One version of PEK is implemented as a third party keyboard for Android and can replace the system keyboard once it is installed. We are the first to design a generic randomized keyboard for the Android system though the idea of randomizing the key layout is not new. PEK shows a normal QWERTY keyboard or a system default one when a user inputs text like an email or a message.
#Pin keypad layout password#
We maintain the usability of PEK through a context aware feature: a randomized keyboard shows up only when a user taps a password or pin. In other words, the user is presented with a randomly shuffled keyboard each time she taps a password. Whenever a user of a touch-enabled device is to type the password, a randomized keyboard is shown to her. With PEK, we shuffle the positions of the characters on the keyboard. It can be observed that these attacks are possible in that the keys of the keyboard are at the fixed position. To defeat the attacks introduced above, we invent a novel context aware privacy enhancing keyboard (PEK) for touch-enabled devices. In sensor-based attacks, with the help of the accelerometer (acceleration) and gyroscope (orientation), a malware senses the slight motion of a device when the user types different keys. The hand movement and the finger position indicate which keys are being touched. In computer vision-based attacks, the interaction between the hand and the keyboard is exploited. For example, in residue-based attacks, the tapped keys can be inferred from the oily or heat residues left on the touch screen, the order of which can also be determined by measuring the heat residue left on the touched positions. Sensitive information like the passwords entered on mobile devices can be stolen by attackers by exploiting the soft keyboard. The touch-screen enabled devices have been a popular target of network attacks. The observations from the usability testing are educational: (1) convenience plays a critical role when users select an input method (2) people think those attacks that PEK prevents are remote from them. For the purpose of usable security and privacy, we designed a two-stage usability test and performed two rounds of iterative usability testing in 20 summer with continuous improvements of PEK. However, the number of installations has not lived up to our expectation. PEK has been released on the Google Play since 2014. Nevertheless, whenever users enter a password in the input box on his or her touch-enabled device, a keyboard will be shown to them with the positions of the characters shuffled at random. Usually PEK would show a QWERTY keyboard when users input text like an email or a message. To protect users from numerous password inference attacks, we invent a novel context aware privacy enhancing keyboard (PEK) for Android touch-based devices.
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