The simpler hand design in this one is definitely better. I did have one thought that I wanted to pose, however. Would the fingers being together instead of apart make much of a difference? I can almost see this design being symbolic of a ‘high five’ instead of a ‘halt!’
example:









I’d like to commend your attempt here, and not sound discouraging or anything like that. Personally though, I like the other design a little bit better. Like another commenter suggested, this design seems to evoke security more than privacy. The shield and lock seem to be pretty commonly associated with those other meanings already. The dove being inside the lock definitely seems to overcomplicate things a bit too.
That being said, I do think your coloration and black undertones look better though and overall there’s a bit more visual interest.