I'll take that as a "yes" ;)
AFAIK, neither signatures or "something you have, know" alone fixes replay attacks. Since this is a well known problem in cryptography, many solutions exists. All of which are probably overkill for this use.
AFAIK, neither signatures or "something you have, know" alone fixes replay attacks. Since this is a well known problem in cryptography, many solutions exists. All of which are probably overkill for this use.