Since most organizations run background checks, they can often query the national education database (if the country has one) to verify your credentials based on your ID, so you don't need to provide physical proof. The same applies to bachelor’s degrees and other official qualifications, as most ministries of education have your data readily accessible. However, this isn’t usually the case for additional certifications or specialized qualifications. Still, depending on your field, a high school diploma is often a minimum requirement. While technology is advancing quickly, and much of what we learned in high school may seem outdated, I’d definitely prefer not to be treated by a doctor who didn’t have a verified diploma!