Cryptography is a technique of transforming and
transmitting confidential data in an encoded way so that
only authorized and intended users can obtain or work on it.
It is a Greek origin word in which “crypto” means hidden
and “graphy” means writing , so cryptography means
hidden or secret writing. It introduces triads like
confidentiality, non-repudiation, integrity and authenticity
within ongoing data communication.
Cryptanalysis is process of defeating the work of
cryptography. This word is also originated from Greece
where kryptós stands for "hidden" and analýein means "to
loosen" or "to untie" . It is used to intrude or breach the
cryptographic system with or without knowing the secret
key of the process.
Cryptology is the study of cryptography and cryptanalysis
together. Cryptography is sometimes also referred as
Cipher-system. A basic illustration of cryptosystem is given
in below figure (Fig1) where sender transforms plain text
into cipher text using some encryption algorithm and secret
key, then transmits it over the channel. At receiver’s side
plain text is extracted from cipher text using decryption
algorithm and decryption key
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