Wireless Encryption Flashcards Preview

CompTIA N10-007 Network+ > Wireless Encryption > Flashcards

Flashcards in Wireless Encryption Deck (4)
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1
Q

Wireless encryption

A

• All wireless computers are radio transmitters and
receivers - anyone can listen in

  • Solution: Encrypt the data
    • Everyone gets the password
    • Or their own password

• Only people with the password can transmit and
listen
• WPA and WPA2

2
Q

WPA (Wi-Fi Protected Access)

A

• 2002: WPA was the replacement for serious
cryptographic weaknesses in WEP (Wired Equivalent
Privacy)
• Don’t use WEP

• Needed a short-term bridge between WEP and
whatever would be the successor
• Run on existing hardware

• WPA: RC4 with TKIP (Temporal Key Integrity Protocol)
• Initialization Vector (IV) is larger and an encrypted
hash
• Every packet gets a unique 128-bit encryption key

3
Q

Temporal Key Integrity Protocol

A
  • Mixed the keys
    • Combines the secret root key with the IV

• Adds sequence counter - prevents replay attacks

  • Implements a 64-bit Message Integrity Check
    • Protects against tampering
  • TKIP has it’s own set of vulnerabilities
    • Deprecated in the 802.11-2012 standard
4
Q

WPA2 and CCMP

A

• WPA2 certification began in 2004
• AES (Advanced Encryption Standard) replaced RC4
• CCMP (Counter Mode with Cipher Block Chaining
Message Authentication Code Protocol) replaced
TKIP

  • CCMP block cipher mode
    • Uses AES for data confidentiality
    • 128-bit key and a 128-bit block size
    • Requires additional computing resources

• CCMP security services
• Data confidentiality (AES), authentication, and access
control

Decks in CompTIA N10-007 Network+ Class (86):