What you are looking for is called a swaging tool, often referred to by the brand names Locolock or Nicopress in the field. Be aware that the cheaper ones are rated for softer metals and small diameter wire rope.

I have used diagonal pliers to crimp ferrules, but only for non-critical applications. I did it twice for each ferrule. The blunt cutters compress the soft metal deeply around the cable. If I wanted it more security, I might also bash the ferrule with a hand sledge to flatten more of it around the cable. Lastly, there is a screw-operated swaging tool. Slower but probably more powerful than a hand crimper.