Grid information as a basic tool for forensic analysis services
ctrlf.net provides its clients with technology to analyze audios and videos on their truth, independent from the metadata contained in
the files themselves. The technology, commonly referred to as ENF, relies on electromagnetic information often contained in recorded media.
We supply our ENF toolset to law enforcement, media outlets, insurance companies and law firms.
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Our services bring Electrical Network Frequency = ENF analysis to the next level
Ctrlf.net builds the bridge between state-of-the-art academic sciences and the real-world needs of digital forensic services. We have developed a toolset of statistic-based methods to automatize ENF analysis and speed up the analytical process.
From the audio to the identification of date and time of recording
You have an audio recording.
Our software isolates the grid hum. If content is secret, we provide you a licensed software for you to isolate the grid hum. Then, you provide us the grid hum only.
If possible, we enclose the mains frequency.
Our analysis provides date and time of origin.
From the video to the identification of the period of recording
Video analysis can be more complex than audio analysis due to frame rate.
You have a video recording.
Our software isolates the grid hum. If content is secret, we provide you a licensed software for you to isolate the grid hum. Then, you provide us the grid hum only.
If possible, we enclose the mains frequency.
Our analysis provides date and time of origin.
How we isolate the frequency from a video
- Audio trace comprises different frequency bands
- Grid hum = 50Hz-Band or harmonics are co-recorded
- This is compared to the measured frequency
- Brightest pixels („super pixels“) can be isolated
- These pixels include the grid hum as the change in brightness most distinctively
- They are compared to the measured frequency
Fake Detection
The grid frequency is a unique stamp. Manipulation of recordings leaves back breaks in meta data and/ or background noise.
In our analysis, we consider both: The recording itself and the isolated background frequency bands. The isolated grid hum against the mains frequency.
Geo-localisation of a recording
You need to know where your document has been recorded? Our analysis provides you information about the grid region.
You have a video or audio recording.
Our software isolates the grid hum.
We analyze the mains frequency and choose similar mains frequency recordings.
Our analysis compares the isolated grid hum against the mains frequency recordings to determine the place of origin of your document.
Further services
We are open to adapt our services to your needs, e.g.:
Ctrlf.net supports geo-localization of audios and videos.
Our engineers help you in realtime origin verification of video calls.
Ctrlf.net is able to provide testimonial with bijective external certification stamp in realtime or ex post. Ctrlf.net collaborates with the worldwide experts in ENF analysis, both in academia and for practical application.
Our clients
We provide significant added value by saving our clients‘ time and resources:
media companies | law firms | fraud enforcement
Support in realtime analysis of videos and audios
Do you want to learn more about our services?
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