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rclone cryptdecode 
Cryptdecode returns unencrypted file names.
Synopsis 
Returns unencrypted file names when provided with a list of encrypted file names. List limit is 10 items.
If you supply the --reverse flag, it will return encrypted file names.
use it like this
rclone cryptdecode encryptedremote: encryptedfilename1 encryptedfilename2
rclone cryptdecode --reverse encryptedremote: filename1 filename2
Another way to accomplish this is by using the rclone backend encode (or decode) command. See the documentation on the crypt overlay for more info.
rclone cryptdecode encryptedremote: encryptedfilename [flags]Options 
  -h, --help      help for cryptdecode
      --reverse   Reverse cryptdecode, encrypts filenamesSee the global flags page for global options not listed here.
See Also 
- rclone - Show help for rclone commands, flags and backends.