Decrypting iPhone Apps

This blog post explains a technique to convert encrypted iPhone application bundles into plaintext for analysis using a jailbroken device and tools like otool, a hex editor, GDB, IDA Pro, and ldid; it outlines Mach-O basics, determining encryption status, dumping decrypted code from memory at runtime, replacing the encrypted section with the dump, and re-signing the modified binary to run on the device.