GSM sniffing и hacking № 2
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Researchers replaced the firmware of a simple Motorola GSM phone with their own, which allowed them to retain the raw data received from the cell network, and examine more of the cellphone network space than a single phone ordinarily monitors. Modifying the USB interface, helped them send this data in real time to a computer, which captured every bit of the information. By sniffing the network while sending a target phone an SMS, they were able to determine precisely which random network ID number belonged to the target. This gave them the ability to identify which of the myriad streams of information they wanted to record from the network. After that, the next step is essentially decrypting the information. ITs not that easy, but was made possible by the way operator networks exchange system information with their phones. Truth be told, a new GSM standard was put in place several years ago to turn these buffers into random bytes, they in fact remain largely identical today, under a much older standard. Sticking to older standards enabled hackers to predict with a high degree of probability the plain-text content of these encrypted system messages. Rainbow tables are usually used in all kinds of Brute-force password hacking. Many GSM operators reuse these session keys for several successive communications, allowing a key extracted from a test SMS to be used again to record the next telephone call, minimizing the need for recomputation. The process was demonstrated using their software to sniff the headers being used by a phone, extract and crack a session-encryption key, and then use this to decrypt and record a live GSM call between two phones in no more than a few minutes. Any geek can make such devices and with the help of the open source software, can mimic these hacks. So can we really do something to prevent these kinds of hacks from happening? They could implement the randomization of padding bytes in the system information exchange, making the encryption harder to break. Worst part is, all the current 3G phones are NOT shielded from this hack. Maybe its high time for GSM consortium to wakeup and address these issues, or atleast learn few things from CDMA networks, which are inherently secure. The Video Presentation can be downloaded here: As part of this background communication, GSM networks send out identifying information, as well as 'keepalive' messages and empty spaces are filled with buffered bytes. Hacking , Security , Telecom Tags: December 6, 3: Tarandeep Singh on January 1, GSM Network Sniffer Researchers replaced the firmware of a simple Motorola GSM phone with their own, which allowed them to retain the raw data received from the cell network, and examine more of the cellphone network space than a single phone ordinarily monitors. About Tarandeep Singh Independent software Entrepreneur and software developer at premier Fortune 20 company. Do you need Antivirus on Android? Review October 2, Apple iPhone 8:
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