NXP Semiconductors

MF1P(H)x1y1

MIFARE Plus EV1

MF1P(H)x1y1

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Product short data sheet

Rev. 3.2 — 6 December 2018

COMPANY PUBLIC

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8.3 Proximity check

The Proximity Check is used in conjunction with the Virtual Card Architecture, see

Section 8.2. It can also be used afterwards. It allows the PCD to verify whether the PICC

is within a certain physical proximity.

MF1P(H)x1y1 enables ISO/IEC 7816-4 compliant Proximity Check by supporting

wrapping of the native Proximity Check commands into ISO/IEC 7816-4 compliant

APDUs, as outlined in Section 8.6.3.

The SL3 and SL1 after ISO/IEC 14443-4 activation offers the Proximity Check function

which protect the PICC from relay attacks by measurement of the round trip time of

a challenge-response interaction. If an attacker wants to mount a relay attack, then

he necessarily introduces delays. Depending on how large the delays are, they may

be detected. The accuracy of the time measurement and the residual relay attack

window that remains is dependent on the intrinsic latency of the PICC as well as of the

implementation of the reader.