KeyLemon
is a company from Switzerland specialized in face
recognition and speaker
recognition. This review is on their face recognition software also
called KeyLemon.
A few years back we reviewed and fooled KeyLemon version 2.3.1, now let's see how this biometric software has evolved.
A few years back we reviewed and fooled KeyLemon version 2.3.1, now let's see how this biometric software has evolved.
KeyLemon replaces the standard MS
Windows logon and session lock-out with a face recognition dialog using a standard
webcam. Version 3.1.1. also includes the option to use speaker recognition.
For this article we tested KeyLemon
version 3.1.1 gold edition on MS Windows 7 Home Edition, using a Logitech C500
webcam (1.3 megapixels).
Differences
in between license versions
In the basic "free"
version you can only use the standard face recognition feature to logon
and unlock your computer. In the bronze version functionality is added
so your computer automatically locks when you are no longer in front of the
screen.
The gold version adds features of which the most important are adapting face models under different lighting conditions and setting level of security / ease of access.
The gold version adds features of which the most important are adapting face models under different lighting conditions and setting level of security / ease of access.
Installation
Installation of KeyLemon is easy:
download the executable file from the supplier
website, execute it and after running the installer you are ready to
enroll and start using this application.
Overview
of functionalities
The KeyLemon Control Center is clear
regarding the different configuration options and functionalities which can be
enabled. Instructions provided on the interface are sufficient to get you
started quickly.
Creating a new face model (enroll) in KeyLemon.
Highlights
- LemonLogin makes that you can login or unlock the system using face recognition, alternatively the dialog presented by KeyLemon still allows you to enter a password for login.
- LemonLock locks the session after a configurable period of inactivity, if it detects that you are no longer sitting in front of the computer.
- In the gold edition you can store multiple face models allowing face recognition in different lighting conditions. Without this option KeyLemon might have difficulty performing face recognition at night when your face model was created during the day time, or vice versa.
- In the gold edition you can configure the recognition accuracy(low - medium - high), a higher setting means it will be more difficult to fool the software but could also make it more difficult to perform valid logons.
- In the gold edition you can activate eye blink detection. During the logon process KeyLemon will ask to blink your eyes, this liveness check will make it more difficult for someone to logon using an image or video.
Configuration options specific for the gold edition.
Does
it work?
Security,
false acceptance rate
For testing security, false
acceptance rate, I chose the following setup:
- recognition accuracy set to high
- eye blink detection activated and requiring 1 blinks
I succeeded very quickly to fool
KeyLemon. With only a picture of the subject, a bit of editing in Microsoft
Paint and a smartphone I completed this hack of KeyLemon. See for yourself in
the video below.
General
useability, false rejection rate
For the purpose of this review I
have created 7 face models in KeyLemon at different light conditions. The
computer I used for the tests is installed close to a window on the south side,
so light conditions vary a lot.
To test the false
rejection rate, I chose a maxed out setup:
- recognition accuracy set to high
- eye blink detection activated and requiring 3 blinks
- limit the time for login to 10 seconds
During my first test with this
setup, the logon screen of KeyLemon crashed. After a reboot, the
logon using 3 blinks of both eyes worked fine. Later on I had one similar crash
in which the KeyLemon logon screen just froze and I had to logon using my
password.
With the exception of the two
crashes I had little difficulty logging on to my computer.
A disadvantage of the software is
that you can have no separate configuration settings for individual
users. Any user can change the security settings of KeyLemon and this will
affect all user accounts using the software. My 7 year old son changed the
number of eye blinks to '1' on his own account, this also affected the logon
process of my own account. Source
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