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Analysis and Improvement of Differential Computation Attacks against Internally-Encoded White-Box Implementations
white-box cryptography internal encoding differential computation analysis
2019/1/29
White-box cryptography is the last security barrier for a cryptographic software implementation deployed in an untrusted environment. The principle of internal encodings is a commonly used white-box t...
Valiant's Universal Circuits Revisited: an Overall Improvement and a Lower Bound
Universal Circuits Private Function Evaluation Multiparty Computation
2018/11/7
A universal circuit (UC) is a general-purpose circuit that can simulate arbitrary circuits (up to a certain size nn). At STOC 1976 Valiant presented a graph theoretic approach to the construction of U...
Cryptanalysis and improvement of certificateless aggregate signature with conditional privacy-preserving for vehicular sensor networks
conditional privacy-preserving vehicular sensor networks
2016/7/15
Secure aggregate signature schemes have attracted more concern due to their wide application in resource constrained environment. Recently, Horng et al. [S. J. Horng et al., An efficient certificatele...
Evaluation and Improvement of Generic-Emulating DPA Attacks
generic side-channel attack linear regression cross-validation
2016/3/18
At CT-RSA 2014, Whitnall, Oswald and Standaert gave the
impossibility result that no generic DPA strategies (i.e., without any a
priori knowledge about the leakage characteristics) can recover secre...
An Improvement of Both Security and Reliability for Keccak Implementations on Smart Card
side-channel attacks SHA-3
2016/3/1
As the new SHA-3 standard, the security and reliability of Keccak
have attracted a lot of attentions. Previous works already show that both software
and hardware implementations of Keccak have stron...
Implementation and Improvement of the Partial Sum Attack on 6-round AES
Symmetric Cryptography Cryptanalysis Advanced Encryption Standard
2016/1/25
The Partial Sum Attack is one of the most powerful attacks, independent
of the key schedule, developed in the last 15 years against reduced-round versions
of AES. In this paper, we introduce a sligh...
Cryptanalysis and Improvement on Robust Three-Factor Remote User Authentication Scheme with Key Agreement for Multimedia System
cryptographic protocols Authentication scheme
2016/1/9
A three-factor authentication combines biometrics information with user password and smart card to provide security-enhanced user authentication. An proposed user authentication scheme improved Das’s ...
Cryptanalysis of and Improvement on Biometric-based User Authentication Scheme for C/S System
Cryptographic secret keys Das’s scheme
2016/1/9
Password-based authentication schemes are convenient, but vulnerable to simple dictionary attacks. Cryptographic secret keys are safe, but difficult to memorize. More recently, biometric information h...
Cryptanalysis and Improvement of Identity-based Proxy Multi-signature scheme
Chosen-message attack Bilinear map Digital signature
2015/12/21
Cao-Cao’s recently proposed an identity-based proxy signature scheme
and claim that the scheme is provably secure in random oracle model. In this paper
we have reviewed the scheme and proven that th...
Improvement of Camenisch-Neven-Shelat Oblivious Transfer Scheme
Oblivious transfer deterministic encryption
2014/3/10
In 2007, Camenisch, Neven and Shelat proposed an adaptive oblivious transfer (OT) in which a sender has $N$ messages, of which a receiver can adaptively choose to receive $k$ one-after-the-other. In t...
Lattice-based signature schemes constitute an interesting alternative to RSA and discrete logarithm based systems which may become insecure in the future, for example due to the possibility of quantum...
Improvement of Lin-Tzeng Solution to Yao's Millionaires Problem and Its Cheating Advantage Analysis
Semi-honest assumption Exponentially lifting transform
2014/3/5
In 2005, Lin and Tzeng proposed a solution to Yao's Millionaires problem in the setting of semi-honest parties. At the end of the protocol only the party (Alice) who is responsible for setting up the ...
Cryptanalysis and improvement of a dynamic and secure key management model for hierarchical heterogeneous sensor networks
Cryptanalysis Cryptographic Authentication Network Security
2014/3/6
In 2012, Alagheband and Aref presented a dynamic and secure key manage ment model for hierarchical heterogeneous sensor networks. They proposed a signcryption algorithm which is the main building bloc...
Improvement of One Adaptive Oblivious Transfer Scheme
adaptive oblivious transfer 3-Party Diffie-Hellman assumption
2014/3/10
In 2011, the authors [8] presented an adaptive oblivious transfer (OT) scheme based on Decisional 3-Party Diffie-Hellman (3DDH) assumption. The encryption used in the scheme is a combination of the Bo...
Improvement of One Anonymous Identity-Based Encryption
Anonymous identity-based encryption bilinear groups of composite order
2014/3/10
In 2009, Seo et al. proposed an anonymous hierarchical identity-based encryption (IBE). The ciphertext consists of $(C_1, C_2, C_3, C_4)$, where $C_1$ is the blinded message, $C_4$ is the blinded iden...