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Cryptography

Cryptography. CSc 8320 Advanced Operating Systems Barnali Chakrabarty. Overview. What is Cryptography ? Its history And its fundamentals Public and Private Cryptographic Systems Current Work Future Research. What is Cryptography ?.

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Cryptography

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  1. Cryptography CSc 8320 Advanced Operating Systems BarnaliChakrabarty

  2. Overview • What is Cryptography ? Its history And its fundamentals • Public and Private Cryptographic Systems • Current Work • Future Research

  3. What is Cryptography ? The process of converting intelligible information called the plain text into something that is unintelligible, called the cipher text

  4. History of Cryptography • 2000 BC in Egypt • Atbash Cipher • Caesar Cipher

  5. Fundamentals of Cryptography Confidentiality Authenticity Integrity Availability Nonrepudiation

  6. Public Key Cryptographic Systems • asymmetric key algorithms the key used to encrypt a message is not the same as the key used to decrypt it

  7. Diffie Hellman Algorithm: A public key Cryptographic Algorithm

  8. Private Key Cryptographic Systems - Also called Symmetric encryption involves using the same key for encryption and decryption.

  9. One Time Pad: A Private Key Cryptographic Algorithms The plain text is combined with a secret random key only once to produce the cipher text

  10. Current Work :Research on Elliptic Curve Cryptography[Q.Qiu04] Offer major advantages over Traditional systems like 1.lesser storage 3.smaller keysize 4.increased speed

  11. Future Work: Research on Quantum Cryptography[5] • based on photon physics. A photon vibrates as it travels through space. The angle of vibration is known as polarization of the photon. Using different polarizations, the sender can transmit a unique symmetric key to receiver each time she needs to send a message. Theoretically,the eavesdropper has no chance to intercept this key because of unique properties of quantum physics

  12. References [1]http://all.net/BOOKS/IP/cHAP2-1.HTML [2]http://gdp.globus.org/gt4-tutorial/multiplehtml/ch09s03.html [3]http://en.kioskea.net/contents/crypto/cleprivee.php3 [4]  Research on elliptic curve cryptography, QizhiQiu , Qianxing Xiong,2004 [5]http://www.uhisrc.com/FTB/Cryptography/FTBCryptography.pdf [6]Distributed Operating Systems and Algorithm Analysis, Andy Chow & Theodore Johnson,1997 [7]Wikipedia

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