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近年来随着手机智能化程度的不断提高,手机在人们日常生活中所起到的作用愈加凸显。在侦查人员办理与智能手机相关的违法犯罪案件中,通常会发现手机中存储了大量有价值的用户信息,其中包括与犯罪相关的通话记录、图像、音频、视频等信息。智能手机中存储的各种类型音频文件已经成为一种普遍存在的信息,因此在手机取证工作中如何将种类繁多的音频信息提取并恢复已经成为手机取证领域研究的热点内容。本文通过在Android智能手机中音频文件取证技术的研究,提出一种解决方案,该方案能成功恢复并通过转码的方式正常播放已被删除的音频数据。与传统手机取证方法相比,此方案能够在不影响信息提取精确度的前提下提高智能手机中被删除音频数据的恢复效率。
In recent years, with the continuous improvement of the degree of intelligent mobile phones, mobile phones play a more prominent role in people’s daily life. Investigators handling smart phones related to criminal cases, usually found in mobile phones stored a lot of valuable user information, including crime-related call records, images, audio, video and other information. The various types of audio files stored in smartphones have become ubiquitous information. Therefore, how to extract and recover a wide variety of audio information in mobile phone forensics has become a hot topic in the field of mobile forensics. This paper presents a solution to the forensic technology of audio files in Android smartphone, which can successfully recover and play the deleted audio data through transcoding. Compared with traditional mobile forensics, this solution can improve the recovery efficiency of deleted audio data in smartphones without affecting the accuracy of information extraction.