Why do some companies ask last 4 digits of my SSN or a scan of my ID? What are my risks?

Yesterday I found out that some major service provider (online rentals) that I use now requires proof of my identity if I want to continue and make a booking. I was offered 2 options:

Enter last 4 digits of my social secu… Continue reading Why do some companies ask last 4 digits of my SSN or a scan of my ID? What are my risks?