crytography_new1

7/31/2019 crytography_New1

1/20

S.R.E.S.College Of Engineering,

Kopargaon


2/20

INTODUCTION

HISTORY

OBEJECTIVE & OVERVIEW

APPLICATIONS

CRYPTOGRAPHY COMPONENTS

TYPES OF CRYPTOGRAPHY

ADVANTAGESCONCLUSION

REFERENCES

Content


3/20

Cryptography is the science ofinformation security.

The word is derived from theGreek kryptos, meaning hidden.

Cryptography includes techniquessuch as microdots, merging words

with images, and other ways tohide information in storage ortransit.

Introduction


4/20

History Of Cryptography


5/20

Confidentiality

Integrity

Authentication

Objectives


6/20

Overview of Cryptography & ItsApplications

privacy and security in communicating.

In the past, cryptography is heavily used for

militaryapplications to keep sensitive informationsecret from enemies

Cryptography provides most of the methods

and techniques for a secure communication


7/20

6

CryptographyComponents


8/20

Encryption It is a process of changing orconverting normal text or data information intogibberish text.

Decryption It is a process of changing or

converting gibberish text back to correctmessage or data by using encryption method.

Cryptography Components


9/20

10

Categories ofCryptography


10/20

11

A single common encryption key is used to

encode and decode messages. Both sender and receiver must know the

common key.

Symmetric encryption is simple and fast. But - key management is impractical with

large number of senders and receivers.

Symmetric Key Cryptography


11/20

11

Symmetric Key Cryptography


12/20

12

Asymmetric system under, which twodifferent keys are used to encryptand decrypt the message or received

data packet.

On public key is used to encrypt thedata or message and the private key

on receiving end is used to decryptthe message or data packet.

Asymmetric-key Cryptography


13/20

Asymmetric-key Cryptography


14/20

Keys used in Cryptography


15/20

Sender "sign messages by means of

his private secret key. Recipient verify the senders signature

by means of the senders public key. The senders identity is certified by

means of a "Certificate which is

digitally signed by a trusted third party.

Digital Signature &

Certificate


16/20

Public-key cryptography Increased securityand convenience.

Public-key cryptography is best suited for anopen multi-user environment.

Symmetric encryption is simple and fast.

Advantages


17/20

cryptography = physics + Information theory

Information is physical.

Information gain implies disturbances.

Conclusion


18/20

www.bankinfo.com/ecomm/setpart1.html

www.sans.org/infosecFAQ/covertchannels/SET.html

www.cs.jcu.edu.au/~pei/cryptography.html

www.Google.com

References


19/20

Guided By:-

Prof. Hitesh MohapatraPresented By:-

Durgesh R. Patkari


20/20

crytography_new1

Documents