6. Anonymous Communications

Question 1

Does TLS provide anonymity?

Answer 1

No

Question 2

It’s possible to tell which user connects to which service through the use of a proxy.

Answer 2

True

Question 3

What is a mixnet?

Answer 3

Arbitrary network of mixes

Question 4

A single good mix can guarantee anonymity.

Answer 4

True

Question 5

Name 2 disadvantages of basic mixnets

Answer 5

1. Pk encryption and decryption at each mix is computationally expensive
2. Basic mixnets have high latency

Question 6

What are 2 ways of preventing a predecessor attack?

Answer 6

1. Frequent circuit changes
2. Using entry guards (pre-selected trusted nodes)

Question 7

What are 3 conditions under which a relay may become a guard?

Answer 7

1. Long and consistent uptimes
2. High bandwidth
3. Manually vetted

Question 8

What is the domain suffix of anonymous hidden services reachable via the Tor network

Answer 8

.onion

Question 9

What are hidden services and what do they allow?

Answer 9

Websites or services only accessible through the Tor network. They allow users to host services anonymously, protecting the server’s location and the user’s identity.

Question 10

What’s the main purpose of tor bridges?

Answer 10

Many countries block traffic to IP addresses of Tor relays (public info in consensus file). Tor bridges are used to connect clients in censored areas to rest of Tor network.

Question 11

All Tor nodes (except bridges) are publicly known.

Answer 11

True