Summary Day by Day data is increasingly, due to rapid development of data we need to specify some methods to protect our data from unauthorized users. For this we use encryption and decryption techniques and studying different methods. These Notes cover all basic

Information Security

Mamoona Jabbar

,Information Security

Topic: Cryptology

, Origins of Cryptography

Inherent needs as human being:
a. To communicate and share information and
b. To communicate selectively

These two needs gave rise to the art of coding the messages in such
a way that only the intended people could have access to the
information. Unauthorized people could not extract any information,
even if the scrambled messages fell in their hand.

The art and science of concealing the messages to introduce secrecy
in information security is recognized as cryptography.

, Origins of Cryptography




The word ‘cryptography’ was coined by combining two Greek
words, ‘Krypto’ meaning hidden and ‘graphene’ meaning
writing.