Involvement of Users in Software Requirement Engineering

Blind signature schemes, as important cryptographic primitives, are useful protocols that guarantee the anonymity of the participants. In this paper, a new blind signature based on the strong RSA assumption is presented. The new blind signature scheme is quite efficient and statefree. It does not require the signer to maintain any state and can be proven secure against adaptive chosen message attack under a reasonable tractability assumption, the so-called Strong RSA assumption. Moreover, a hash function can be incorporated in to the scheme in such a way that it is also secure in the random oracle model under the standard RSA assumption.

Ijca Proceedings on International Conference on Emergent Trends in Computing and Communication, 2014

Internet has become an Integral part and prime need of every human being in their day to day life. People now prefer to do transaction over the internet than doing it offline as it reduces time consumption. In such scenarios, securing customer data is one of the biggest challenges for software developers. For this reason Security protocols like Blind Signature Scheme came into picture where requester is allowed obtain a signature from the signer who signs a message without reading the content of the message, and cannot link the protocol with the resulting message signature pair. Blind Signature scheme is mostly used for E-commerce applications like Digital payment system, Electronic-voting system as it provides security goals like blindness, untraceability, correctness and nonforgeability. Neal Koblitz and Victor S. Miller has presented Elliptic curve cryptography (ECC) which is an approach to public key cryptography based on algebraic structure of elliptic curves in over finite fields. Elliptic curve cryptosystem is more efficient than other public key cryptosystem due to difficulty in solving elliptic curve discrete logarithm problem. Using the benefits of elliptic curve cryptography we have presented implementation of blind signature scheme using JAVA.

International Journal of Innovation, Management and Technology, 2014

Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, 2017

Blind signature is an interesting cryptographic primitive which allows user to get signature on his document from signatory authority, without leaking any information. Blind signature is useful in many e-commerce applications where user's anonymity is the main concern. Since the Zhang et al., was the first to propose the identity based blind signature, many schemes based on bilinear pairing have been proposed. But the computational cost of pairing operation on elliptic curve is around 20 times the point multiplication on an elliptic curve. In order to save the running time, we present a new Identity-Based Blind Signature (ID-BS) scheme whose security is based on elliptic curve discrete logarithm problem (ECDLP). Performance comparison shows that proposed scheme reduces the cost of computation. Security analysis shows that proposed scheme is secure against the adversary and achieves the property of blindness and Non-forgeabillity. At the end; we propose an e-cash payment system based on our ID-based blind signature scheme.

2021

Blind signatures provide authenticity, integrity, nonrepudiation, blindness and untraceability of the message contents. In blind signature, the signer signs the message without revealing the contents of a message. Certificateless blind signature scheme is the combination of certificateless scheme and blind signature scheme. In certificateless blind signature scheme there is no need of certificates to verify the authenticity of the public key of user. In this research, the “Certificatrless blind signature scheme using ECC” of Nayak et al is analyzed. The analysis shows that the proposed certificateless blind signature scheme is not secure against the known cryptanalysis attacks. In fact, an attacker can easily reveal the secret key of the signer by mounting a forgery attack and can become a fake signer. After a successful cryptanalysis, a modified version of the scheme is presented. In the modified version of the scheme, the elliptic curve encryption and decryption is introduced in t...

2013

In this paper, we propose a blind signature scheme and three practical educed schemes based on elliptic curve discrete logarithm problem. The proposed schemes impart the GOST signature structure and utilize the inherent advantage of elliptic curve cryptosystems in terms of smaller key size and lower computational overhead to its counterpart public key cryptosystems such as RSA and ElGamal. The proposed schemes are proved to be secure and have less time complexity in comparison with the existing schemes.

2015

Abstract: Proxy partially blind signature allows a proxy signer to explicitly embed presaged common information c into the blind signature without loss of blindness property. The focus of this paper is to present the efficient stamped proxy partially blind signature (SPPBS) scheme based on elliptic curve discrete logarithm problem (ECDLP) with collision-resistant cryptographic hash function which records the time stamp during signing phase of the proxy partially blind signature and to allow the original signer to revoke delegating power whenever necessary The proposed scheme satisfies all the security properties of proxy blind signature, i.e. distinguishability, nonrepudation, unforgeability, identifiability, unlinkability, and prevention of misuse. Furthermore, the proposed scheme requires minimal operation in proxy delegation, partially blinding, signing extraction and verification thus makes it very efficient. This can be implemented in low power and small processor handheld devi...

International Journal of Computer Applications, 2013

Security of the consumer"s data over internet is the major problem in present time. In this paper we have analyzed blind signature schemes based on RSA and with taking advantage of elliptic curve cryptography to achieve the security goals. Blind signature scheme is one of the security protocol to obtain signature from a signer such that signer sign the message without reading the content of the message and also he could not link the protocol with the resulting message signature pair [7]. Blind signature scheme is used to achieve certain security goals like blindness, untraceability, authenticity, unforgeability [1]. We have analyzed blind signature scheme to achieve the security goals using Elliptic Curve Cryptosystem. Elliptic curve cryptography (ECC) is an approach to public-key cryptography based on the algebraic structure of elliptic curves over finite fields. The use of elliptic curves in cryptography was initially presented by Neal Koblitz and Victor S. Miller. Elliptic curve cryptosystem has advantages in terms of smaller key size and lower computational overhead in comparison with public key cryptosystem [2]. Many researchers have been presented the secure blind signature scheme with their own goals and limitations. Two properties a blind signature scheme should hold digital signature and blind signature. By using concept of Elliptic Curve Cryptosystem and blinding algorithm, the signer generates the blind signature without reading content of the message [5]. The scheme avoids the collision between different digital signatures generated by the same singer. The blind signature is a secure technique can be applied in ebusiness and other applications. Blind signature schemes are widely used for various applications of E-commerce like digital payment systems and electronic voting system etc where to maintain the privacy of consumer is necessary [9].

2023

Blind digital signature schemes allow for digital documents to be signed and verified without revealing the contents of the document to the signer. This paper provides a brief introduction to blind digital signatures and surveys several of their uses in data privacy applications, including e-voting, anonymous e-cash, and e-healthcare. For concreteness, RSA-based signatures are considered in some detail.

A proxy blind signature scheme is a special form of blind signature which allows a designated person called proxy signer to sign on behalf of two or more original signers without knowing the content of the message or document. It combines the advantages of proxy signature, blind signature and multi-signature scheme and satisfies the security properties of both proxy and blind signature scheme. Most of the exiting proxy blind signature schemes were developed based on the mathematical hard problems integer factorization (IFP) and simple discrete logarithm (DLP) which take sub-exponential time to solve. This paper describes an secure simple proxy blind signature scheme based on Elliptic Curve Discrete Logarithm Problem (ECDLP) takes fully-exponential time. This can be implemented in low power and small processor mobile devices such as smart card, PDA etc. Here also we describes implementation issues of various scalar multiplication for ECDLP