Deltacrypt OneClick Public Key File and Email Encryption Software application featuring RSA protection in its public keys, encryption and public key integrity protection with hashing functions and digital signatures. Deltacrypt OneClick lets the user create and distribute public keys. Its unalterable Deltacrypt public key files prevent man-in-the-middle attacks where key interception and substitution is at the heart of such attack. The Deltacrypt application is brute-force attack resistant by simulating decryption process in real decryption time when used with a false private key. All Deltacrypt Encryption applications provide OneClick set of commands for encryption and decryption is just a click. A OneClick creation feature walks the user each step of the way into command creation. No special skills required. It encrypts binary units of information therefore it can cipher any file formats with its 768-character key and has no encryption volume limitation. The Delete Option offered by the OneClick Encryption Software fills original source files with random characters before wiping them out. Source files become illegible if recuperated. At decryption, Deltacrypt reconstructs files identical to the original ones: same name, same time and same size. This flexible encryption program is constructed modularly facilitating its integration and use within existing environment. Multiple plug-ins may easily be added on to meet any special requirements. The Deltacrypt File and Email Encryption Software comes in a self-executable file and is menu-driven. It is packaged in Dynamic Linked Library(dll) and only requires about 800 kb. of memory space.