Paul Gilmartin wrote:
[...]
How have eBay and PayPal addressed this problem?  If client certificates
or secondary authentication prevent D-o-S attacks which would keep
their administrators pretty busy, can't those techniques be adapted
to TSO logons?

Good point.
However I strongly doubt wether eBay or PayPal userids are kept in RACF db. As far as I know such solutions, customer db and user (technical) db are completely separate. So, the example of eBay is inapplicable.

--
Radoslaw Skorupka
Lodz, Poland


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