Who Uses Covert Channels? (cont)

Internal users who 

Want to use forbidden protocols:
SSH to personal mail machine
Access P2P networks
Instant Messaging

Want to have non-malicious back door access:
Work from home via inbound SSH tunnel.
Access company-internal websites from home.

Want to avoid having management/etc see their actions:
Access questionable content from work
Applying for job with competitors
Corporate 'spies'