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Some lattice attacks on DSA and ECDSA

APPLICABLE ALGEBRA IN ENGINEERING COMMUNICATION AND COMPUTING 2011年第5-6期22卷 347-358页

作者： Poulakis, Dimitrios Aristotle Univ Thessaloniki Dept Math Thessaloniki 54124 Greece

In this paper, using the LLL reduction method and computing the integral points of two classes of conics, we develop attacks on DSA and ECDSA in case where the secret and the ephemeral key of a signed message or theirs modular inverses are sufficiently small and in case where the ephemeral keys or theirs modular inverses of two signed messages are sufficiently small.

关键词： Public key cryptography digital signature algorithm Elliptic curve algorithm LLL Discrete logarithm Diophantine equations

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A SECURE CONFERENCE KEY PROTOCOL OVER ECC-BASED GREY SYSTEMS

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INTERNATIONAL JOURNAL OF INNOVATIVE COMPUTING INFORMATION AND CONTROL 2011年第10期7卷 5717-5730页

作者： Chen, Tzer-Long Chung, Yu-Fang Lin, Frank Y. S. Natl Taiwan Univ Dept Informat Management Taipei 10617 Taiwan Tunghai Univ Dept Elect Engn Taichung 40704 Taiwan

In the current environment, there are only a limited number of third-parties that general users can trust in terms of authentication and verification. Often, the self-acclaimed independent third-parties are the parties from where information outflow occurs. While current public key encryption systems have numerous algorithms that have been protecting confidential data for several years, these systems are often met with hardware difficulties for information protection on the Internet and commercial applications. In order to meet the various needs of the environment, often several cryptography modules are combined or merged to achieve the effect of covering each others' deficiencies. This is a very common practice. The proposed method in this article is applicable for preventing information outflow with the introduction of third parties during a bi-party communication, in circumstances where bi-party communication is met with network environment difficulties, and also when the third party is not a trusted controller, or there are no controllers at all. While current systems operate on the back of trusted third-party administrators as is a common security mechanism for managing the public key and confidential data, often even with management, there are still probabilities of insecurity that threaten system security on the whole. To prevent this and also adapt to environment needs, the proposed method combines the grey system theory with the ECC method. This method can verify the credibility of senders' identity when the legitimate third party is no longer trusted, thus preventing malicious third-party intrusions. The concept of this method is based on the well-known digital signature algorithm (DSA) concept from which the Diffie-Hellman Key Agreement mechanism is derived to manage a common conference key in a mutual communication, agreement. When the user can communicate mutually between themselves without the need for a third-party intermediary, the solution to interv

关键词： Conference key Elliptic curve cryptosystem digital signature algorithm Grey system

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Design of Hyper Elliptic Curve digital signature

Design of Hyper Elliptic Curve Digital Signature

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International Conference on Information Technology and Computer Science

作者： Deng Jian-zhi Cheng Xiao-hui Gui Qiong Guilin Univ Technol Dept Elect & Comp Sci Guilin Peoples R China

ISBN: (纸本)9780769536880

In computer cryptography, Hyper elliptic curve cryptography system is one of the best cryptography system. DSA signature algorithm is also an advanced digital signature algorithm. In this paper, it's banded hyper elliptic curve cryptography system and DSA signature standard together based on analysis and study them. The digital signature algorithm and the digital validate algorithm are analysis and improved. The hyper elliptic curve cryptography system is transplanted into DSA algorithm. And a digital signature based on HEC-DSA system is implemented. QuartusII is used to generate the function modules, RTL circuit and simulated waveform. RTL is the circuit connection in chip. It shows the connection of the modules. Simulated waveform shows us the timing and the function of the system. The security and efficiency of the HEC-DSA digital signature system is analyzed. The digital signature designed in this paper can solved the problem that how to check integrality of the rile and signature ID, and it especially fit for the internet operation that need identity validate.

关键词： hyper elliptic curve digital signature algorithm digital signature secure hash algorithm

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Forward-Secure Proxy signature Scheme for Multiple Proxy Signers using DSA with Proxy Revocation

Forward-Secure Proxy Signature Scheme for Multiple Proxy Sig...

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IEEE International Advance Computing Conference

作者： Sunitha, N. R. Amberker, B. B. Siddaganga Inst Technol Dept Comp Sci & Engn Tumkur Karnataka India Natl Inst Technol Dept Comp Sci & Engn Warangal Andhra Pradesh India

ISBN: (纸本)9781424429271

A proxy signature scheme allows one user to delegate his/her signing capability to another user called a proxy signer in such a way that the latter can sign messages on behalf of the the former. After verification the verifier is convinced of the original signer's agreement on the signed message. Like digital signatures, these proxy signatures are also vulnerable to leakage of proxy secret key. Forward-Secure signatures enable the signer to guarantee the security of messages signed in the past even if his secret key is exposed today. By applying the concept of Forward-Security to proxy signatures, we have come up with a forward secure proxy signature scheme based on DSA(digital signature algorithm). Compared to existing schemes, the special feature of our scheme is that an original signer can delegate his signing capability to any number of proxy signers in varying time periods. Though the original signer gives proxy information to all the proxy signers at the beginning of the protocol, the proxy signers will be able to generate proxy signatures only in their allotted time periods. Further., the proxy signatures are made forward-secure. Moreover, our scheme meets the basic requirements of a proxy signature scheme along with proxy revocation. Both on-demand proxy revocation i.e. whenever the original signer wants to revoke the proxy signer and automatic proxy revocation i.e. immediate revocation after the expiry of the time period of the proxy signer, is provided. Additional properties of our scheme are as follows: identity of the proxy signer is available in the information sent by original signer to proxy signer, original signer need not send the information to proxy signer through a secure channel, warrant on the delegated messages can be specified, original signer cannot play the role of proxy signer, and verifier can determine when the proxy signature was generated.

关键词： Proxy signature Forward-Security Proxy revocation Public key digital signature algorithm

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Strong Diffie-Hellman-DSA key exchange

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IEEE COMMUNICATIONS LETTERS 2007年第5期11卷 432-433页

作者： Jeong, Ik Rae Kwon, Jeong Ok Lee, Dong Hoon Elect & Telecommun Res Inst ETRI Taejon 305606 South Korea Korea Univ CIST Grad Sch Informat Secur Seoul 136701 South Korea

To provide authentication to the Diffie-Hellman key exchange, a few integrated key exchange schemes which provide authentication using the DSA signature have been proposed in the literature. In this letter we point out that all of the previous Diffie-Heliman-DSA schemes do not provide security against session state reveal attacks. We also suggest a strong Diffie-Hellman-DSA scheme providing security against session state reveal attacks as well as forward secrecy and key independence.

关键词： cryptography Diffie-Hellman key exchange digital signature algorithm

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Implementation of elliptic-curve cryptography on mobile healthcare devices

Implementation of elliptic-curve cryptography on mobile heal...

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IEEE International Conference on Networking, Sensing and Control

作者： Malhotra, K. Gardner, S. Patz, R. Univ Glamorgan Fac Adv Technol Ctr Elect Prod Engn Pontypridd CF37 1DL M Glam Wales

ISBN: (纸本)9781424410750

Over the past few years, much research attention has been afforded to the application of remote patient monitoring using embedded mobile devices. However, relatively little research has been done to investigate the security aspects of such scenarios. The present work describes the implementation of a cryptographic algorithm based on Elliptic curves on an embedded mobile device useful for healthcare purposes. A Personal digital Assistant (PDA) has been chosen to be the hardware platform for the implementation as it is particularly suitable for remote patient monitoring applications. The motivation for this paper was to formulate a secure protocol which comprises of signature, Encryption and Authentication (SEA) as a combined ingredient of secure remote patient monitoring application using mobile devices. This needed to be easy to use and computationally efficient in order to be acceptable to both clinicians and patients and the results indicate a positive outcome.

关键词： mobile device security cryptographic techniques elliptical curve cryptography digital signature algorithm remote patient monitoring applications

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Improved DSA variant for batch verification

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APPLIED MATHEMATICS AND COMPUTATION 2005年第1期169卷 75-81页

作者： Lin, CH Hsu, RH Harn, L Tunghai Univ Dept Comp Sci & Informat Engn Taichung 407 Taiwan Univ Missouri Dept Comp Networking Kansas City MO 64110 USA

Batch verification is a method to verify multiple signatures at once. There are two issues associated with batch verification. One is the security problem and the other is the computational speed. In 1998, Bellare et al. have proposed an approach called small exponents test, to preserve the security of batch verification of a digital signature algorithm (DSA) variant. In this letter, we propose an efficient scheme to speed up DSA batch verification. Our scheme does not need to compute modular inverse and at the same time, the security is preserved. We have included the performance evaluation to compare Computational time between our scheme and the existed DSA batch verification. (c) 2004 Elsevier Inc. All rights reserved.

关键词： digital signature algorithm batch verification small exponent test inverse computation signature verification

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Efficient sub-band coding in JPEG2000 for improved authentication and tamper-proofing

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IMAGING SCIENCE JOURNAL 2004年第3期52卷 181-187页

作者： Chen, J Chen, TS Chen, JG Hungkuang Univ Dept Comp Sci & Informat Management Taichung 43309 Taiwan Natl Taichung Inst Technol Dept Informat Management Taichung 404 Taiwan

The LL sub-band from the discrete wavelet transform in JPEG2000 is similar to a smaller image of the original in spatial domain. The proposed authentication and tamper-proofing scheme is to extract and hide the entire LL sub-band into the first-level sub-bands, 1LH and 1HL. The hidden data are used later with a unique digital signature and a public key to prove the authenticity of the image. Tampered areas could be accurately detected and recovered to a quality that is visually acceptable. This scheme can be used to authenticate sensitive images, such as medical images, to prove rightful ownership and to recover images before originals are available.

关键词： JPEG2000 digital signature algorithm distortion reduction special characteristic values

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Multiparty DSA signature generation without simultaneous user operations

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IEICE TRANSACTIONS ON INFORMATION AND SYSTEMS 2004年第8期E87D卷 2095-2105页

作者： Sameshima, Y Saisho, H Oyanagi, K Matsumoto, T Hitachi Software Engn Co Ltd R&D Tokyo 1400002 Japan Inst Informat Secur Yokohama Kanagawa 2210835 Japan Yokohama Natl Univ Grad Sch Environm & Informat Sci Yokohama Kanagawa 2408501 Japan

The authors present a multiparty signature generation (MSG) scheme of the digital signature algorithm (FIPS 186-1). The scheme is based on a simple idea, however, it is much more convenient in usability in the real world than existing MSGs. The scheme has the following properties: (1) valid signatures are generated with odd n split private keys, (2) broadcast messages between the key holders are hidden from them, so that the n key holders do not need to process signature generation simultaneously, (3) even if up to t(= n-1/2) split keys are stolen, the adversary can get no information on the private key, (4) the scheme is as secure as the original signature algorithm against chosen message attack, and (5) the scheme is efficient in the sense that an implementation on smart card has demonstrated practical performance for interactive use with human user.

关键词： threshold multisignature digital signature algorithm multiparty protocol cryptography information security

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Efficient sub-band coding in JPEG2000 for improved authentication and tamper-proofing

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The Journal of Photographic Science 2004年第3期52卷 181-187页

The LL sub-band from the discrete wavelet transform in JPEG2000 is similar to a smaller image of the original in spatial domain. The proposed authentication and tamperproofing scheme is to extract and hide the entire LL sub-band into the first-level sub-bands, 1LH and 1HL. The hidden data are used later with a unique digital signature and a public key to prove the authenticity of the image. Tampered areas could be accurately detected and recovered to a quality that is visually acceptable. This scheme can be used to authenticate sensitive images, such as medical images, to prove rightful ownership and to recover images before originals are available.

关键词： JPEG2000 digital signature algorithm DISTORTION REDUCTION SPECIAL CHARACTERISTIC VALUES

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