Hello Steemit !

It's been a long day since I hadn't made a blog post on steemit.Recently,I have been very busy in my study and other stuffs.But hopefully today is my holiday and I have finally got a spare time to make my post.
In this blog post,I am going to describe about Security Mechanisms and Cryptography.

Security Mechanisms

To secure every system from attacks a set of security mechanism are implemented.Security Mechanism is a process that is designed to detect,prevent or recover from a security attack.The mechanisms may include cryptography for ensuring confidentiality and integrity,authentication systems and digital signature schemes for ensuring integrity and so on.

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Cryptography

The word Cryptography comes from two Greek words 'kryptos' meaning "hidden or secret" ; and 'graphein' meaning writing thus cryptography means "secret writing".It is an art and science of information hiding.This field is very much associated with mathematics and computer science with application in many fields like computer security,electronic commerce,telecommunication,etc.In cryptography,it consists of encryption and decryption process.The Encryption is the process of encoding a message so that its meaning is not obvious i.e. converting information from one form to some other unreadable form using some algorithm called cipher with the help of some secret message called key.The converting text is called plaintext and the converted text is called ciphertext.The Decryption is the reverse process,transforming an encrypted message back into its normal,original form.In decryption process also the use of key is important.

The use of encryption-decryption techniques is being used since very long period as it can be noted from the technique called Caeser's cipher used by Julius Caeser for information passing to his soldiers.Encryption techniques have also been extensively used in the mlitary purpose to conceal the information from the enemy.
I will be discussing about CIPHERS in the next part.
THANK YOU!!