This has been asked recently:
Wondering if it is possible to change the level of encryption that is being used. I am not even sure if it is possible or if it is controlled by the site we are connecting to.
For example we are connecting to host and we are using aes128-ctr hmac-md5. They say they support, hmac-sha2-256. Is it possible to force the connection to use a specific encryption level.
You can set the encryption when doing a file transfer with UC_AS_SETTINGS in client 0000. The options are as follows-
Allowed values: "NO", "AES-128", "AES-192" and "AES-256" (default)
"NO" - No encryption method
"AES-128" - 128-bit key length
"AES-192" - 192-bit key length
"AES-256" - 256-bit key length
256-bit is the default value. This will be used with all filetransfer jobs.
The RA FTP agent will not use this. Basically if you use this type of filetransfer you can use SSL or SFTP and define the encryption level.
More information please check the following documents: