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Forensics audio and video
The document emphasizes the importance of documenting and preserving the integrity of audio and video evidence in forensic investigations, highlighting relevant techniques and software. It includes announcements for upcoming events, including a Capture The Flag (CTF) competition and lab hours. Additionally, it provides links for sign-in and applications related to events and resources.
In this document
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Introduction to audio and video forensics. Information about signing in for a CTF problem.
Emphasizes the critical role of documentation in forensics to preserve evidence integrity.
Introduction to forensics and the concept of steganography in digital evidence.
Overview of standards organizations like AES, ABRE, and ANSI related to audio forensics.
Notable software tools used in audio forensics including GIMP, Audacity, and Professional.
Techniques for analyzing audio data such as waveform and spectrographic analysis.
Techniques like sharpening, stabilization, interlacing, and demultiplexing for media enhancement.
Two examples that illustrate forensic analysis and how to solve problems presented.
Discussion of the importance and role of metadata in digital forensic investigations.
Details on upcoming events, CTF timings, and announcements related to forensics discussions.
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Forensics audio and video
- 1. Forensics - Audio andVideo Please sign-in via QR Code or https://goo.gl/U46rfU
- 2.
- 3. Documentation is SUPER important ●We can’t emphasize this enough ● Preserve integrity of evidence ● This stuff may be actual evidence in court cases
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- 5. Standards Audio Engineering SocietyInternational American Board of Recorded Evidence American National Standards Institute
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- 7.
- 8. Audio Demo Found someinteresting words of advice left by sayonara-bye... help me understand it!
- 9.
- 10. Picture/Video Techniques Stabilization -can be included with camera when recording Interlacing Demultiplexing
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- 17. CSAW CTF Sept 133 PM - Sept 15 3 PM Open lab - ECSS 4.619 Sept 13 3 PM - 9 PM Sept 14 10 AM - 4 PM Team code will be in Discord
- 18. Upcoming Events Next week- Files and Filesystems Forensics October 7 - Paycom November 4 - Texas Instruments Confirming - Alkami and Cambrian Cyber Group
- 19. Announcements Fire Talk Signup - bit.ly/2kF7FIk CSG Officer Application - bit.ly/2malxuB
- 20.
Editor's Notes
- #3 Audio analysis and video analysis are two separate disciplines by the American Society of Crime Laboratory Directors, Laboratory Accreditation Board, American National Standards Institue
- #5 Audio analysis and video analysis are two separate disciplines by the American Society of Crime Laboratory Directors, Laboratory Accreditation Board, American National Standards Institute
- #6 IDENTIFICATION: At least 90% of all comparable words must be very similar aurally and spectrally, producing not less than twenty (20) matching words. PROBABLE IDENTIFICATION: At least 80% of the comparable words must be very similar aurally and spectrally, producing not less than fifteen (15) matching words. POSSIBLE IDENTIFICATION: At least 80% of comparable words must be very similar aurally and spectrally, producing not less than ten (10) matching words. INCONCLUSIVE: Falls below either the Possible Identification or Possible Elimination confidence levels and/or the examiner does not believe a meaningful decision is obtainable due to various limiting factors. POSSIBLE ELIMINATION: At least 80% of comparable words must be very dissimilar aurally and spectrally, producing not less than ten (10) words that do not match. PROBABLE ELIMINATION: At least 80% of the comparable words must be dissimilar aurally and spectrally, producing not less than fifteen (15) words that do not match. ELIMINATION: At least 90% of the comparable words must be very dissimilar aurally and spectrally, producing not less than twenty (20) words that do not match.
- #7 Glimpse - GIMP fork
- #8 Waveform Analysis: The waveform display reflects graphically the relationship between the time and amplitude of recorded sounds and allows the identification and comparison of record events on evidence and test tapes. When a record event occurs such as a start, stop, stop/re-start or pause on a magnetic analog tape, a distinctive mark or signature is placed on the tape. When waveform analysis is conducted, these signatures can be seen and in most cases, heard. Digital recorders also produce small signatures which can be seen on the waveform. Spectrographic Analysis: A sound spectrograph displays the recorded material in time, frequency, and amplitude. Its distinctive display is used to further study the effects of record events, etc. Any gap in the audio signal as well as signatures can be examined on the spectrograph.
- #9 Hint: Why does that right channel sound strange?
- #10 Sharpening Masking Deblurring - Wiener filter
- #11 Interlacing - In an analog system, interlaced scanning is used to record images (a technique of combining two television fields in order to produce a full frame of video). A process called de-interlacing may be used to retrieve the information in both fields of video. odd/even lines Demultiplexing - Allows for isolation of each camera. In CCTV systems, a device called a multiplexer is used to combine multiple video signals into a single signal or separate a combined signal. These devices are frequently used in security and law enforcement applications for recording and/or displaying multiple camera images simultaneously or in succession.
- #12 From ICE 2018
- #21 https://utdallas.qualtrics.com/jfe/form/SV_eQjGgy01OJVqkL3