SSH known_hosts Data Analysis

Last updated: Mon Sep 12 14:28:52 2005

[Data Summary]

  1. Total number of submissions: 179
  2. Total number of distinct hosts from which we received submissions: 175
  3. Total number of submissions that ran our script as root: 69
  4. From what top level domains did the study draw its participants?
  5. Total number of active users in the data set: 2,480
  6. Total number of edges (known_hosts entries): 37,771
  7. Total number of unique known_hosts destinations: 12,041

[SSH Server Topology]

  1. Interdomain Connectivity
  2. Intradomain Connectivity (a.edu)
  3. Connectivity Graph in Progress
  4. How many class As (Bs) are reachable?
     CountPercentage
    class As10767%
    class Bs1,4544%
    *Note that we exclude unallocated or private address space (valid class As: 160 and valid class Bs: 40,930)

[User Statistics]

  1. Distribution of the number of distinct known_hosts entries per user
  2. Percentage of identity keys encrypted: 38.3% (171 out of 447 SSH2 identity key files)
  3. Total number of distinct edges where source user has an identiy key: 7,817
  4. Total number of distinct edges where source user has an unencrypted identity key: 4,314