August 2017
Intermediate to advanced
336 pages
11h 39m
English
Content preview from System Forensics, Investigation, and Response, 3rd Edition
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JTAG
It is often the case that a phone is locked and you cannot bypass the login screen. For many phones, JTAG is the answer. JTAG, or Joint Test Action Group, is an Institute of Electrical and Electronics Engineers (IEEE) standard for testing chips. Test access points (TAPs) are used to directly access the chip and extract data. This was designed for a wide range of chips and works well on many phones. Android phones often have the TAP order published. Technically one can JTAG an iPhone, but finding the TAPs is a challenge because they are not published.
IEEE 1149.1 defines these connector pins:
TDI (Test Data In)
TDO (Test Data Out)
TCK (Test Clock)
TMS (Test Mode Select)
TRST (Test Reset), optional
Basically, the forensic examiner takes ...
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