Will extensibility lead to vulnerability?

[burnburn]

Question from @David-Chadwick that needs to be addressed in the spec.

[David-Chadwick]

Yes it does. I have indicated how one attack can work in PR #159

[David-Chadwick]

PR #159 is technically flawed for reasons I have identified there. Consequently it should be removed until correct text can be agreed to

[burnburn]

PR merged. Closing.