Lets get back to basics, why do Government authorities want access to your encrypted data?
A). They don't trust people
B). They are looking for signs of terrorism, subversives or other indicators
C). You are using a new cryptographic algorithm not within their current databases or one you created yourselves.
D). You live in a country, which is under oppressive central control, who want to make sure you are following the party line i.e. thinking the way they do? E.g. East Germany when it existed etc.
E). Researchers want to track and trace malware across borders for easy identification.
If you are using a proprietary cryptography method, which you have not asked the authorities approval or verification you can use it, is likely to stand out like a sore thumb - remembering that cryptographic methods and encryption methods are regarded as an "Act of War or an electronic weapon".
There is no such thing as a free lunch anywhere in the world - we are all suspicious, and everyone wants to protect their own borders regardless of who, what, where they exist.
> C). You are using a new cryptographic
> algorithm not within their current databases or one you created yourselves.
Not really a reason to want the traffic ...
You have obviously not been in a position of inventing a new cryptographic algorithm, where the Government cryptographic experts actually state you need to reduce the key length in order for them to allow you to use it.
By the way, they also stated had we not informed them, we would have been in big trouble. This is the UK experience.
As stated previously under agreed international export controls and Vienna Convention - encryption is regarded as a weapon of war.