The 11-step protocol consists of evidence marking, physical inspection, digital data imaging and playback optimization, critical listening, high-resolution waveform analysis, narrow-band spectrum analysis, spectrographic analysis, digital data analysis, miscellaneous techniques, work notes, and reporting. Sections are included on examination requests, laboratory space, contributor-supplied materials, equipment and software, an 11-step authenticity examination protocol, authenticity examples, evidence handling, and expert testimony. These examinations are conducted to determine whether the recorded information is original, contains alterations, has discontinuities due to recorder stops and starts, and matches a submitted recording system, if available. Experimental results on all these brands are also presented.Ī detailed methodology is described to authenticate investigative and other forensic audio recordings collected via digital recording systems. The popular smartphones brands analyzed in this paper include iPhone 5, iPhone 6, Blackberry Z10, Samsung Galaxy Note 3, Nokia Lumia 930, and Lenovo A536.

This paper focuses on the analysis of multimedia files created on the most popular smartphones in order to ascertain the source and examine whether the files are original or edited through these devices. Therefore, it is crucial for forensic examiners to have the capability of recovering, analyzing, and authenticating the source of multimedia contents stored on these devices. The use of smartphones for this purpose makes these mobile phones rich sources of evidence. A significant number of cybercrimes pertain to illicit possession, modification, and distribution of multimedia files.

With the emergence of smartphones and the widespread use of social media services, distribution of multimedia files over the Internet, and using mobile phones, has increased exponentially over the past few years.

Compress sound file in goldwave