An Approach to Improve the Security of Online System using Crypto System

Presently, the chief problem facing Internet banking is the security of online transactions. That’s why, 3-tier security is used to make the transaction more secure. Among the 3-Tier Security layers, Application layer security comes first as it is the topmost layer in OSI model. The visitors always assume about the security and safety of these transactions, and so they are steadily lose their trust on the bank due to increase of various online Internet attacks. Now, it is trying to design an approach to enhance the Application Layer Security in case of online security application. It helps to make a latest idea about online banking transactions as well as increases trust and security over the existing theory, by challenge-response mutual authentication process. This paper says about possible preventions of Password Guessing by padding a random string in the different position of the password depending upon UTC (Coordinated Universal Time) time and Nearest Prime Number Concept. We also propose an algorithm on Multiple Key Block Cipher Symmetric Encryption (MKBCSE) algorithm which is advantageous in many respect than other existing symmetric key encryption technique. Different Key generation and NOB variable have major important role here, because the key here changes after a certain number of bits (NOB). Key comprises of various components and is a combination of various server and client related information. This makes it hard for the attacker to guess the key. Keyword:-Random string Padding, Multiple key symmetric encryption with block cipher, NOB.