Properties of Secure Communication

Intruders are the who can alter the receive the message, send the message and even alter the mess...}

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Principles of Cryptography: Symmetric Key and Public Key

• Cryptography secures the potential information 
• Both Symmetric and Asymm...}
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RSA Algorithm

• Encryption: Ciphertext (C)=p^e mod (n)
• Decryption: p=C^d&...}
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Digital Signatures

• the sender needs to have the digital signature
• only authorized signatures are acce...}
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Securing E-Mail (PGP)

PGP offers:

1. Authentication
2. Confidentiality
3. Compression
4. Em...}
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Securing TCP Connections (SSL)

• SSL creates encrypted link between the browser session and the web server 
• it...}
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Network Layer Security (IPsec, VPN)

Remote access VPNs

• Two connections- one is made to the internet and the second is ma...}
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Securing Wireless LANs (WEP)

Aim of WEP

• Access control
• Data Integrity
• Confidentiality
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Firewalls: Application Gateway and Packet Filtering, and DNS

limitations of firewalls and gateways:

1. IP spoofing: router can't k...}
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