Cryptology Ppt

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what is cryptography

Transcript of Cryptology Ppt

PAPER PRESENTATIONON

CRYPTOLOGYBY:K.Srinivas

CRYPTOLOGYCryptology

Also called as cryptographyFrom Greek , kryptos, "hidden, secret" Is the practice and study of hiding information

TERMINOLOGY

Encryption Decryption

Cipher andKeys

HISTORY OF CRYPTOGRAPHY

The Ancient Greek scytale, probably much like this modern reconstruction, may have been one of the earliest devices used to implement a cipher

TYPES OF CIPHER

Classical ciphers Substitution ciphers

Polyalphabetic ciphers

EXAMPLES FOR CIPHERS

In Classical cipher type -

help me becomes ehpl em

In Substitution cipher type -fly at once

becomes gmz bu podf

POLYALPHABETIC CIPHERS

The Polyalphabetic ciphers were developedby Leon Battista Alberti around the year 1467.

CREDIT CARD WITH SMART CARD

MODERN CRYPTOGRAPHY

Symmetric-Key cryptography Public-Key cryptography

CryptanalysisCryptographic primitives

SYMMETRIC-KEY CRYPTOGRAPHY

Block cipher Example: AES and DES

Stream cipherExample: RC4

PUBLIC-KEY CRYPTOGRAPHY

PUBLIC-KEY CRYPTOGRAPHY

Public-Key is also called as Asymmetrickey

The Public-Key is used for encryption and the Private-Key is used for decryption

DIGITAL SIGNATUREA digital signature is an reminiscent of an ordinary signature. It uses two algorithms 1. Signing 2. Verification

PADLOCK ICON

CRYPTANALYSISThe goal of cryptanalysis is to find some weakness or insecurity in a cryptographic scheme, thus permitting its subversion or evasion

CRYPTANALYTICAL ATTACKS

Cipher text-only attack Known-plaintext attack Chosen-plain text

CRYPTOSYSTEMSCryptographic primitives provide fundamental properties, which are used to develop more complex tools called cryptosystems or cryptographic protocols

APPLICATIONS

Security of ATM cards Computer passwords Electronic commerce

QUESTIONS

THANK YOU