There shouldn't be a need for any petition. A government with the illusion that it can "ban encryption" has already lost all authority and credibility, so should not be governing anyone.
I think this is important and have emailed two friends (a doctor and a lawyer) to ask them to sign it. I described it as:
'It may be similar to how you feel when you watch a B movie lawyer or doctor "making a professional decision". The only difference being I'm watching the people who are running this country.'