Results 231 to 240 of about 2,507,070 (273)

Fuzzy conditional proxy re-encryption

Science China Information Sciences, 2012
Weng et al. introduced the notion of conditional proxy re-encryption (C-PRE), whereby only the ciphertext satisfying one condition set by Alice can be re-encrypted by the proxy. To achieve more fine-grained delegation on the condition set, we introduce a new cryptographic primitive called fuzzy conditional proxy re-encryption (FC-PRE) in which we view ...
Liming Fang 0001, Jiandong Wang, Chunpeng Ge 0001, Yongjun Ren   +3 more
openaire   +2 more sources

K-times Proxy Re-encryption

2011 Seventh International Conference on Computational Intelligence and Security, 2011
The traditional proxy re-encryption (PRE) or conditional proxy re-encryption (CPRE) can re-encrypt infinite times on the delegator's cipher text. However many practical applications do not need this property, they prefer the delegator can control on the times the proxy can re-encrypt.
Xu An Wang 0014, Ziqing Wang, Yi Ding, Shujun Bai   +3 more
openaire   +2 more sources

Re-Encryption Verifiability: How to Detect Malicious Activities of a Proxy in Proxy Re-Encryption

2015
In this paper, we introduce a new functionality for proxy re-encryption (PRE) that we call re-encryption verifiability. In a PRE scheme with re-encryption verifiability (which we simply call verifiable PRE, or VPRE), a receiver of a re-encrypted ciphertext can verify whether the received ciphertext is correctly transformed from an original ciphertext ...
Satsuya Ohata, Yutaka Kawai, Takahiro Matsuda 0002, Goichiro Hanaoka, Kanta Matsuura   +4 more
openaire   +3 more sources

Hierarchical conditional proxy re-encryption

Computer Standards & Interfaces, 2012
In this paper, we introduce a new primitive called hierarchical conditional proxy re-encryption (HC-PRE) that enhances the concept of C-PRE by allowing more general re-encryption key delegation patterns. Hierarchical conditional proxy re-encryption (HC-PRE) scheme is the hierarchical extension of conditional proxy re-encryption (C-PRE) where the ...
Liming Fang 0001, Willy Susilo, Chunpeng Ge 0001, Jiandong Wang   +3 more
openaire   +3 more sources

Proxy Re-encryption with Delegatable Verifiability

2016
Proxy re-encryption is a public key encryption technique that allows a proxy to perform re-encryption without exposing the corresponding plaintext. As a result, proxy re-encryption has increased utility, and can be used in a number of fields including cloud computing.
Xiaodong Lin 0001, Rongxing Lu
openaire   +2 more sources

Improved Proxy Re-Encryption With Delegatable Verifiability

IEEE Systems Journal, 2020
Proxy re-encryption cryptosystem enables proxy to re-encrypt the ciphertext and protects the privacy of the corresponding plaintext. Hence, this type of cryptosystem has found tremendous applications in data sharing in cloud computing, email forwarding, securing file systems, and so on.
Yu Zhan, Baocang Wang, Zheng Wang, Tao Pei, Yuan Chen 0008, Quanbo Qu, Zhili Zhang   +6 more
openaire   +1 more source

Adaptively Secure Proxy Re-encryption

2019
A proxy re-encryption (PRE) scheme is a public-key encryption scheme that allows the holder of a key pk to derive a re-encryption key for any other key pk′. This re-encryption key lets anyone transform ciphertexts under pk into ciphertexts under pk′ without having to know the underlying message, while transformations from pk′to pk should not be ...
Georg Fuchsbauer, Chethan Kamath, Karen Klein, Krzysztof Pietrzak   +3 more
openaire   +4 more sources

Multi-Use Unidirectional Proxy Re-Encryption

2011 IEEE International Conference on Communications (ICC), 2011
This paper presents the first multi-use unidirectional proxy re-encryption scheme proven-secure against chosenciphertext attacks and collusion attacks in the standard model. Although our proposal features a linear ciphertext size and decryption time in the number of translations, we emphasize that it is the first multi-use and unidirectional ...
Jun Shao 0001, Peng Liu 0005, Zhenfu Cao, Guiyi Wei   +3 more
openaire   +2 more sources

Proxy Re-encryption from CLE to CBE

2010 International Conference on Computational Intelligence and Security, 2010
In 1998, Blaze, Bleumer, and Strauss propose a kind of cryptographic primitive called proxy re-encryption. In proxy re-encryption, a proxy can transform a ciphertext computed under Alice’s public key into one that can be opene under Bob’s decryption key. In 2007, mainly motivated b making different types of ciphertext circulate smoothly in the network,
Ping Wei 0005, Xu An Wang 0014, Xiaoyuan Yang 0002   +2 more
openaire   +1 more source

Unforgeability of Re-Encryption Keys against Collusion Attack in Proxy Re-Encryption

2011
Proxy re-encryption (PRE) allows a proxy to convert a ciphertext encrypted for Alice (delegator) into a ciphertext for Bob (delegatee) by using a re-encryption key generated by Alice. In PRE, non-transferability is a desirable property that colluding proxies and delegatees cannot re-delegate decryption rights to a malicious user.
Ryotaro Hayashi 0001, Tatsuyuki Matsushita, Takuya Yoshida, Yoshihiro Fujii, Koji Okada   +4 more
openaire   +2 more sources