7/31/2019 First 17

1/5

CRYPTOGRAPHIC ALGORITHMS

Presenter JEAN PAUL NIZEYIMANA No 17

The art of secret writing

The art of protection using information

The science of encrypting or hiding secrets

Needed for confidentiality

(http://en.wikipedia.org/wiki/Cryptography)

INTRODUCTION

What is a Cipher or Crypto-algorithm ?

A method or system for transforming given information inorder to conceal its meaning.

http://en.wikipedia.org/wiki/Cryptographyhttp://en.wikipedia.org/wiki/Cryptography

7/31/2019 First 17

2/5

Algorithms Genealogy

Algorithms

Ciphers Authenticators

AsymmetricSymmetric

DES\3DESAES

IDEARC6

BlowFish

RSAELGAMAL

SHAMD5

7/31/2019 First 17

3/5

A single key for encryption and decryption operations.

More the number of bits of key, more secure your data.

Algorithms are usually characterized as stream or block ciphers.

Used generally for protecting data.

Symmetric Ciphers

7/31/2019 First 17

4/5

One key for encryption and another key for decryption

operation.

More the distance between mutually prime nos. (here they are key),more secure your data.

Used generally for protecting data as well for making sure its authentication.

Asymmetric Ciphers

7/31/2019 First 17

5/5