private void OnServiceConfigurationCreated( object sender, ServiceConfigurationCreatedEventArgs e )
{
    List<CookieTransform> sessionTransforms = new List<CookieTransform>( new CookieTransform[]
    {
        new DeflateCookieTransform(),
        new RsaEncryptionCookieTransform( e.ServiceConfiguration.ServiceCertificate ),
        new RsaSignatureCookieTransform( e.ServiceConfiguration.ServiceCertificate )
    } );

    SessionSecurityTokenHandler sessionHandler =
        new SessionSecurityTokenHandler( sessionTransforms.AsReadOnly() );

    e.ServiceConfiguration.SecurityTokenHandlers.AddOrReplace( sessionHandler );
}

<microsoft.identityModel>
  <service>
    <serviceCertificate>
      <certificateReference x509FindType="FindByThumbprint" findValue="C7FD338059CCB374798923A915BC91B718814A8E" storeLocation="LocalMachine" storeName="TrustedPeople" />
    </serviceCertificate>
  </service>
</microsoft.identityModel>

System.Security.Cryptography.CryptographicException: ID1014: The signature is not valid. The data may have been tampered with.
at Microsoft.IdentityModel.Web.RsaSignatureCookieTransform.Decode(Byte[] encoded)
at Microsoft.IdentityModel.Tokens.SessionSecurityTokenHandler.ApplyTransforms(Byte[] cookie, Boolean outbound)
at Microsoft.IdentityModel.Tokens.SessionSecurityTokenHandler.ReadToken(XmlReader reader, SecurityTokenResolver tokenResolver)
at Microsoft.IdentityModel.Tokens.SessionSecurityTokenHandler.ReadToken(Byte[] token, SecurityTokenResolver tokenResolver)
at Microsoft.IdentityModel.Web.SessionAuthenticationModule.ReadSessionTokenFromCookie(Byte[] sessionCookie)
at Microsoft.IdentityModel.Web.SessionAuthenticationModule.TryReadSessionTokenFromCookie(SessionSecurityToken& sessionToken)
at Microsoft.IdentityModel.Web.SessionAuthenticationModule.OnAuthenticateRequest(Object sender, EventArgs eventArgs)
at System.Web.HttpApplication.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

void CustomSessionAuthenticationModule_SessionSecurityTokenReceived( object sender, SessionSecurityTokenReceivedEventArgs e )
{
    DateTime now = DateTime.UtcNow;
    DateTime validFrom = e.SessionToken.ValidFrom;
    DateTime validTo = e.SessionToken.ValidTo;

    double tokenLifetime = (validTo - validFrom).TotalMinutes;

    SessionAuthenticationModule sam = sender as SessionAuthenticationModule;

    if( now < validTo && now > validFrom.AddMinutes( tokenLifetime / 2 ) )
    {
        e.SessionToken = sam.CreateSessionSecurityToken(
            e.SessionToken.ClaimsPrincipal, e.SessionToken.Context,
            now, now.AddMinutes( tokenLifetime ), e.SessionToken.IsPersistent );
        e.ReissueCookie = true;
    }
}