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This is a new feature introduced with Samba 3\&.2 and above\&. It is an extension to the SMB/CIFS protocol negotiated as part of the UNIX extensions\&. SMB encryption uses the GSSAPI (SSPI on Windows) ability to encrypt and sign every request/response in a SMB protocol stream\&. When enabled it provides a secure method of SMB/CIFS communication, similar to an ssh protected session, but using SMB/CIFS authentication to negotiate encryption and signing keys\&. Currently this is only supported by Samba 3\&.2 smbclient, and hopefully soon Linux CIFSFS and MacOS/X clients\&. Windows clients do not support this feature\&.