add tor slides

slides/tor/tor.md

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+# Tor, Relays, Onions
+
+# Tor
+
+- Hides IP address
+- Hard to censor
+- Timing attack
+
+# Relays
+
+- Middle relays
+- Guard relays
+- Exit relays
+
+# Onion services
+
+- Hides IP address
+- Any TCP service
+- No DNS, no SSL
+- Private keys