This optional parameter specifies whether or not to check if
the challenge has been corrupted before validation. Value can be 0 to
4:
- 0: No password checking
- 1: Check the parameter then verify (default)
- 2: Always use the DPData to validate responses
- 3: Avoid Challenge-Response Replay Attack by allowing only one
challengeresponse authentication per timestep
- 4: Avoid Challenge-Response Replay Attack by rejecting the second
response if responses from two consecutive authentication requests are
equal and in the same time-step