- Layer 1 No common encryption is done on this layer
- Layer 2 No common encryption is done on this layer
- Layer 3 IPsec - typically implemented by software
- Layer 4 Neither TCP nor UDP offers any encryption methods
- Layers 5, 6, 7 Important encryption standards (SSL/TLS) happen on these layers, but don’t fit cleanly into the OSI model.
Encryption and OSI