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Re: three digital signature models ... for x9.59
actually the account-authority relies on the merchant to check
the card to see if it is valid and that other things look correct ...
since the account-authority can't do those things in the
non-face-to-face physical world. the neat thing about
digital signatures is that it provides the ability for the
account-authority to verify authenticity w/o having
to be there ... eliminating unnecessary & redundant
checks by the merchant.
some of the characteristics of the current physical process
are the limitations of the account-authority being able to
authenticate account-owner in the non-face-to-face operation;
it therefor relies on the merchant to act as stand-in for some
of those operations. given digital signature means for the
account-authority to reliably & efficiently authenticate the
account-owner in non-face-to-face (at least between the
account-authority and the account-ownder) transactions ... it is no
longer necessary to obfuscate the process with a merchant
stand-in ... the account-authority uses digital signature for
directly authentication for performing the transaction.
in the x9.59, account-transaction scenerio ... the point is
that it is pretty superfulous/redundant to have extra
verification processes other than the one necessary to
execute the transaction by the account-authority.
The account-authority registers the digital signature
the same way it does a standard signature ... and then
performs the verification efficiently and securely as
part of executing the transaction.
numerous other kinds of operations may find it
advantages to select other modes of using
digital signatures ... however, in account-based
transactions, many of the other modes would involve
unecessary, superfulous and/or redundant operations
that wouldn't directly contribute to the sucessful execution
of the transactions. they also may represented unecessary
and/or redundant administrative processes that represent
little or no value for the account-authority.