Slot 2 is the default. Secret must be supplied when creating the file,
and when modifying the file in the absense of the token. Password is
used to construct the challenge. If not supplied empty string is used.
Slot 2 is the default. Secret must be supplied when creating the file,
and when modifying the file in the absense of the token. Password is
used to construct the challenge. If not supplied empty string is used.