`SSH`

`known_hosts`

Data Analysis

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

#### [Data Summary]

- Total number of submissions: 179
- Total number of distinct hosts from which we received submissions: 175
- Total number of submissions that ran our script as root: 69
- From what top level domains did the study draw its participants?

- Total number of active users in the data set: 2,480
- Total number of edges (
`known_hosts`

entries): 37,771 - Total number of unique
`known_hosts`

destinations: 12,041

#### [SSH Server Topology]

- Interdomain Connectivity

- Intradomain Connectivity (
`a.edu`

)

- Connectivity Graph in Progress

- How many class As (Bs) are reachable?
| Count | Percentage |

class As | 107 | 67% |

class Bs | 1,454 | 4% |

*Note that we exclude unallocated or private address space
(valid class As: 160 and valid class Bs: 40,930)

#### [User Statistics]

- Distribution of the number of distinct
`known_hosts`

entries per user

- Percentage of identity keys encrypted: 38.3% (171 out of 447 SSH2 identity key files)
- Total number of distinct edges where source user has an identiy key: 7,817
- Total number of distinct edges where source user has an unencrypted identity key: 4,314