The popularity of the Internet has comprehensively altered the traditional way of communication and interaction patterns, such as e-contract negotiations, e-payment services, or digital credential processes. In the field of e-form systems, a number of studies investigate the ability of the blind signature to fulfill the basic properties of blindness and untraceability. However, most literatures exploring the blind signature mechanisms only address research and technology pertaining to single blind signature issues. Further, most of the topics only deal with signing rather than encryption. Thus, we propose a new blind signature scheme for multiple digital documents based on elliptic curve cryptography (ECC). Our scheme incorporates the design of signcryption paradigm into the blind signature scheme to strengthen high levels of security. This innovative method also enhances computational efficiency during processing multiple electronic documents since the ECC provides a shorter key length and higher processing speed than other public-key cryptosystems on equivalent secrecy. The analysis results show that the present scheme achieves better performance at low communication overheads as well as with higher level of security. By helping the design of the intrinsic properties, the proposed cryptosystem can be applied to many areas to protect sensitive data in ubiquitous computing environments.

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.

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