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Kerberos: An Authentication Service for Open Network Systems

Kerberos is a trusted third-party authentication service designed for open network systems. It employs secure private key encryption to ensure secure communications. With its ticket-based authentication, Kerberos provides transparency by allowing reusable tickets while maintaining session integrity with authenticators. It is scalable and reliable, featuring master and slave authentication databases that replicate every hour. This research also addresses open issues like ticket lifetime, workstation program integrity, and the advantages of centralized authentication, emphasizing the balance between security and performance.

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Kerberos: An Authentication Service for Open Network Systems

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  1. Kerberos: An Authentication Service for Open Network Systems J. G. Steiner, C. Neuman, J. I. Schiller

  2. What is Kerberos? • Trusted third-party authentication service • Requirements: • Secure (Private Key Encryption) • Transparent (Tickets) • Scalable (Replication) • Reliable

  3. Kerberos Authentication Protocols TGS Kerberos Server Client

  4. Security

  5. Transparency • Tickets are reusable (authenticators are not) • {s,c,addr,timestamp,life,KS,C}KS • Ticket-granting ticket can occur at login • (8 hour lease), kinit for new TGT • Library calls: • krb_mk_req, krb_rd_req, krb_mk_prv, krb_rd_prv

  6. Scalability & Reliability • Slave (Read Only) Authentication Databases • Master Kerberos DB used for (Write) Administration Requests • Entire DB is propagated every hour • Common transactions can take place with replicated (Slave) servers

  7. Open Issues & Questions • Ticket Lifetime? (Short-term Playback) • Integrity of workstation programs? • Scalability between realms? • Centralized authentication with Private-Key encryption advantages/disadvantages over Public-Key?

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