IFTT-PIN is a self-calibrating version of the PIN-entry method introduced in
Roth et al. (2004) [1]. In [1], digits are split into two sets and assigned a
color respectively. To communicate their digit, users press the button with the
same color that is assigned to their digit, which can thus be identified by
elimination after a few iterations. IFTT-PIN uses the same principle but does
not pre-assign colors to each button. Instead, users are free to choose which
button to use for each color. The button-to-color mapping only exists in the
user's mind and is never directly communicated to the interface. In other
words, IFTT-PIN infers both the user's PIN and their preferred button-to-color
mapping at the same time, a process called self-calibration. In this paper, we
present online interactive demonstrations of IFTT-PIN with and without
self-calibration and introduce the key concepts and assumptions making
self-calibration possible. IFTT-PIN can be tested at
this https URL with a video introduction available at
this https URL. We review related work in the field of
brain-computer interface and further propose self-calibration as a novel
approach to protect users against shoulder surfing attacks. Finally, we
introduce a vault cracking challenge as a test of usability and security that
was informally tested at our institute. With IFTT-PIN, we wish to demonstrate a
new interactive experience where users can decide actively and on-the-fly how
to use an interface. The self-calibration paradigm might lead to novel
opportunities for interaction in other applications or domains. We hope this
work will inspire the community to invent them.

本文介绍了一种名为 IFTT-PIN 的自校准 PIN 输入方法，它可以自行确定用户选择的按钮 - 颜色映射关系以及用户的密码，从而提高用户的安全性和互动性，并在其它应用领域也可能带来新的交互机会。同时，该方法被提出作为一种新型的应对肩窥攻击的方法。

IFTT-PIN: 利用自校准范式的 PIN 输入方法

IFTT-PIN: A PIN-Entry Method Leveraging the Self-Calibration Paradigm

We demonstrate IFTT-PIN, a self-calibrating version of the PIN-entry method
introduced in Roth et al. (2004) [1]. In [1], digits are split into two sets
and assigned a color respectively. To communicate their digit, users press the
button with the same color that is assigned to their digit, which can be
identified by elimination after a few iterations. IFTT-PIN uses the same
principle but does not pre-assign colors to each button. Instead, users are
free to choose which button to use for each color. IFTT-PIN infers both the
user's PIN and their preferred button-to-color mapping at the same time, a
process called self-calibration. Different versions of IFTT-PIN can be tested
at this https URL and a video introduction at
this https URL.

介绍了 IFTT-PIN，这是一种自校准的 PIN 码输入方法，可以同时推断出用户的 PIN 码和偏好按钮与颜色的映射关系，消除了预先分配颜色的需求。