No, breaking an encryption is all about knowing how it works, many cryptographers make their algorithm proprietary in hopes that an attacker will have a hard time figuring how it works, however they turn out to be weak, other encryption algorithms are developed in the open so that many people look at it and see the flaws
The key word is : weak The idea is not making a backdoor directly, the idea is making it flawed, it’s like securing a bank with steel doors with the exception of one door, that door is made out of wood and only you know where it’s located.
In my country mandatory military service, aka conscription, is used to take away men’s freedoms, you can’t travel, you can’t work, you can’t participate in politics, you can’t go to hotels… Etc… And it’s all necessary for thé but not for me, meaning the generals and the minister’s children don’t go to the military unstead they go to a business school and start companies all over the world, with people’s money… of course