17-08-2012, 12:00 PM
NETWORK SECURITY and CRYPTOGRAPHY
NETWORK SECURITY and CRYPTOGRAPHY.ppt (Size: 442.5 KB / Downloads: 24)
What is a NETWORK ?
collection of systems connected together.
Why do Network Security?
As computer systems became more complicated
there was an increasing need for security
Network security is becoming more and more crucial as the volume of data
being exchanged on the internet increases
Cryptography
Cryptography, is the one of the methods to provide security.
It involves the use of a cryptographic algorithm used in the encryption and decryption process.
It works in combination with the key to encrypt the plain text, and also to decrypt the cipher text
Encryption and decryption
Encryption means the transformation of data by the use of Cryptography to produce unintelligible data to ensure confidentiality
The inverse function of encryption is called as decryption
Cryptographic Algorithms
Cryptographic algorithms can implemented either hardware (for speed), or in software (for flexibility). There are 3 classes of algorithms they are:
1. Conventional Cryptography (Symmetric algorithms, Private keys)
2. Public key Cryptography (Asymmetric algorithms, public keys)
3. Hash function algorithm.
Disadvantages:-
Severally limited by technology
Practical systems are limited by distance.
Photon emitters and detectors are far from perfect, causing a lot of errors.
Most protocols require a classical channel.
Conclusion
As the proverb says that “ Even a crow can peck an elephant which is stuck in the mud”. Even though we are providing high security by cryptography there are many pitfalls in it also. Nothing in the world is 100% secured.
Cryptography is one of the way to provide network security but it is not only the path to achieve network security.