![]() The ramdisk keys can only be retrieved with the processor specific GID Key. In terms of the pre-iPhone OS 3 VFDecrypt key, it is stored as plain-text in the "_restore" segment of the ASR image within the ramdisks. ![]() Apple took encryption seriously with IMG3 by utilizing AES (based on the Rinjndael key schedule). In order to maintain their integrity, they use multiple layers of encryption. They were introduced with iPhone OS 2.0 beta 4, and have been in use ever since. Following IMG2 came the IMG3 file format. The discovery of the 0x837 key led to the ability to decrypt any1.x firmware. For the 1.1.x series, they were encrypted with the 0x837 key. They were used on all known iPhone OS 1.x firmwares. With the release of the iPhone came the IMG2 file format.
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