SoapCore now supports CampSmalltalk's SRP (State Replication Protocol).
http://wiki.cs.uiuc.edu/CampSmalltalk/About+State+Replication+Protocol+(SRP)

You may download the latest version from the site. 

Or use the SqueakMap.
http://map1.squeakfoundation.org/sm/package/bae4b8c3-210f-48b6-8819-eae30354d021

'srp21006.zip' is a copy for convenience.
Just file-in "CstMessengerSupport.st" and "PlbStateReplicationProtocol.st".

To enable SRP encoding in SoapCore, you need to edit the line in the root 'install.st'.
"soapSrpEncInstall := false" -> "soapSrpEncInstall := true" 

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["masashi | ^umezawa]