what is Encryption?

Hello,
I am working for data center. I dont have any idea about encryption.I want to know about the Encryption. how is it work? An also want to know the difference between a cipher and a code? can anyone help me out? Any suggestion??

Code" and "figure" interchangeably, technically they are two entirely different things. When you replace each letter in a message to a different symbol is a number. A code of other means to assign a secret meaning of a word or phrase.Substitution numbers were good enough for almost two thousand years, but they ultimately failed due to improved technology. The Enigma cipher used by the German army during World War II is a substitution cipher and was broken long before the era of computers, both the Poles and the most famous alternative British.There is an alternative form of encryption that offer excellent security. By making random substitutions, patterns of numbers that make substitution of other vulnerable groups are eliminated. The simplest form of random substitution is to break a message into blocks of 4 bytes (4 ASCII characters) and add a pseudo-random number to each block. To recover the plaintext (message input), subtract the same number of pseudo-random numbers from the ciphertext (the encrypted message). The key is simply the initial value of the pseudo-random number generator.

Encryption is the conversion of data into a form, called a ciphertext, that can not be easily understood by unauthorized people.In simple ways encryption means translation of data into a secret code. Encryption is the most effective way to achieve data security. The use of encryption / decryption is as old as the art of communication. In wartime, a cipher, often incorrectly called the code can be used to prevent the enemy from obtaining the contents of transmissions. Simple ciphers include the substitution of letters for numbers, the rotation of letters of the alphabet, and "scrambling" of voice signals by inverting the sideband frequencies. More complex ciphers work according to sophisticated computer algorithms that rearrange the data bits in digital signals.

Encryption are the processes involved in the science of cryptography vice vers is same for decryption. Take a plain text message and encrypt it so it can be understood only by someone with the decryption key. This has been used for more than 2,000 years.Programmers will sometimes use encryption to encrypt data in applications and prevent anyone from reading or modifying data.Any this algorithm can be used that takes the original text and the process through key encryption as long as there is a corresponding decryption key. For the strongest encryption, one well-tested algorithms such as AES (Advanced Encryption Standard) should be used.