Cryptography Securing Information

Created By : Rahul Khanvani
Roll No : 47
Department Of Computer Science
Cryptography:
Securing the Information.
Rahul Khanvani For More Visit
BinaryBuzz.Wordpress.com

Introduction

Introduction
» EPFT UIJT MPPL MJLF OPOTFOTF UP ZPV ?
 Does it look like nonsense to you ?
 Did you notice that I asked you the same question twice ?
 Confused ?
» Replace Each word With its Alphabet used before.
» The Cryptography is Simple 

» Cryptography is the art and science of converting ordinary information
into gibberish and converting it back to its original, meaningful form.
» Its Amazing how rotating the alphabets by even just one position is
enough to confuse human mind !
» We Call It Rotating Words.
» To convert data in meaningful form you need an algorithm ,
» you can also create your own small algorithm.
What Is Cryptography ?

» If You Say No Then I Can Say You May B Don’t Use Cryptography.
 Do You Use Gmail ?
 Do You use Facebook ?
 Have you Ever Opened a File Containing Password ?
 Did U Use HTTPS Site ?
 Do You Fill Forms on Internet ?
» Most Of You Are Saving Your GF/BF’s No. As Their Nick Names Is Also A
Kind Of Cryptogrpahy.
 E.g Saving Ur G.F’s No As “Battery Low” To Hide The Contact From Relatives.
Who Uses Cryptography ?

» Plaintext – A message in its natural format readable by an attacker
» Cipher text – Message altered to be unreadable by anyone except the
intended recipients
» Key – Sequence that controls the operation and behavior of the
cryptographic algorithm
» Key-space – Total number of possible values of keys in a crypto
algorithm
» Encryption
 Plain text  Cipher text
» Decryption
 Cipher text  Plain text
Terms Used In Cryptography

» Defending against external/internal hackers
» Securing E-commerce
» Securing bank accounts/electronic transfers
» Securing intellectual property
Information Security for…

» Pervasiveness of email/networks
» Online storage of sensitive information
» Insecure technologies (e.g. wireless)
» Trend towards paperless society
» Weak legal protection of email privacy.
Threats to Information Security

How To Send A Secure Email Or Password Protected Email?

Types Of Cryptography

Secret Writing
Steganography
Cryptography
Types of Secret Writing

» Steganography – covered writing
 – is an art of hiding information
» Popular contemporary steganography
technologies hide information in images.
Steganography

» Encryption means the transformation of data by the use of
Cryptography to produce unintelligible data to ensure confidentiality
» The inverse function of encryption is called as decryption
Encryption and decryption:-

» Private (symmetric, secret) key – the same key used for
encryption/decryption
» Problem of key distribution
» How Do Both Person Agree On Same Key ?
Private Key Cryptography

» Public (asymmetric) key cryptography – a public key used for encryption
and private key for decryption
» Key distribution problem solved
Public Key Cryptography

 DES (Data Encryption Standard) and derivatives: double DES and triple DES
 IDEA (International Data Encryption Standard)
 Blowfish
 RC5 (Rivets Cipher #5)
 AES (Advance Encryption Standard)
Currently Available Crypto Algorithms (private key)

 RSA (Rivest, Shamir, Adleman)
 DH (Diffie-Hellman Key Agreement Algorithm)
 ECDH (Elliptic Curve Diffie-Hellman Key Agreement Algorithm)
 RPK (Raike Public Key)
Currently Available Crypto Algorithms (public key)

» Algorithms are not theoretically unbreakable: successful attacks in the
future are possible.
» Encryption does not guarantee security!
» Many ways to beat a crypto system NOT dependent on cryptanalysis,
such as:
 Viruses, worms, hackers, etc.
 TEMPEST attacks,
 Unauthorized physical access to secret keys
» Cryptography is only one element of comprehensive computer security
How Secure are Today’s Technologies?

Thank You…
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Cryptography Securing Information

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