WSE 3.0 Client - how to specify the key encryption method - config file being ignored

Question

I've implemented a WSE 3.0 Client that encrypts it's message body. The soap envelope has the following elements:

<xenc:EncryptedKey xmlns:xenc="http://www.w3.org/2001/04/xmlenc#"&gt;
<xenc:EncryptionMethod Algorithm="http://www.w3.org/2001/04/xmlenc#rsa-oaep-mgf1p"&gt;
<ds:DigestMethod mlns:ds="http://www.w3.org/2000/09/xmldsig#" Algorithm="http://www.w3.org/2000/09/xmldsig#sha1"/&gt;

...

How do I change the Encryption Method Algorithm to be RSA-15?

The Exception I get is: Unauthorized key encryption method: http://www.w3.org/2001/04/xmlenc#rsa-oaep-mgf1p.

I've tried adding this to my web.config file but it seems to be getting ignored:

    <microsoft.web.services3> 
<security> 
<binarySecurityTokenManager> 
<add valueType="http://www.docs.oasis-open.org/wss/2004/01/oasis-200401-wss-x509-token-profile-1.0#X509v3" type="Microsoft.Web.Services3.Security.Tokens.X509SecurityTokenManager, Microsoft.Web.Services3, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"> <keyAlgorithm name="RSA15" /> </add> </binarySecurityTokenManager> </security> 
<diagnostics> 
<trace enabled="true" input="InputTrace.webinfo.xml" output="OutputTrace.webinfo.xml"/> <detailedErrors enabled="true"/> </diagnostics> </microsoft.web.services3>

In fact this whole section is being ignored as the trace files in diagnostics are never created.

Can anyone help with either of these problems?

Thanks Kristina