By comparing a subset of the photons that Alice sends with what Bob measures, the pair can check for the presence of errors introduced by Eve.

ECONOMIST: Secure cryptography is only as safe as its weakest link

The CFPB recommends that consumers check their credit reports for accuracy and dispute any errors that could drag their score down.

FORBES: Credit Scores Often Unreliable, Warns Consumer Financial Protection Bureau

The exams watchdog Ofqual has ordered exams bodies to double check their papers after a series of errors by three other boards.

BBC: exam pic generic