After reviewing the specs on RDP 5.4 and 5.3, they do contain the same encryption levels as RDP 6. These levels are:
- 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. Clients that do not support this level of encryption cannot connect.
- FIPS: All data sent between the client and server is protected using Federal Information Processing Standard 140-1 validated encryption methods. Clients that do not support this level of encryption cannot connect.
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