add anti-censorship workshop slides

slides/censorship/censorship.md

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+# Anti-censorship software
+
+# Censorship
+
+- Blacklist vs whitelist
+- DPI
+- Active inspection
+- DDoS
+- Legal and financial
+
+# Centralized, Federated, Distributed
+
+- Centralized < federated < distributed (P2P)
+- More about this next monday
+
+# Torrent
+
+- P2P
+- Trackers and DHT
+- Legal issues (Europe): using, sharing, hosting 
+
+# Torrent
+![DHT](slides/censorship/dht.jpg)
+
+# Blockchain
+
+- Just P2P
+- Decentralized ordering
+- Financial censorship (Wikileaks, Autistici/Inventati, etc.)
+
+# HTTP
+
+- Web proxy
+- HTTP proxy
+- Signal
+
+# SOCKS5 proxy
+
+- Transport layer
+- UDP ok
+- SOCKS5h
+
+# Hosting censorship
+
+- DNS censorship (TPB,Autistici/Inventati)
+- Hosting provider choice
+- Crypto payment for Domain and Hosting
+- Self-hosted
+
+# Tor
+
+- Created in 2002 by US Navy
+- Low latancy
+- Timing attack
+- TCP only
+- Hidden services (onion)
+- Bridges
+- Obfsv4
+
+# Tor
+![Tor](slides/censorship/tor.jpg)
+
+# I2P
+
+- Forked form Hyphanet (Freenet) in 2003
+- High latency
+- Timing attack resitant
+- Better donors and origin
+- It's own DNS (like Tor)
+- Cant go outside of I2P network
+- Torrenting is ok (special clients exist)
+- Monero version
+
+# I2P
+![I2P](slides/censorship/i2p.jpg)
+
+# VPNs
+
+- Not as good as previous (longevity and privacy)
+- DIY
+
+# Proxychains
+
+- Tor->I2P not allowed since July 2024
+- Tor->SOCKS easy way to fix tor exit node issues
+