Cyber security

Cyber security

1. Cyberattacks

   • Malware
     • Keyloggers
       • Records every keypress and sends to hacker.
     • Botnets
       • Network of infected computers.
     • Ransomware
       • Hacking and demanding money to give back information.
   • Phishing
     • Fake emails, messages to get logins and details.

2. Cyber defences

   • Ethical hacking
     • Grey-hat hacking
       • Hacking with no permission but doing good.
     • White-hat hacking
       • Hacking with permission.
   • Security software
     • Antivirus and scans computer, must be updated.
   • Backups
     • Have copies of information if deleted or damaged.

3. Encryption

   • Cracking
     • Brute force
       • Use every possible key until successful.
     • Statistical attack
       • Using estimates and statistics to crack cipher.
   • Plaintext
     • Unencrypted data.
   • Key
     • Information to encrypt/decrypt data.
   • Ciphertext
     • Encrypted data.
   • Ciphers
     • Substitution cipher
       • Each letter replaced by another.
     • Caesar cipher
       • Alphabet shifted a number of spaces.

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