A Survey of Pairing Free Certificateless Signature Schemes for Secure Networking

Technology has enhanced the jeopardy of misuse of individual confidential data and identity theft attacks, where securing the content of communication and confidentiality has become one of the chief requirements. Here Cryptography operates as the cornerstone of computer and communications security. Certificateless cryptography, together with digital signatures, is the best solution for achieving fundamental security, i.e., confidentiality, data integrity, non-repudiation, and authentication. Correspondingly, certificateless cryptography (CLS) abolishes certificate management problems and the key escrow problems of public-key cryptography (PKC) and identity-based cryptography (IBC). CLS is the optimum combination of PKC and ID-based PKC, hence making it more efficient. Many signature schemes rely on certificateless schemes (CLS) and are formed using bilinear pairing and the MTP hash functions. An MTP (map-to-point) hash function and elliptic curve bilinear pairing are lavish procedure schemes, and they enhance computation expenses in the schemes and are timeconsuming. In contrast, pairing-free CLS schemes rely on elliptic curve cryptography (ECC) and have comparatively less computational cost, providing the desirable time requirement and making the scheme more efficient. In this chapter, we have done a survey of various pairingfree CLS schemes and compared them with each other. We have analyzed the performance evaluation of various schemes’ security and efficiency. Some are even observed to be precarious under various attacks. 

Keywords: Cryptography, Certificateless Cryptography, Security, Identity Based Cryptography, Public-key cryptography, Elliptic curve cryptography.