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WeChat is a popular instant messaging application on Android, iPhone and BlackBerry smart phones, whose chat messages are all stored in local installation folder. This paper studied the data forensic techniques of WeChat messages including the identification of storage location, storage structure and information extraction methods. Since the text message is stored in encrypted SQLite database, we...
Cryptographic algorithm plays a significant role in a cryptosystem, which protects those sensitive and private data from been obtained by some malicious attackers. Actually, the details about the cryptographic algorithm applied in a cryptosystem are often unknown to one cryptanalyst. When a cryptanalyst works on cryptanalysis, he will have much trouble if he doesn't know anything about the used cryptographic...
In this paper, we analyze the password security of two popular network forums under the circumstances of both server and cookie encryption. Firstly, we investigate the inner encryption principles for user's password in each forum including cryptographic algorithms, key derivation ways and encrypted storage. Besides, we evaluate and compare the password security level according to password recovery...
Mobile QQ is the smartphone version of the most popular IM software QQ in China. This paper studies the encipher system and communication protocol of mobile QQ and analyzes its security flaws. We found some security risks of mobile QQ and some of which are fatal especially in a weak wireless environment: Any attacker who could access the communication channel could easily recover the encrypted message...
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