What type of security is associated with each level of the OSI model?
The OSI reference model for networking (ISO 7498-1) is designed around seven layers arranged in a stack. The OSI security architecture reference model (ISO 7498-2) is also designed around seven layers, reflecting a high level view of the different requirements within network security.
|Layers (ISO 7498-1)
|ISO 7498-2 Security Model
|Assurance / Availability
|Notarization / Signature
Here's a very good paper on OSI model in reference to information security, by SANS Institute.