What would you choose: detailing things or summing up using codes? The sooner you start to code, the longer the program will take. Cryptography is a method of protecting information and communications through the use of codes, so that only those for whom the information is intended can read and process it. It is associated with the process of converting ordinary plain text into a text which is impossible to understand and vice-versa. It not only protects data from theft or alteration, but can also be used for user authentication. Data is encrypted using a secret key, and then both the encoded message and secret key are sent to the recipient for decryption. Decryption is a process that transforms encrypted information into its original format. It contains a range of situations where the use of this facility gives the provision of a secure service: cash withdrawal from an ATM, Pay TV, email and file storage using Pretty Good Privacy (PGP) freeware, secure web browsing, and use of a GSM mobile phone. This helps ensure the regular use of encryption functions and prevents data loss even if a mobile device, hard drive or storage medium falls into the wrong hands.

Suriya Stephen

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