encryption using ASCII values The proposed work additionally outlines Non-Transitive Unidirectional Proxy Re-Encryption (PRE) schemes This paper justifies the strength of this PRE with experimental results

Security Analysis of a Multi-use Identity Based CCA-Secure Proxy Re-encryption Scheme

Abstract: In proxy re-encryption (PRE), a semi-trusted proxy can convert a cipher text originally intended for Alice into one which can be decrypted by Bob, while the proxy can not know the underlying plaintext. In multi-use PRE schemes, the cipher text can be transformed from Alice to Bob and to Charlie and so on. Due to its cipher text transformation property, it is difficult to achieve chosen cipher text security for PRE, especially for multi-use PRE. IBE is a new kind of public-key encryption where the recipient's public key is an arbitrary string that represents the recipient's identity. Identity based proxy re-encryption (IBPRE) is a primitive combing the feature of IBE and PRE. Recently Wang et al. proposed a multi-use unidirectional CCA-secure identity based proxy re-encryption (IBPRE) scheme. Unfortunately, we show their proposal is not CCA-secure in the corresponding security models by giving concrete attacks.

Proxy Re-encryption Systems for Identity-based Encryption.

Abstract: A proxy re-encryption system allows the proxy to transform ciphertexts encrypted under Alice's public key into the dierent cipher- texts that can be decrypted by Bob's secret key. In this paper, we propose new proxy re-encryption systems; one for the transformation from cipher- texts encrypted under a traditional certificate-based public key into the ciphertexts that can be decrypted by an secret key for Identity-Based Encryption, and the other one for the transformation from ciphertexts encrypted in IBE manner into the dierent ciphertexts that can be de-