Week 7 - Information Theory (Entropy) Flashcards
1
Q
What does this mean for our OSINT Investigations - Risk of Compromise
A
- IP address
- Cookies
- User agent strings
- Browser Fingerprints
2
Q
What is entropy
A
Measure of uncertainty
3
Q
What is the equation?
A
- ΔS = - log2 Pr(X=x)
- ΔS –> change of uncertainty
- Pr = Probability
- Negative –> probability decreases, amount of info increases
- Uncertainty is changed by the amount calculated
4
Q
Why is Information theory, important:
A
- identifying people who want to stay anonymous
- Keeps ourselves safe online, avoids tipping off our targets while conducting OSINT
- Finds information about anything, regardless of how little we know to start with
5
Q
How many bits of data are required to uniquely identify a single person?
A
log2(2^33) = 32.9 = 33 bits (8 billion people in the world
