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  1 Chapter 10: Key Management in Public key cryptosystems Fourth Edition by William Stallings Lecture slides by Lawrie Brown (Modified by Prof. M. Singhal, U of Kentucky)  2 Key Management ã public-key encryption helps address key distribution problems ã have two aspects of this:  – distribution of public keys  – use of public-key encryption to distribute secret keys  3 Distribution of Public Keys ã can be considered as using one of:  – public announcement  – publicly available directory  – public-key authority  – public-key certificates  4 Public Announcement ã users distribute public keys to recipients or broadcast to community at large  – E.g., append PGP keys to email messages or post to news groups or email list ã major weakness is forgery  – anyone can create a key claiming to be someone else and broadcast it  – until forgery is discovered can masquerade as claimed user

Chapter 04

Jul 23, 2017
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