encryption

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ENCRYPTION

PRESENTED BY

PLT. OFF. FIZA NADEEM

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SEQUENCE

¨ INTRODUCTION

¨ HISTORY

¨ ENCRYPTION

¨ TYPES OF ENCRYPTION

¨ METHODS OF ENCRYPTION

¨ USES

¨ CONCLUSION

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INTRODUCTION

¨ CRYPTOGRAPHY:

Science of encryption and decryption; converting between plaintext and ciphertext

¨ ENCRYPTION:

Conversion of data into a form, called a ciphertext

¨ DECRYPTION

To make encrypted information readable again

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HISTORY

¨ Ancient Babylonian merchants used intaglio

¨ A piece of flat stone carved into images and writings

¨ Using this, they are producing what we today call ‘Digital Signature’

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ENCRYPTION

¨ Process of transforming information

¨ Using cipher (algorithm)

¨ Unreadable to everyone except the one having key

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TYPES OF ENCRYPTION

1. MANUAL ENCRYPTION:¨ Use of encryption software

¨ User’s participation

¨ Great for PCs

2. TRANSPARENT ENCRYPTION:¨ Most secure type of encryption

¨ Encrypts everything on computer

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TYPES OF ENCRYPTION…(cont’d)

3. SYMMETRIC ENCRYPTION:¨ Most simplest type

¨ Code up yourself

¨ Only one key needed

¨ Safe method needed for transmission of key

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TYPES OF ENCRYPTION…(cont’d)

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TYPES OF ENCRYPTION…(cont’d)

4. ASYMMETRIC ENCRYPTION:

¨ Done electronically

¨ Public key is posted for the public to encrypt

¨ Decrpytion done only by private key

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TYPES OF ENCRYPTION…(cont’d)

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METHODS OF ENCRYPTION

¨ Consists of two main categories

¨ Stream Encryption: Clear text encrypted character by character

¨ Block Cipher Encryption: Clear text encrypted block by block

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USES OF ENCRYPTION

¨ Protect information on your computer.

¨ Protect information in transit

¨ Wireless phones

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USES OF ENCRYPTION … (cont’d)

¨ Confidentiality of medical, personal and transaction records

¨ Email program

¨ Digital signature

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CONCLUSION

¨ Contrary to what most people think, encryption is not a new thing

¨ Encryption is being commonly used to facilitate secret communication

¨ Encryption is used to protect data at rest and at transit

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THANK YOU!

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Q & A