I think you should share your salary with as many people as possible. This "don't share" policy is just a trick used by companies to keep labor costs down.
If employees know each other's pay, they will start demanding raises - Then you get in a situation like in the finance sector where companies will be forced to pay big bonuses to hold on to important employees. Companies don't want that - They want their engineers to stay cheap, dependent and foolishly loyal.
It's how the system works; nice people get screwed. In your career, you will only receive the minimum amount that you're willing to accept - It's HR people's job to make sure that you don't get anything more than that.
If employees know each other's pay, they will start demanding raises - Then you get in a situation like in the finance sector where companies will be forced to pay big bonuses to hold on to important employees. Companies don't want that - They want their engineers to stay cheap, dependent and foolishly loyal.
It's how the system works; nice people get screwed. In your career, you will only receive the minimum amount that you're willing to accept - It's HR people's job to make sure that you don't get anything more than that.