The cloud can be secure if you know what to use to secure it:
- Private or dedicated firewalls
- Intrusion Detection Devices (IDS)
- Intrusion Protection System (IPS)
- Data encryption
- A private cloud/dedicated hardware so you know where your applications and data are, and you know you're the only tenant using the cloud's resources (as opposed to multi-tenant, shared/public clouds).
Read more about the
Top 5 Tips for Cloud Computing Security.