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Cryptography is the practice and study of techniques for secure communication. In ancient daysCryptography's potential for use as a tool for espionage and sedition has led many governmentsto classify it as a weapon and to limit or even prohibit its use and export. In some jurisdictionswhere the use of cryptography is legal, laws permit investigators to compel the disclosure ofencryption keys for documents relevant to an investigation. In ancient time this cryptographywas used in a cipher form. After days grow there was a new technic called the Enigma machine,invented in 1919 by Hugo Koch, a Dutchman, looked like a typewriter and was originallyemployed for business purposes. The Germany army adapted the machine for wartime use andconsidered its encoding system unbreakable.Data confidentiality may be provided by one of two categories of encryption algorithm, namelysymmetric cryptography and asymmetric cryptography. Symmetric, or conventional,cryptography requires that the sender and receiver share a key, which is an item of secretinformation used to encrypt and decrypt data. In cryptology, a code is a method used to encrypt amessage that operates at the level of meaning; that is, words or phrases are converted intosomething else. … By contrast, ciphers encrypt messages at the level of individual letters, orsmall groups of letters, or even, in modern ciphers, individual bits.Modern cryptography is heavily based on mathematical theory and computer science practice.The growth of cryptographic technology has raised a number of legal issues in the informationage. Cryptography uses sophisticated mathematical equations (algorithms) and secret keys toencrypt and decrypt data. Today, cryptography is used to provide secrecy and integrity to ourdata, and both authentication and anonymity to our communications.Coming to the corporate they use this cryptography technic a lot to store their data. They store allthe customer information in the encrypted format only so that it is not leaked any were in thepublic to get rid from hacking. Most of them use the RSA technic in their companies for thenetwork security purpose.Since, generations to generations human are using cryptography techniques in any other waypossible. In our daily routine from checking and sending emails, sending normal text and over towhats app (In fact, now whats-app got the chat ENCRYPTED), disk encryption, communicationsover secure network and most common and important is electronic money (Have to mentiondigital cryptocurrency). We all are now exited for Bitcoins, Litecoins, Ethereum etc, etc. But thisis the place where cryptography plays its role in dashing way. For sure, we need this unique technique, in as secure way as possible to make our daily techy lifemore secure.

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