How To Get A Computer With A Cell Phone And A Computer (For Free)
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1 Remote Access & Security Technology Overview Medizinische Technik Erlangen Markus Feeß Netze / Sicherheit SGK 2 1
2 John and the broken leg - Part I Archiv A? B C 2
3 WAN Technologies GSM Global System for Mobile Communications POTS Plain Old Telephon Service ISDN Integrated Services Digital Network DDV Datendirektverbindung xdsl Digital Subcriber Line GAN ATM Global Area Network Asynchronous Transfer Mode 3
4 GSM Global System for Mobile Communications Irda GSM POTS Derzeit: max 9600 bits/sec Ende 99: HSCSD (HighSpeed Circuit Switched Data) mit 28,8kbps - eplus Mitte 00: GPRS mit 9, kbps variabel 02: UMTS (Universal Mobile Telecommunications System) bis zu 2 Mbps 4
5 Digitale Datenverbindung DDV Only one partner Deutsche Telekom: e.g. D64S, D64S2 6
6 DK Konfigurator 8
7 DK Konfigurator 9
8 10
9 Bandwidth hungry Online/ Internet and Business services Entertainment Movies Transaction Services Homebanking ShopStop Fast Internet LAN connection Games What you need... Interactive Learning... your existing telephone line and a PC. Teleworking e.g. Joint Editing News 11
10 14
11 Security Policy RFC Maintain a written Policy 16
12 Ausgewogenheit Connectivität Performance Transparenz Authentication Authorization Accounting Verfügbarkeit Vertraulichkeit Zugang Sicherheit 17
13 18
14 Router / Network Security Access Control Closed Usergroup (Germany: GBG) Calling Line Identifikation Callback CHAP / PAP Packet Filter Not released! Encryption Radius Server 19
15 20
16 Encryption Router / Network Security IOS (3620/40) - 56 Bit Key DES Babylon Bit Key DES Not released! Modem Encryption Not compatible because of missing standards 21
17 Kosten / Zeitaufwand zum Hacken der DES Schlüssel Type of Attacker Budget 40-Bit 56-Bit 168-Bit 3DES Individual Hacker $400 5 Hours 38 Year Too Long Dedicated Hacker $10, Minutes 556 Days Years Intelligence Community $10m 0.02 Sec 21 Minutes Years Source: Blaze et al, Scheiner
18 Ebenen der Verschlüsselung Application- Layer Application Headers im Klartext Network-Layer Netzwerk- und Transport Header im Kartext Application-Layer Encryption Network-Layer Encryption SSL IOS Encryption Link-Layer Datalink Header im Klartext Link-Layer Encryption Link-Layer Encryption 24
19 25
20 Security Architecture - IPsec RFC 1825 beschreibt die Architektur Bietet sich an für: Authentifizierung Privacy unterstützt IP Version 4 und IP Version 6 herstellerunabhängige Verschlüsselung 26
21 27
22 Protokollstack Firewall (proxy) intern Application Presentation Session Transport Packetfilter Network Physical Data-Link IPFORWARDING = 0 extern 28
23 Zweistufiges Firewall Design extern Internet nur von innen nach außen intern kontrollierter Zugang über Screening Router (Access Control Lists) Public WWW Public FTP Server in DMZ DNS Mail Intranet 29
24 VPDN (Virtual Private Dialup Network) ATM Encrypted VPN Workgroup IBM Core Intranet Home Gateways ISP Virtual Private Dialup Network 31
25 John and the broken leg - Solution Video Live 200 Archiv Bingo A 4/8 S 0 S 0 ISDN 4/8 S 0 Cisco 3620/40 B Cisco 3620/40 Video Live 200 C 32
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