What is cryptography


Cryptography derived its name from a Greek word called “Kryptos” which means “Hidden Secrets”. Cryptography is the practice and study of hiding information. It is the Art or Science of converting a plain intelligible data into an unintelligible data and again retransforming that message into its original form. It provides Confidentiality, Integrity, Accuracy.




The process of converting plain text into an unintelligible format (cipher text) is called Encryption.




The process of converting cipher text into a plain text is called Decryption.



What is a Key

 In cryptography, a key is a variable value that is applied using an algorithm to a string or block of unencrypted text to produce encrypted text, or to decrypt encrypted text. The length of the key is a factor in considering how difficult it will be to decrypt the text in a given message.


What is a Block Cipher?

 A method of encrypting / decrypting data

 Key is used for encryption / decryption.

  Same size of I/P and O/P

 What is Initialization Vector?

 An initialization vector (IV) is an arbitrary number that can be used along with a secret key for data encryption.

 It is a group of hex values.