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Cryptography & Network Security
- 1. Cryptography & Network Security By: Brijmohan Lal Sahu Department of Computer Science NIT Raipur
- 4. The Story Alice Bob Communicate Hi, I am Alice! Hi, I am Alice!
- 5. The Story Alice Bob Communicate Hi, I am Alice! Tom Hi, I am Alice! Stay away from Me!
- 6. The Story Alice Bob Communicate Tom Hi, I am Alice! Cryptography abd@ #%$! encrypted abd@ #%$! encrypted abd@ #%$! encrypted Hi, I am Alice! Decrypted
- 7. Cryptography An art for communicating over insecure channel securely. It’s a technique that provides security to message from un-intended people. Basic terms of Cryptography: ● Sender ● Message / Plain Text ● Channel / Medium ● Encryption ● Key ● Decryption ● Receiver
- 8. The Story Alice / Sender Bob / Receiver Communicate Hi, I am Alice! Cryptography abd@ #%$! encrypted abd@ #%$! encrypted Hi, I am Alice! Decrypted Hi, I am Alice! KEY Algorithm abd@ #%$! encrypted KEY Algorithm Hi, I am Alice! Decrypted abd@ #%$! encrypted Encryption Decryption
- 9. Cryptography The security depends on the secrecy of key. As algorithm is publicly available to everyone. Now on the basis of number of key there are two types of cryptography: 1. Symmetric Key Cryptography : Only single key is used. Algorithms used are : Ceaser Cipher, Playfair Cipher, Hill Cipher, Vigenere Cipher, DES algorithm, AES algorithm. 1. Asymmetric Key Cryptography : Two keys are used. Algorithm used: RSA, ECC
- 10. Cryptography The strength of cryptographic algorithm lise in computing power required to apply all possible keys to decrypt it. And with time as computing power is available slowly some algorithms are becoming vulnerable and so easy to break that they are no longer in use. Example : Ceaser Cipher, Playfair Cipher
- 11. Same Key : Symmetric Key Alice / Sender Bob / Receiver Communicate Hi, I am Alice! Cryptography abd@ #%$! encrypted abd@ #%$! encrypted Hi, I am Alice! Decrypted Hi, I am Alice! KEY Algorithm abd@ #%$! encrypted KEY Algorithm Hi, I am Alice! Decrypted abd@ #%$! encrypted Encryption Decryption
- 12. Alice / Sender Bob / Receiver Communicate Hi, I am Alice! Cryptography abd@ #%$! encrypted abd@ #%$! encrypted Hi, I am Alice! Decrypted Hi, I am Alice! KEY Algorithm abd@ #%$! encrypted KEY 2 Algorithm Hi, I am Alice! Decrypted abd@ #%$! encrypted Encryption Decryption Different Keys : Asymmetric Key
- 13. Network Security Network ( Computer Network ) is the group of all devices and softwares that provides the foundation for communication in digital world. Providing security to all those devices and softwares is known as network security. Cryptography and Cryptographic algorithms are backbone of Computer Security or Network Security.