Security for the Internet Infrastructure
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1 Security for the Internet Infrastructure Paul A. Lambert February 10, 1997
2 Internet Infrastructure and Security Security for the Internet Infrastructure Datagrams, Messages Name Services/Directories, Routing, Time System Management Infrastructure for Internet Security Confidentiality, Integrity, Authentication Non-repudiation, Access Control Key Management Public Key Infrastructure Trust Management
3 Specific Topics (this presentation) IP Security (IETF IPsec) Protects IP Datagrams Key Management to create Security Associations W3C Digital Signatures (DSig) Label Systems for Assertions Semantic definition for Assertions Digitally Signed Web Content
4 Network Security Protects Datagrams leaves routing information unencrypted Provides end-to-end security host-to-host host-to-router router-to-router host-to-firewall Firewall-to-Firewall
5 IP Security - Secure Pipes Host Router/Firewall Host
6 IP Security - Multiple Encapsulation Host Router/Firewall Host
7 Network Layer Security - History Defense Research in Network Encryption PLI ( Early 70 s) IPLI (76) Blacker / Caneware / NES (80 s) Standards Secure Data Network System (86-91) Published by NIST SP3, SP4, Key Management Protocol (KMP) Network Layer Security Protocol (ISO - early 90 s) IPSEC (IETF - now)
8 IPsec - Network Layer Base Specifications Security Architecture for the Internet Protocol (RFC 1825) IP Encapsulating Security Payload (ESP) (RFC 1827) IP Authentication Header (AH) (RFC 1826) Other RFCs IP Authentication using Keyed MD5 (RFC 1828) The ESP DES-CBC Transform (RFC 1829) HMAC-MD5 IP Authentication with Replay Prevention (RFC 2085) HMAC: Keyed-Hashing for Message Authentication (RFC 2104)
9 IPsec - Key Management IPsec Base Key Management - ISAKMP/Oakley SKIP Internet Security Association and Key Management Protocol (ISAKMP) The resolution of ISAKMP with Oakley Inline Keying within the ISAKMP Framework. The Internet IP Security Domain of Interpretation for ISAKMP (31320 bytes) SKIP Algorithm Discovery Protocol SKIP Extensions for IP Multicast SKIP extension for Perfect Forward Secrecy (PFS) Simple Key-Management For Internet Protocols (SKIP) Photuris
10 IP Security in the Internet ISAKMP/Oakley - vendor implementations SKIP Implementations S/WAN Swan and Linux
11 IP Security - References IETF - IP Security Freeware Network Encryption Plan Secure WAN Testing IP Security Background
12 W3C Digital Signatures Started with code signing ActiveX Signatures are only Binary (yes/no to submit to Microsoft policy) Generalized to allow assertions on any information object First target is Web Page labeling Built on PICS, Web Content Labeling (Platform for Internet Content Selection) PICS Metalanguage for Rating Systems PICS Labels or Assertions
13 Semantics for Assertions X.509 Version 3 Extensions Simple Public Key Infrastructure (SPKI) Assertions W3C Digital Signatures (DSig) PICS used as metalanguage for Assertions Trust Modeling and Policy Engine
14 W3C DSig Metalanguage defines labels includes human readable definitions machine readable format Signature Block binds: rating system assertion (PICS label from rating system) referent (source) target (hash and URL) digital signature Trust Modeling based on Assertions
15 Dsig Label Example (n 1 v 3)
16 W3C DSig W3C DSig Applications Web content rating Active content manifests Software Licensing Benefits: Improved Granularity of Authorization (as compared to binary) Flexible policy creation Common model for trust management References -
17 Summary IP Security could provide a strong base security mechanism for the Internet (75% solution) Too many protocol specific mechanisms Trust management and assertions would support manageable security distributed security management (Federation) need good delegation
18 Infrastructure Security - Issues Network Security IPSEC - SSL/TLS/PCT - PPP security - SSH Key Management SSL - ISAKMP - SOCKS - PPP - IEEE Certificates Mail X DNS - PGP - W3C DSig PEM - MOSS - S/MIME
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