Whom Are You Chatting With?
نویسندگان
چکیده
Instant messengers (IMs) have become a very popular and convenient tool for communication. Having started with simple presence protocols, IMs now support exchange of text, sound, video, even game playing. Tons of information are being daily exchanged through IMs. Still, it seems that IMs favor functionality over security. Most popular IMs (MSN, Yahoo! messenger, ICQ etc...) send data as plaintext which, as such, can be recovered using a simple sniffing tool. In this study, we investigate security issues in the authentication and message transmission of popular IM protocols. Our investigation is twofold. The first part is evaluating the protocols and the second evaluating the specific implementations of them by popular clients. We also describe sniffing, Man in the Middle and fake server attacks and evaluate the resistance of the protocols against them. We discuss ways to exploit the current vulnerabilities, and give reasons for their birth. Finally we discuss how the current vulnerabilities can be fixed and how future ones can be avoided.
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