Certificateless Public Key cryptosystems For Mobile Ad hoc Networks

Due to importance of security in many critical applications in Mobile Adhoc Networks (MANETs) and the limitation of the resources in mobile devices, it is important to have secure lightweight cryptosystem. The easier key management and less overhead of transmitting processes make Public Key Cryptosystems (PKC) suitable for MANETs. Obviously, the main issue regarding to the use of PKC is to ensure about the authenticity of users’ public key. However, complex management of Public Key Infrastructure in Traditional PKC and Key Escrow problem of Identity Based ones led to emphasize on the use of Certificateless PKC. In this research, beside of a Certificateless Public Key management scheme, a public key authentication schemes named IDRSA and two improved version of that named ClessRSA and EIDRSA have been investigated. In order to compare mentioned works, a standard format is given to investigate mentioned schemes based on the same notations and assumptions. Beside of mathematical comparison, the growth rate of computational expense for the particular part of mentioned schemes as a function of the number of requests is visualized. The results indicate that EIDRSA schemes has lower computational expense in compare with other existing ones because of eliminating Bilinear Pairing operation.