A mobile ad hoc network is a special type of wireless network in which a collection of mobile hosts with wirelessnetwork interfaces may form a temporary network. Without the aid of proper fixed infrastructure, providing securecommunications is a big challenge. The strength of the security solutions very much depends on the cryptographickeys used for communication. Efficient key management is an important requirement of such networks. For networkslike MANET which are basically constrained networks with minimum resources, identification of suitable asymmetriccryptosystem is a vital one. Hence an attempt has been made in this paper to identity a suitable asymmetric-thresholdbased cryptosystems for small MANETs. The study focuses on the comparison of Rivest Shamir Adelman-ThresholdCryptography and Elliptic Curve Cryptography Threshold Cryptography in terms of the performance parameterslike key generation time, Encryption time, Decryption time and communication cost. Different small networkscenarios with variable node sizes and key sizes are experimented and the results show that ECC-TC is the mostdesirable asymmetric-threshold cryptosystem for small MANET.
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