Mobile ad hoc network (MANET) is an autonomous system of mobile nodes. The nodes are free to move arbitrarily. Due to lack of a centralized secure infrastructure, the communication is prone to security attacks and the nodes can be easily compromised. Security has become one of the major issues for data communication over wired and wireless networks so various security-enhanced measures have been proposed to improve the security of data transmission over public networks. The objective of proposed work is to improve routing security we propose a proactive mechanism as Randomized routing that explores the existence of multiple routes and forces packets to take alternate paths randomly from its neighbors that is a Randomize delivery path for secure data transmission. We maintain neighboring nodes of each node by sending hello packets. Then we find out delivery path from neighboring nodes by random operation excluding previous hop which is maintained as history node. Protocol RDSDV is implemented to randomize delivery paths and compared the proactive routing protocols DSDV and RDSDV for different number of nodes. The performance of these protocols is measured under a Particular scenario on the basis of three metrics as Packet delivery ratio, e2e delay and jitter