6.1.2 Cost without auditing and without authorization

Another recurring activity are the frequent calls to the PDPs. Following table explores how much could be saved by optimising these calls.

Table 7:Table 6.4: Cost of TAS³ single use scenario without auditing and without authorization

Operation	IdP + Disc.	Frontend	Responder
1. SSO	1T+2S+2X=5.5	3T+2S+4X=10.5
2. Discovery	1T+2S+2X=5.5	T+S+X=3.5
5. Send request		1T+1S+1X=3.5	1T+2S+1X=4.5
7. Payload
9. Send response		S+X=2	S+X=2
11. Process Oblig		T+X=2.5	T+X=2.5
12. SLO	T+S+2X=4.5	T+S+2X=4.5
TOTAL	3T+5S+6X=15.5	7T+6S+10X=26.5	2T+3S+3X=9

The grand total without audit and without authorization is 12T+14S+19X+0Z=51 RSA operation equivalents. The authorization steps (excluding Audit Bus related authorization) seem to be adding about as much over head as the entire rest of the web service call.

The bare ID-WSF 2.0 web service call compares relatively favorably with bare unsecure web service call: 51 vs. 8.5 - only 6 times heavier.