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Network security - Basic concepts

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This slide is included some concepts of networks security (old).


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Network security - Basic concepts

  1. 1. Network Security Present by Khoa.NK
  2. 2. Common technics Eavesdropping - Put devices and/or softwares in middle layer - Easier in wireless network - No-way to prevent in the public networks - Encrypt data
  3. 3. Common technics Cryptanalysis - Find information from encrypted data - Use math methodology and high performance machines - Encrypt data with un-structure algorithm - Use complex password for route-force attack
  4. 4. Common technics Password Pilfering - Guessing - Social engineering - Dictionary - Password sniffing
  5. 5. Common technics Guessing: 10 passwords most common in the world by PC Magazine) Password 123456 qwerty abc123 letmein monkey myspace1 password1 blink182 (the user's own first name)
  6. 6. Common technics Social engineering: use social skill to find information - impersonate - physing via email, website
  7. 7. Common technics Identity Spoofing
  8. 8. Common technics Buffer-overflow - strcat(), strcpy(), sprintf(), vsprintf(), bcopy(), get(), scanf(),..
  9. 9. Common technics DoS and DDoS - Type - Smurf - Buffer Overflow attack - Ping of dead - SYN attack Tools: Jolt2, Bubonic.c, Land and LaTierra, Targa, Blast20, Crazy Pinger, Some Trouble,...
  10. 10. Common technics Malicious Softwares - Virus - Worms - Trojan - Logic bomb - Backdoor - Spyware - Keylogger
  11. 11. Encryption - plaintext - cyphertext - key c = E(m, k) m = D(c, k)

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