April 2020
Intermediate to advanced
400 pages
10h 12m
English
book
Practical Mobile Forensics - Fourth Edition
by Rohit Tamma, Oleg Skulkin, Heather Mahalik, Satish Bommisetty
Content preview from Practical Mobile Forensics - Fourth Edition
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Normal mode
When an iPhone is switched on, its operating system is booted; this mode is known as normal mode. Most regular activities (calling, texting, and so on) that are performed on an iPhone will be run in normal mode.
When an iPhone is turned on, internally, it goes through a secure boot chain, as shown in the following diagram. This does not occur for jailbroken devices. Each step in the boot-up process contains software components that are cryptographically signed by Apple to ensure integrity:
A secure boot chain of an iPhone in normal mode
*The boot ROM, in turn, verifies whether the Low-Level Bootloader (LLB) is signed by Apple ...