Just take the time to read thru Lin Overby's SHARE presentation on
TCPIP and Cryptography.  It is excellent.

http://mobile.share.org/client_files/SHARE_in__Seattle/S3346LO213235.pdf

And it will answer all of your questions.

Rob Schramm
Senior Systems Consultant
Imperium Group



On Thu, Apr 12, 2012 at 9:04 AM, Staller, Allan <allan.stal...@kbmg.com> wrote:
> 1) If CPACF is available, I believe it will be used
> 2) IIRC, TLS uses symmetric key
> 3) Encryption generally incurs fairly significant overhead. IIRC, TCPIP
> will offload this work to a  zIIP if available.
>
> HTH,
>
> <snip>
> as the subject ,  a couple of questions to be clarified .
> from z10+ , with z/OS V1.11+
> 1) I know z/OS FTP client support SSL/TLS ,  But no idea whether the
> transferred data encrypted via HW crypto (CPACF) ?
> 2) If yes , what kind of key , symemtric key ? asymmestric key ?
> 3) is it signifcant CPU overhead comparing with none SSL ftping ?
> </snip>
>
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