Abstract: Web security is important to keeping hackers and cyber-thieves from accessing sensitive information. Without a proactive security strategy, businesses risk the spread and escalation of malware, attacks on other websites, networks, and other IT infrastructures. Injection and authentication flaws, XSS, insecure direct object references, security misconfiguration, sensitive data exposure, a lack of function-level authorization, CSRF, insecure components, and unfiltered redirects. In this Application the users has to select either want to send something by encrypting or wants to receive by decrypting. If it want to send them it have to select source file previously designed or type some message which is to encrypt and transfer.[1] Whereas on the receiver side again the receiver has to select the file which is to be received from the sender along with decryption key to decrypt the message. Decryption key randomly generate and send to the Receiver inbox. Every receiver has a inbox login and it use graphical password. After logged in receiver can view the decrypted key for open the data.

Keywords: Secure Message Transmission; Base 64; Online web Application; Encryption.

| DOI: 10.17148/IARJSET.2021.8411