Electronic version of diploma in the US universities?
Some U.S. universities do release electronic copies of transcripts. They treat these as completely official document, and the documents are supposed to contain additional security features, which the recipient can verify. 

For example, there is an information page about electronic transcripts from the University of Michigan. 

However, if you are concerned about the electronic copy, you could just ask for a paper copy. It is not in any way unusual in the U.S. to ask applicants to have their university send official paper transcripts by mail directly to the potential employer. The applicant will pay the university a small fee to do this, of course, so many employers only request the official transcripts at later stages of the hiring process, and accept informal copies for the initial stages.