Wireless Security Midterm

Formulas

100

This is the formula for period

What is T = 1/f?

200

This is the formula for wavelength

What is c/f

300

This is the formula for MIMO channel modeling

What is Y = HX + N?

400

This is the complex representation of a signal

What is Ae^j2πft?

500

This is the equation for Free-Space Path Loss

What is Pt / Pr = ( 4𝜋d / 𝜆 )^2

Standards & Policy

100

This organization handles regulations for radio communications

What is the FCC?

200

This organization is responsible for WiFi standardization

What is IEEE?

300

This type of equipment is illegal to own, operate, or sell

What is jamming?

400

These bands are unlicensed (open for public use but subject to rules regarding interference)

What are U-NII and ISM?

500

What is the general EIRP limit on 2.4 GHz and 5-6 GHz?

What is 4W (36 dBm)?

WiFi

100

This technology, introduced in 802.11ac, uses multiple antennas to transmit to multiple users at a time

What is MU-MIMO?

200

This WiFi standard introduced bandwidths up to 320 MHz

What is WiFi 7 (802.11be)?

300

This technology uses time-frequency divisions to allow multiple concurrent users

What is OFDMA?

400

This is the range of frequencies used in WiFi 6 (802.11ax)

What is 1-7 GHz?

500

This is a vulnerability in WEP caused by IV reuse and cryptographic design

What is IV collison?

PHY-Layer Security

100

This category of attacks is primarily privacy-related and does not involve transmitting

What is passive?

200

These are the three main types of jamming

What are Constant, Random, and Reactive?

300

This security mechanism helps defend against MitM attacks by preventing impersonation

What is mutual authentication?

400

This security mechanism prevents narrow-band jamming and eavesdropping

What is FHSS?

500

This physical security measure involves using jamming and destructive interference to prevent eavesdropping

What is friendly jamming?

Quick Maths

100

This is equivalent to 2 in the linear scale

What is 3 dB?

200

This is the transmission rate of a QPSK symbol with 10 symbols/second

What is 20 bps?

300

This is -29 dBm converted to mW

What is 1/800?

400

This is the capacity of a channel with 20 MHz bandwidth and an SINR of 0 dB

What is 20 Mbps?

500

This is a possible delay (in seconds) that would result in constructive interference for a 50 Hz periodic wave?

What is 0.5s * n where n is an integer (i.e. 1s, 5s, etc.)