Network security and cryptography

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By
Raj Kumar Rampelli

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Need for Network security
Classification of Network Attacks
◦

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Possible Attacks

Security Features
Security Me...

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What is a Network ?
◦ Data Carrier

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Data ?

◦ Anything which conveys something between
1st person (sender/receiver) ...

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What is Network Attack ?

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Categories of Attacks

◦ An action that compromises the security of DATA
◦ Passive

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...

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Normal Flow
Sender

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Receiver

Interruption
Sender

Disturb

Receiver

◦ Attack on “availability”

 Disconnection of...

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Interception (No Privacy)
Intruder
Sender

Receiver

◦ Attack on “confidentiality”
◦ Packet Analyzer software

 Interc...

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Modification
◦ Attacker modifies the data sent by the sender
◦ Gain access to a system and make changes
 Alter program...

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A Transaction/Communication (or a service)
is secure if and only if the following security
features are provided
◦
◦
◦
...

String of information that binds the unique identifier
of each user to his/her corresponding public key.

Services

•Provi...

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Symmetric Key scenario

Sender
(plain text) 
SK(plain text)

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Cipher Text
(Encrypted
text)

Receiver
SK(Cipher text)...

• Generation of Public-Private key pair

Performance
factors at
client

• Generation of certificate request
message
• Rece...

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Generate public and private key pair at client
Check the following details using different
Public Key Cryptography (...

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Generate certificate request message (CRM) using
public-private key pair
Apply for new Digital Certificate

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CA verif...

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String of information that binds the unique identifier of each client
to his/her corresponding public key.
P...

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Client encrypts the message using server’s public
key
The time taken for encryption of fixed size
message
◦ Using ser...

Performance factor-4:
Digital signature generation & verification

A valid digital signature gives a recipient reason to b...

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A method to Secure “Data transactions” between
users is needed
◦ Should ensure all desired security features for any
tr...

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Have a Look at:
My PPTs:

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http://www.slideshare.net/rampalliraj/

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My Tech Blog:

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http://practicepeople.blogs...

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