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PassGo, replaces password on touch screen

download the latest      some text2D PassGo      or     some text3D PassGo      or     some text4D PassGo


PassGo, is a password scheme in which a user draws lines/dots on a grid as a password. PassGo was designed in 2005 (inspired by the Go game) and is widely believed to be the prototype of Google Pattern Lock. Google Pattern Lock is basically a mini versoin of PassGo. PassGo offers extremely large password space, and hence can provide very high level security. According to the result of the scientific computation, the password space of a 9x9 PassGo is 256 bits, which is astronomical and is far more than enough to protect any mission critical data.

3D PassGo, a major improvement over PassGo, further extends PassGo from 2D to 3D. 3D PassGo is encoded as a sequence of 3D coordinates, and hence the password space is further extended exponentially. In addition, the 3D grid can be dynamically rotated like the earth in space, and can be zoomed in or out to optimize your comfort to enter a password. 3D PassGo includes 2D PassGo: for example, 1x3x3 grid is basically 2D 3x3 grid; 1x1x3 grid is just a line, and 1x1x1 grid is just a dot. Therefore, you can enjoy all the features of 2D PassGo in 3D PassGo.

4D PassGo, further extends 3D PassGo by adding the dimension of "Time": PassGo has to be drawn in the exactly same rhythm (with certain degree of tolerance) as how it was set up to be entered successfully. 4D PassGo is shoulder surfing resistant and hence more secure. As a rhythm is not visible and might be difficult to remember or to reproduce, we provide two methods to facilitate this issue: first, we introduced the "heartbeat": a continuous heart-beating (vibration) while you are touching the screen. You may choose to move or lift your finger right after certain numbers of heartbeats as a memory strategy. Second, we introduced the "rhythmic style", a visual appearance of your rhythm: the thickness of the lines/dots changes with the rhythm. The slower PassGo is drawn, the thicker the line is and the bigger the dot will be; the faster PassGo is drawn, the thinner the line is and the smaller the dot will be. With above methods, we see a success login rate of above 90% in our tests. 4D PassGo is more secure and shoulder surfing resistant.

PassGo Lock Screens, are a series of Android Lock Screen Apps that implement (2D/3D/4D)PassGo as their main password schemes. PassGo Lock Screens, also capable to lock individual Apps, such as facebook or gallery, will provide you with strong security for the data on your mobile devices. The grid size is adjustable from 1x1x1 all the way to 19x19x19, and the color/style/background can be easily customized (in a way of "you see what you get") to your own preference.

How to download - search "passgo" in Google Play or Amazon, then download and install.


              



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FAQ

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* How to draw a dot?
Touch an intersection on the grid and then lift the finger.

* How to draw a line?
Touch multiple intersections continuously and then lift the finger.

* How to rotate the grid?
Touch the screen just around the grid or inside the grid without touching any intersections, and then keep moving on the screen.

* How to zoom in or out the grid?
Place two fingers on the grid and then adjust the distance between the two fingers.

* How to move the grid?
Touch the screen without touching any intersections, hold for one second, (there will be a vibration and the grid will become dashed) and then the grid will start to move with the finger; in addition when finish zooming, you can also hold one finger for one second after lifting the other finger, and the grid will also move along the finger. (Note, moving grid only works on grid size smaller than 9x9x9)

* Do I have to draw PassGo in exactly the same way as how I set up?
Yes. PassGo requires to be drawn in EXACTLY the same way as how it is set up. For example, if you click an intersection twice when you set up PassGo, then you must click the same intersection twice when you login, even though you only see one dot on the grid (the other dot is overlapped in this case).

* What is the "Lock Screen Timeout"?
"Lock Screen Timeout" is the wait time between screen is off and screen is actually locked. For example, if "Immediately" is chosen, then the screen will be locked instantly after it is turned off (due to either display timeout or power key is pressed); if "Two Minutes" is chosen, then screen will be locked two minutes after screen is off.

* Screen does not lock, what is wrong?
Usually this is due to the setting of Lock Screen Timeout or the Lock Screen Service is not running. Try to turn on the Lock Screen Service. If the problem still exists, feel free to send an email to our support team passgosz@gmail.com.

* Why should I disable System Lock?
Disabling System Lock will avoid double locking. This is optional though.

* Why should I enable "Device Administrator"?
Enabling "Device Administrator" can lower the chance that this app is being maliciously uninstalled, and therefore can provide a higher level of security. This is optional.

* Why should I grant the "Usage Data Access" permission for PassGo in the settings on Android 5.0+?
On Android version of lollipop and marshmallow, granting the "Usage Data Access" will enable PassGo to lock screen more stably.




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