PALO ALTO, Calif.—One week ago, Estonia launched its "e-resident" program, allowing non-resident non-citizens to obtain a digital identification card issued by the Estonian government. On Monday ...

Estonia has frozen the digital ID cards for its popular e-residency programme, two months after discovering a major security flaw that could enable identity theft.

Estonian ID cards use open source public key-private key encryption (upgraded in 2011 to 2048-bit RSA), which allows government agencies to perform various secure functions online connected with a ...