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I2P – Anonymous Low Latency Networking

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I2P – Anonymous Low Latency Networking Anonymität ist nicht binär. Oder: ein erfolgreicher Versuch, ein sicheres und anonymes Netzwerk zu erstellen. www.i2p2.de Übersicht I2P ist TOR ähnlich! Geringe Latenz auf den Verbindungen Verbindung von Quelle zu Ziel über mehrere andere Router Mehrfache Verschlüsselung auf diesem Wege Jeder Client kann Router, Teilnehmer oder Exit-Node sein Unterschiede zu TOR I2P ist ein INTERNES Netz und nicht auf ExitNodes angewiesen I2P filtert im Client aus manchen Verbindungen verräterische Daten aus (z.B. IP Adressen beim IRC connect) I2P hat frei wählbare Tunnellängen (in sinnvollen Grenzen) Der Weg Quelle – Ziel nutzt 2 Tunnel, von dem jeweils die Quelle und das Ziel einen kontrollieren (Länge, Anzahl) Tunnel werden alle 10 Minuten verworfen und neu aufgebaut I2P hat keine zentrale Kontrollinstanz, sämtliche Routinginformationen werden von den Routern selber aus eigenen Statistiken gewonnen Zahlen Größe: ca. 800-1000 Router zu jeder Zeit aktiv Ca. 650 Server (leasesets) Router aus ca. 40 versch. Staaten Latenz ca. 0.5-4 sec im IRC Transferraten von ca. 10-30 kb/sec im Schnitt Ca. 100-400 aktive Connections (UDP und TCP) IRC, Gnutella Client, torrent Clients, edonkey Client in extra angepassten Versionen Z.Z. 2 aktive Hauptentwickler und diverse weitere FloodFill Router Datenbank auf 1-n untrusted FloodFill Router, speichert die Leasesets Leaseset ist die Information, wie eine Destination erreicht werden kann Destination: 516bit++ base64 encoded String als ID (auch key-signed) oder base 32 Representant für einen Hash der ID (xvr…a.b32.i2p) Max. Lebensdauer eines Leasesets: 10 Minuten, danach werden neue Tunnel aufgebaut und in einem neuem Leaseset publiziert I2P Router fragen die FloodFill Router nach einem Leaseset für eine Destination Z.Z. 6 FloodFill, sollte bis ca. 100.000 Router ausreichen – bis dahin muss ein Ersatz gefunden sein Routing Für eine „normale“ IRC Verbindung werden gewöhnlich 4 Tunnel aufgebaut: Der Server baut einen IN-Tunnel auf und publiziert den Startpunkt des Tunnels in seinem Leaseset Der Client baut einen OUT-Tunnel auf und sendet die Daten durch diesen Tunnel Die Daten gehen durch den OUT Tunnel zum Startnode des IN Tunnel und durch den zum Server Der Weg vom Server zum Client geschieht unter Austausch der Begriffe Server/Client (auch wieder mit der Unterteilung IN/OUT Tunnel) Quelle und Ziel können frei über die Anzahl der Hops (Router zwischen Start und Endpunkt des Tunnels) und Anzahl der Tunnel wählen (bisher auf 5 Hops und 3 Tunnel beschränkt in der GUI) Routing Verschlüsselung Verschlüsselung der Daten wird auf 3 Ebenen ausgeführt „Garlic“ Encryption Tunnel Encryption Inter-router Transport Encryption ElGamal/AES+SessionTag Encryption meistens, 2048 ElGamal und 256bit AES in CBC mode mit PKCS#5 padding für 16 byte blocks Mehr infos unter: http://www.i2p2.de/how_cryptography Verschlüsselung Tunnel Eines der zentralen Elemente von I2P 2 verschiedene Tunnel-Klassen: Exploratory Tunnels – Werden wie normale Tunnel aufgebaut, Datenerhebung für Erreichbarkeit und Geschwindigkeit der anderen Router werden hierrüber erhoben Client Tunnels – die eigentlichen „Daten“ Tunnels, Applikationen senden ihre Daten durch diese Tunnels Participating Tunnels – andere Tunnel die durch den Router geroutet werden (nur Anzahl limitierbar) Applikationen Eingebaute Applikation als java-Applet im Browser auf der Statuskonsole aufrufbar: Susimail – einfacher Zugriff auf anon Email Dienst postman.i2p SusiDNS – einfache HostDB (hosts.txt) Verwaltung I2PSnark – Snark torrent Client im Browser für I2P Dazu diverse andere Clients: Imule – emule client für I2P (ggf. MIT integriertem I2P router => get it, start it, use it) I2Phex – Phex Gnutella Client für I2P angepasst Robert /i2p.bytemonsoon tracker – bittorrent client/tracker Fazit I2P hat vieles eingebaut um „sicher“ zu sein Einfacher Betrieb möglich Latenzzeiten sind gering genug für Chats Kein TOR Ersatz – nicht als anonymen Zugriff aufs normale Netz gedacht Höhere CPU Last durch viel En/Decryption und hohe Anzahl von Tunnel „hohe“ Bandbreite (>30 kb/sec) nötig um eigenen Traffic in fremden Traffic zu „verstecken“ Live-Show Windows mit SSH Tunnel auf root server mittels Putty Fragen?.
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