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Network Security

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Material of a talk I gave in Raahe, Finland, September 2006

Tecnologia
1 de 68
Computer Security 101 ,[object Object],[object Object],[object Object],[object Object]
Outline ,[object Object],[object Object],[object Object]
Risks ,[object Object],[object Object],[object Object],[object Object]
Computer Security ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Non-networked System ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
The user/pass dilemma ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
What is a strong password? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Networked Systems ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Network technologies ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Meet Alice and Bob ,[object Object],[object Object],[object Object],[object Object],[object Object],ALICE BOB EVE TRUDY
User Authentication ,[object Object],[object Object],[object Object],[object Object],[object Object],Who?
Authentication case ,[object Object],ALICE EVE TRUDY BOB
Different approaches ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Doing it right ,[object Object],[object Object],[object Object],[object Object],[object Object]
Confidentiality ,[object Object],[object Object],[object Object],[object Object],[object Object]
Message Integrity ,[object Object],[object Object],ALICE TRUDY BOB
Integrity ,[object Object],[object Object],[object Object],[object Object]
Ensuring Message Integrity ,[object Object],[object Object],[object Object],[object Object],ALICE BOB message + MIC verify MIC MIC is a 1-way function
Message Encryption ,[object Object],[object Object],[object Object]
Encryption algorithms ,[object Object],[object Object],[object Object],[object Object],Caesar DES AES RC4 Enigma Navajo RSA
Secret Key Ciphers ,[object Object],ALICE BOB EVE ???
Basic Ciphers ,[object Object],1 1 1 1 0 0 0 0 0 1 1 0 0 0 1 0 substitution look-up table SUBSTITUTION 1 1 1 1 0 0 0 0 0 1 0 0 1 1 0 1 TRANSPOSITION
Substitution ciphers ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Caesar's still being used ... ... wrote notes using an encryption scheme similar to the one used by Julius Caesar more than 2,000 years ago ...
Some common ciphers ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],ciphertext = f ( data , key )
Algorithms secrecy ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Distribution of the keys ,[object Object],[object Object],[object Object],ALICE BOB EVE
Public Key Cryptography ,[object Object],[object Object],[object Object],[object Object],[object Object],private key (secret)
Public Key algorithms ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
RSA algorithm ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
RSA details ,[object Object],[object Object],[object Object],private key (secret) ALICE BOB
Digital signature ,[object Object],[object Object],[object Object],[object Object],[object Object],public key ALICE BOB Warning: Anyone can decipher this special ciphertext.
Message digest ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],SHA1("The quick brown fox jumps over the lazy dog") = 2fd4e1c67a2d28fced849ee1bb76e7391b93eb12
Public Key Distribution problem ,[object Object],[object Object],BOB EVE public key Bob, This is Alice. Let me send you my public key
Identity certificates ,[object Object],[object Object],[object Object],[object Object],ALICE + fa54a1234
Certificates in your browser
Crypto wars ,[object Object],[object Object],[object Object],[object Object],[object Object]
What layer Security is on? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Wi-Fi security ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Brief history of Wi-Fi security ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
What is WEP? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
RC4 algorithm ,[object Object],i := 0 j := 0 while GeneratingOutput: i := (i + 1) mod 256 j := (j + S[i]) mod 256 swap(S[i],S[j]) output S[(S[i] + S[j]) mod 256]
RC4 in WEP ,[object Object],IV RC4 WEP key IV ciphered packet original packet checksum
Risks in WEP ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
WEP authentication ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
More authentication problems ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
WEP encryption blues ,[object Object],[object Object],[object Object],[object Object],[object Object]
Countermeasures? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
How bad is it? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Life after WEP ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
802.1x corporate network + Internet Authentication network 802.1x ,[object Object]
Virtual Private Networks ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Network VPN server
WPA-PSK users beware! ,[object Object],[object Object],[object Object],[object Object]
Meet the bad guys ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Attacker's tools ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
What is a sniffer? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Sample Ethereal screenshot
What is ARP poisoning? ,[object Object],[object Object],[object Object],[object Object],[object Object]
What is a network scanner? ,[object Object],[object Object],[object Object],[object Object]
What is a Wi-Fi scanner? ,[object Object],[object Object],[object Object],[object Object]
What is a WEP cracker? ,[object Object],[object Object],[object Object],[object Object],[object Object]
What is a security scanner? ,[object Object],[object Object],[object Object]
What is a security mail list? ,[object Object],[object Object]
What is social engineering? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
What can we do then? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Anything else? ,[object Object],[object Object],[object Object],[object Object],[object Object]
Isn't my FW/AV/... the fix? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Thank you ,[object Object],[object Object],[object Object]

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Network Security

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  • 24. Caesar's still being used ... ... wrote notes using an encryption scheme similar to the one used by Julius Caesar more than 2,000 years ago ...
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