Multi-document threshold signcryption scheme

Abstract

Without proper and well-managed encryption, digital communications interception is technically easy to tap over public networks, and it causes unauthorized disclosure of sensitive information and irreparable harm to individuals as well as organizations. To ensure that digital information remains complete, accessible and secure at all times, it needs to be reliably processed on security measures at both the sending and receiving ends. Signcryption like other aspects of a cryptographic system simultaneously provides the characteristics of both digital signature and encryption and can fulfill the basic security requirements of information confidentiality, integrity and availability in transmission. In this paper, we introduce a threshold signcryption scheme based on elliptic curve cryptography to combine the dynamic knapsack cryptosystem technique with the Chinese remainder theorem and achieve a more robust security cryptosystem for multi-document transmission. With the proposed composition scheme of threshold signcryption function, participants not only can employ the avalanche effect of unsystematic properties founded on the elliptic curve cryptography's point addition to chaotically generate preshared secure cipher keys against the counterfeiting or potential information leakage problems but also apply the advantages of a smaller key size and its high strength of security under the elliptic curve discrete logarithm problem assumption to carry out digital communications, which can be fast and reliably transmitted over a public channel.

New Proxy Blind Signcryption Scheme for Secure Multiple Digital Messages Transmission Based on Elliptic Curve Cryptography

“…The main contribution of our work not only significantly strengthens the principles of provable security which we give the results of security analysis in Section 4, as pointed out by [21] [27] and [28], including unforgeability, non-repudiation and unlinkability, but also innovatively offers a model for proxy-signature-related or blind-signature-related topics on processing multiple digital messages, as exemplified by [37] [38] and [39]; likewise we provide a high-performance solution through a vast amount of digital messages in terms of computational efficiency in Section 5. Another contribution of this study is to show that a direct implementation of this scheme describes a process where ciphertext from one block encryption step gets intermixed with the shifted data point from the next encryption step until the complete sequence of encoded messages is synthesized as an avalanche effect which we present in Section 3.…”

“…Additionally, the proposed scheme maintains all message blocks to produce the avalanche effect as more and more blocks connect to the subsequent segment, and this security measure is able to prevent information leakage from occurring in each time period. It is worthwhile pointing out that a newly unveiled multiple-document cryptosystem from Tsai and Su's recent works [38] [39] in 2015 and 2017, respectively. Of these two signcryption techniques, the former presents a different type of a threshold signcryption protocol by assigning a group of signatures to share a secret link for multiple documents and their study handles a large number of digital documents via a group of participants splitting a secret and each of member is allocated a share of the secret, but the latter introduces an alternative paradigm for a blind signcryption model (viz.…”

An ECC-Based Blind Signcryption Scheme for Multiple Digital Documents

“…We will examine theoretical results of the three different strategies for solving the cryptological operations involved with respect to the costs of computation and communication incurred by each task according to the concept of modular arithmetic operations [31,45]. The notations including scalar multiplication, point addition, hash construction, and modular arithmetic that we used to evaluate the performance are shown in Table 2.…”

“…In the meantime, different participants interact with each other in establishing communication sessions and the session data can leave an identifier stolen more vulnerable to identity theft or protocol attacks (e.g., the man-in-the-middle attack). Moreover, most of the current studies deal with blind signatures in a single message at a time or a batch of multiple signatures on multiple documents [2,30] instead of managing large number of digital documents by making a single signature just once [31]. In the case of handling voluminous amount of documents, gradually performing blind signature processes on multiple electronic documents takes more time than going through the same steps in a single digital document.…”

“…However, all three of the methods do not use a blinding technique but a nonblind cryptographic primitive to offer the support of public verifiability, and hyperelliptic curve cryptography in genus 2 that requires many more field operations in each group operation has the potential to be competitive with its genus 1 elliptic curve cryptography counterpart [41,42]. As for multidocument cryptographic processing using signcryption technique, Tsai and Su [31] present a variant of a threshold signcryption protocol by assigning a group of signatures to share a secret link for multiple documents. Their work handles large number of digital documents via a group of participants splitting a secret and each of the members is allocated a share of the secret, whereas the proposed scheme manages multiple documents by one single person employing a blind signcryption technique along with these messages to enable effective protection measures, for example, the anonymity and untraceability properties.…”