Certificate-Based Signcryption Scheme Research Articles

Fully Continuous Leakage-Resilient Certificate-Based Signcryption Scheme for Mobile Communications

Due to the popularity of mobile communication, many computing devices are exposed to remote environments without physical protection so that these devices easily suffer from leakage attacks (e.g., side-channel attacks). Under such leakage attacks, when a computing device performs some cryptographic algorithm, an adversary may acquire partial bits of secret keys participated in this cryptographic algorithm. To resist leakage attacks, researchers offer leakage-resilient cryptography as a solution. A signcryption scheme combines signing and encrypting processes to simultaneously provide both authentication and confidentiality, which is an important cryptographic primitive. Indeed, many leakage-resilient signcryption schemes under various public key system (PKS) settings were proposed. Unfortunately, these schemes still have two shortcomings, namely, bounded leakage resilience and conditionally continuous leakage resilience. In this paper, a “fully” continuous leakage-resilient certificate-based signcryption (FCLR-CBSC) scheme is proposed. Security analysis is formally proved to show that our scheme possesses both authentication and confidentiality against two types of adversaries in the certificate-based PKS setting. Performance analysis and simulation experience show that our scheme is suited to run on both a PC and a mobile device.

Certificate-Based Signcryption Scheme for Securing Wireless Communication in Industrial Internet of Things

The Industrial Internet of Things (IIoT) community is concerned about the security of wireless communications between interconnected industries and autonomous systems. Providing a cyber-security framework for the IIoT offers a thorough comprehension of the whole spectrum of securing interconnected industries, from the edge to the cloud. Several signcryption schemes based on either identity-based or certificateless configurations are available in the literature to address the IIoT’s security concerns. Due to the identity-based/certificateless nature of the available signcryption schemes, however, issues such as key escrow and partial private key distribution occur. To address these difficulties, we propose a Certificate-Based Signcryption (CBS) solution for IIoT in this article. Hyperelliptic Curve Cryptosystem (HECC), a light-weight version of Elliptic Curve Cryptosystem (ECC), was employed to construct the proposed scheme, which offers security and cost-efficiency. The HECC utilizes 80-bit keys with fewer parameters than the ECC and Bilinear Pairing (BP). The comparison of performance in terms of computation and communication costs reveals that the proposed scheme provides robust security with minimal communication and communication costs. Moreover, we used Automated Validation of Internet Security Protocols and Applications (AVISPA) to assess the security toughness, and the results show that the proposed scheme is secure.

Continuous leakage-resilient certificate-based signcryption scheme and application in cloud computing

Leakage of private information, e.g. the secret keys, has become a serious threat to the security of computing systems. It has become a common requirement that real-world security applications should withstand various leakage attacks, such as side-channel attacks, cold-boot attacks, etc. For example, the above leakage attacks are very common in cloud computing nowadays. Hence, we need a novel method to protect the security of data storage and authorization even if a certain amount of leakage information with respect to the secret state can be obtained by any adversary. In order to achieve the above goal, in this paper, we introduce a continuous leakage-resilient certificate-based signcryption (CBS) scheme, and we prove that our proposed scheme achieves the chosen-ciphertext attacks (CCA) security based on the discrete logarithm assumption and the decisional Diffie-Hellman assumption. Our proposed scheme not only has the ability to resist the continuous leakage attacks, but also enjoys very low computational overheads. Moreover, two concrete continuous leakage-resilient data storage and authorization protocols are generated from the above continuous leakage-resilient CBS scheme: one has a single key generation center and the other generates the keys in a distributed form. Therefore, our protocols with continuous leakage resilience are particularly suitable for data storage and authorization in cloud computing system.

Certificate-Based Signcryption Scheme without Pairing: Directly Verifying Signcrypted Messages Using a Public Key

To achieve confidentiality, integrity, authentication, and non-repudiation simultaneously, the concept of signcryption was introduced by combining encryption and a signature in a single scheme. Certificate-based encryption schemes are designed to resolve the key escrow problem of identity-based encryption, as well as to simplify the certificate management problem in traditional public key cryptosystems. In this paper, we propose a new certificate-based signcryption scheme that has been proved to be secure against adaptive chosen ciphertext attacks and existentially unforgeable against chosen-message attacks in the random oracle model. Our scheme is not based on pairing and thus is efficient and practical. Furthermore, it allows a signcrypted message to be immediately verified by the public key of the sender. This means that verification and decryption of the signcrypted message are decoupled. To the best of our knowledge, this is the first signcryption scheme without pairing to have this feature.

Provably Secure Certificate-Based Signcryption Scheme without Pairings

Certificate-based cryptography is a new cryptographic paradigm that provides an interesting balance between identity-based cryptography and traditional public key cryptography. It not only simplifies the complicated certificate management problem in traditional public key cryptography, but also eliminates the key escrow problem in identity-based cryptography. As an extension of the signcryption in certificate-based cryptography, certificate-based signcryption provides the functionalities of certificate-based encryption and certificate-based signature simultaneously. However, to the best of our knowledge, all constructions of certificate-based signcryption in the literature so far have to be based on the costly bilinear pairings. In this paper, we propose a certificate-based signcryption scheme that does not depend on the bilinear pairings. The proposed scheme is provably secure in the random oracle model. Due to avoiding the computationally-heavy paring operations, the proposed scheme significantly reduces the cost of computation and outperforms the previous certificate-based signcryption schemes.

Efficient certificate-based signcryption secure against public key replacement attacks and insider attacks.

Signcryption is a useful cryptographic primitive that achieves confidentiality and authentication in an efficient manner. As an extension of signcryption in certificate-based cryptography, certificate-based signcryption preserves the merits of certificate-based cryptography and signcryption simultaneously. In this paper, we present an improved security model of certificate-based signcryption that covers both public key replacement attack and insider security. We show that an existing certificate-based signcryption scheme is insecure in our model. We also propose a new certificate-based signcryption scheme that achieves security against both public key replacement attacks and insider attacks. We prove in the random oracle model that the proposed scheme is chosen-ciphertext secure and existentially unforgeable. Performance analysis shows that the proposed scheme outperforms all the previous certificate-based signcryption schemes in the literature.

Certificate-based signcryption with enhanced security features

Certificate-based cryptography overcomes the inherent shortcomings in traditional public key cryptography and identity-based cryptography. It provides effective mechanisms to design efficient public key cryptography systems with less reliance on underlying infrastructure. As a classic primitive in public key cryptography, signcryption performs signature and encryption in a single logical step, by integrating confidentiality, integrity, authentication and non-repudiation much more efficiently than the traditional sign-then-encrypt approach. In this paper, we first define an enhanced security model for certificate-based signcryption. We then analyze an existing certificate-based signcryption scheme, and show that it is insecure due to two classic attacks. Furthermore, we propose a new certificate-based signcryption scheme. Our scheme is proven secure against adaptive chosen ciphertext attacks and adaptive chosen message attacks in the random oracle model.

Efficient Certificate-Based Signcryption Scheme from Bilinear Pairings

Signcryption is a public key cryptographic primitive that performs digital signature and public key encryption simultaneously, at lower computational costs and communication overheads than the signature-then-encryption approach. In this paper, an efficient certificate-based signcryption scheme based on bilinear pairings is proposed. As compared to traditional and identity-based signcryption schemes, the proposed scheme has the following advantages: it provides implicit certification; it does not have the private key escrow feature of identity-based signcryption schemes. we also analyze the proposed scheme from security and performance points of view.