In the recent past, smart speakers and personal assistants like Alexa have been used as evidence in different criminal cases. With more than 6 million Echo devices in 2019 worldwide, there is a good chance for the constantly active devices to record criminal behavior. That is reason enough to take a closer look at the subject. This article discusses different starting points for a forensic investigation of the latest generation of the Echo Dot smart speaker. Therefore, the paper examines three possible aspects for the forensic analysis of the Echo 3 the latest generation of this device. In hardware analysis, the focus is not only on the general examination of the extracted data but also on validating the existing methods for data extraction. A second focus is the cloud-side analysis. Since this type of analysis requires the knowledge of credential data, a client-side analysis will take place too. The last is done because the use of at least one Companion Client is necessary to operate and control Alexa-capable devices. The main findings of this study are presented in this article.

Amazon Echo 3, digital forensics, hardware analysis, IoT, IPA

[1] L. French, “Virtual Case Notes: Not Only Can Alexa Eavesdrop - She Can Also Testify Against You“, Forensic Magazine, May 10, pp.1-3, 2019.
[2] S. Yadav, S. Srivastava, M. Singhal, “Smart Home Automation Using Voice Recognition”, International Journal of Computer Sciences and Engineering (IJCSE), Vol.7, Issue.2, pp.560-563, 2019.
[3] P. Naik, N. Telkar, A. Patil, ”Smart Home Automation Technique using IoT” , International Journal of Scientific Research in Computer Science, Engineering and Information Technology (IJSRCSEIT), Vol.2, Issue.3, pp.2456-3307, 2017.
[4] M. Chung, H. Iorga, J. Voas, “Alexa, can i trust you?” Computer, Vol.50, Issue.9, pp.100-104, 2017.
[5] G. López, L. Quesada, L.A. Guerrero, “Alexa vs. siri vs. cortana vs. google assistant: A comparison of speech-based natural user interfaces”. Springer International, Advances in Human Factors and System Interactions, Advances in Intelligent Systems and Computing Vol. 592, pp.241-250, 2018.
[6] H. Chung, J. Park, S. Lee, “Digital forensic approaches for amazon alexa ecosystem”, In Proceeding of the 17th Annual DFRWS, USA, pp.15-25, 2017.
[7] S. Li, K-K. Choo, W. Qindong, J. William, “IoT Forensics: Amazon Echo as a Use Case”, 2019. doi:10.1109/JIOT.2019.2906946
[8] M. Ford and W. Palmer, “Alexa, are you listening to me? an analysis of alexa voice service network trace”. Vol.23 Issue.1, pp. 67-79, 2019.
[9] B. Copos, K. Levitt, M. Bishop, and J. Rowe, “Is anybody home? inferring activity from smart home network traffic,” in Security and Privacy Workshops (SPW), 2016 IEEE, pp.245–251, 2016.
[10] S. Vasile, D. Oswald, T. Chothia, “Breaking all the things - a systematic survey of firmware extraction techniques for IoT devices”. Smart Card Research and Advanced Applications, Cham, pp.171-185, 2019.
[11] M. Kirmani, M.T. Banday, “Digital Forensics in the Context of the Internet of Things”, 2019. doi: 10.4018/978-1-5225-5742-5.ch011
[12] E. Oriwoh, D. Jazani, G. Epiphaniou, P. Sant, “Internet of things forensics: Challenges and approaches”. In Proceedings of the 9th IEEE Int. Conf. Collaborative Computing: Networking, USA, pp.608-615, 2013.
[13] J.R. Shackleton, “Alexa, amazon assistant or government infor-mant.”, U. Miami Bus. L. Rev., Vol.27, Issue.2, pp.301-227, 2019.
[14] S. Li, K.R. Choo, Q. Sun, W. Buchanan, J. Cao., “IoT forensics: Amazon Echo as a use case.” IEEE Internet of Things, Vol.6, Issue.4, pp.6487-6497, 2019.
[15] A. Nieto, R. Roman, and J. Lopez, “Digital witness: Safeguarding digital evidence by using secure architectures in personal devices,” IEEE Network, Vol.30, Issue.6, pp.34–41, 2016.
[16] Q. Do, B. Martini, K.-K. R. Choo, “Cyber-physical systems information gathering: A smart home case study,” Computer Networks, Vol.138, pp.1–12, 2018.
[17] N.-A. Goudbeek, R.C. Kim-Kwang, “A forensic investigation framework for smart home environment,” in In Proceedings of 17th IEEE International Conference on Trust, Security and Privacy in Computing and Communications (TrustCom 2018). IEEE, , p. 1, 2018.
[18] D. Mishra, “Internet of Everything Advancement Study in Data Science and Knowledge Analytic Streams”: International Journal of Scientific Computer Science and Engineering Vol.6, Issue.1, pp.30-36, 2018.