5.3.1 Encryption Levels
Standard RDP Security (section 5.3) supports four levels of encryption: Low, Client Compatible, High, and FIPS Compliant. The required Encryption Level is configured on the server.
Low: All data sent from the client to the server is protected by encryption based on the maximum key strength supported by the client.
Client Compatible: All data sent between the client and the server is protected by encryption based on the maximum key strength supported by the client.
High: All data sent between the client and server is protected by encryption based on the server's maximum key strength.
FIPS: All data sent between the client and server is protected using Federal Information Processing Standard 140-1 validated encryption methods.