Here are some of the subject terms you can use to find e-books in the EBSCO's E-Book Collection database:
computer crime
computer hackers
computer security
computer networks--security measures
contingency planning
crisis management
cryptography
cyber terrorism
data encryption
data protection
data recovery
disaster relief
electronic commerce--security measures
Internet--security measures
privacy--right of
ProQuest and EBSCO will help you locate case studies.