Threshold based (t, n) Secrecy using Open Channel and Prevent Man-in-the-Middle Attack and Share Forgery
Anindya Kumar Biswas, Mou Dasgupta · 2024
The seamless connectivity offered by open channel have made our life easier. Large number of message exchange takes place on a daily basis. This have culminated in widespread increase of attacks. Henceforth, it has become prerequisite to repeatedly protect any confidential information. A reliable way for the same is threshold-based security association, where security depends on a group rather than any individual. Our work provided in this paper conveys two ways of security association. Firstly, when all the interested participants want to have a common secret key. Secondly, groups of a predetermined size are formed when each group needs to have unique keys. We make use of modified Shamir's scheme and extend Diffie-Hellman scheme. We correct the problems of cheating by valid participants and the credibility of mutually trusted dealer in original Shamir's scheme. The serious issue of man-in-the-middle attack is also addressed in our scheme. Both the proposed schemes follow information theoretic security and the keys secretly negotiated can be used for encryption/decryption purposes. The methods themselves can be used for exchanging personal data or covert information. Once security association is complete, it is possible to reliably communicate sensitive information amongst adversaries.