ePassport: Securing International Contacts with Contactless Chips

摘要

Electronic passports (ePassports) have known a wide and fast deployment all around the world since the International Civil Aviation Organization published their specifications in 2004. Based on an integrated circuit, ePassports are significantly more secure than their predecessors. Forging an ePassport is definitely thwarted by the use of cryptographic means. In spite of their undeniable benefit, ePassports have raised questions about personal data protection, since attacks on the basic access control mechanism came into sight. Keys used for that purpose derive from the nothing but predictable machine readable zone data, and so suffer from weak entropy. We provide an in-depth evaluation of the basic access key entropy, and prove that Belgian passport, recipient of Interpol "World's most secure passport" award in 2003, provides the worst basic access key entropy one has ever seen. We also state that two-thirds of Belgian ePassports in circulation do not implement any data protection mechanism. We demonstrate our claims by means of practical attacks. We then provide recommendations to amend the ePassport security, and directions for further work.