Abstract
If we look at the world today then we will see that Internet has reached to each and every aspect of our day-to-day life. It is used for vital purposes and one of them is for communication, whether it is normal, business or confidential interactions. With enhancement of communication technology a need for secure communication also arises which is fulfilled by different encryption techniques like cryptography, digital signatures, watermarking, steganography etc. Cryptography is an encryption technique used for network security when different networks are interconnected and become venerable to attacks and intrusions. In this paper we will review cryptography with its goals, types and algorithms used for it. Also types of attack used for intrusion and cyber security technology.
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