Biblio

Despite the wide of range of research and technologies that deal with the problem of routing in computer networks, there remains a gap between the level of network hardware administration and the level of business requirements and constraints. Not much has been accomplished in literature in order to have a direct enforcement of such requirements on the network. This paper presents a new solution in specifying and directly enforcing security policies to control the routing configuration in a software-defined network by using Row-Level Security checks which enable fine-grained security policies on individual rows in database tables. We show, as a first step, how a specific class of such policies, namely multilevel security policies, can be enforced on a database-defined network, which presents an abstraction of a network's configuration as a set of database tables. We show that such policies can be used to control the flow of data in the network either in an upward or downward manner.

Now a days transferring of texts, documents over the internet are the tasks in common. The transferred text must be cryptographically protected so that cannot be accessed by the invaders. In the communication medium, protected data uses cryptographic techniques and random bit generators. Once the key is generated by the random generators, how well we can secure and transmit fast in the network plays a vital role by applying appropriate algorithm. As a solution, a system is developed by symmetric algorithmic approach, uses AES and Fiestel content and also implements three different ways of random generators such as pseudorandom number generator (PRNG), linear multiples of prime sequence based method and nonlinear prime methods. Multilevel encryption and decryption techniques are adopted in the solution to transfer the information over the network securely with reduced delay. This method provides very strong technique against different kinds of attacks.