Biblio

Most programming languages support foreign language interoperation that allows developers to integrate multiple modules implemented in different languages into a single multilingual program. While utilizing various features from multiple languages expands expressivity, differences in language semantics require developers to understand the semantics of multiple languages and their inter-operation. Because current compilers do not support compile-time checking for interoperation, they do not help developers avoid in-teroperation bugs. Similarly, active research on static analysis and bug detection has been focusing on programs written in a single language. In this paper, we propose a novel approach to analyze multilingual programs statically. Unlike existing approaches that extend a static analyzer for a host language to support analysis of foreign function calls, our approach extracts semantic summaries from programs written in guest languages using a modular analysis technique, and performs a whole-program analysis with the extracted semantic summaries. To show practicality of our approach, we design and implement a static analyzer for multilingual programs, which analyzes JNI interoperation between Java and C. Our empirical evaluation shows that the analyzer is scalable in that it can construct call graphs for large programs that use JNI interoperation, and useful in that it found 74 genuine interoperation bugs in real-world Android JNI applications.

Theft or loss of a mobile device could be an information security risk as it can result in loss of con fidential personal data. Traditional cryptographic algorithms are not suitable for resource constrained and handheld devices. In this paper, we have developed an efficient and user friendly tool called “NCRYPT” on Android platform. “NCRYPT” application is used to secure the data at rest on Android thus making it inaccessible to unauthorized users. It is based on lightweight encryption scheme i.e. Hummingbird-2. The application provides secure storage by making use of password based authentication so that an adversary cannot access the confidential data stored on the mobile device. The cryptographic key is derived through the password based key generation method PBKDF2 from the standard SUN JCE cryptographic provider. Various tools for encryption are available in the market which are based on AES or DES encryption schemes. Ihe reported tool is based on Hummingbird-2 and is faster than most of the other existing schemes. It is also resistant to most of attacks applicable to Block and Stream Ciphers. Hummingbird-2 has been coded in C language and embedded in Android platform with the help of JNI (Java Native Interface) for faster execution. This application provides choice for en crypting the entire data on SD card or selective files on the smart phone and protect p ersonal or confidential information available in such devices.