Abstract-Smartphones, whose market share has increased by 54% between 2009 and 2010, is one of the favored platform for "Convergence Computing". Convergence Computing is a technology in which a single device can provide various services without any restrictions from external devices or networks. Today, smartphones as convergent single device have diverse functions and features such as calling, Internet surfing, game playing, banking, storage of personal and professional data, etc. Some of these use encryption algorithms such as AES (Advanced Encryption Standard). For example, this algorithm is used to authenticate server protocols or to encrypt confidential information. This paper shows that an Electromagnetic Analysis (EMA) on AES is possible on a Java mobile phone to extract secret keys. The latter can then be used for forensic purposes or to recover encrypted data stored in the device. Experiments involving two successful approaches are described and compared : Spectral Density based Approach (SDA) and Template based Resynchronisation Approach (TRA).

No abstract

Smartphones have a complex hardware and software architecture. Having access to their full memory space can help solve judicial investigations. We propose a new privilege escalation technique in order to access hidden contents and execute sensitive operations. While classical forensic tools mostly exploit software vulnerabilities, it is based on a hardware security evaluation technique. Electromagnetic fault injection is such a technique usually used for microcontrollers or FPGA security characterization. A security function running at 1.2 GHz on a 64-bit SoC with a Linux-based OS was successfully attacked. The Linux authentication module uses this function to verify the password correctness by comparing two hash values. Hence, this work constitutes a step towards smartphones privilege escalation through electromagnetic fault injection. This approach is interesting for addressing forensic issues on smartphones.

No abstract