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You are able to upload an encrypted ramdisk and grab the decryption keys for it. However, once you have access to the AES engine, the entire system falls apart. This makes usage of the key nearly impossible. To complicate things even more, the engine is only accessible through a special bootrom or iBoot exploit ( jailbreaks typically expose it with /dev/aes_0). The GID key is currently unretrievable and can only be utilized through the built-in AES engine. 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.
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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. The discovery of the 0x837 key led to the ability to decrypt any 1.x firmware.įollowing IMG2 came the IMG3 file format. 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. Over time Apple changed the way they encrypt firmware files, hence the way to decrypt them and get decryption keys changed as well. Apple uses encryption to make it harder to analyze and modify them. Firmware Keys are keys which decrypt bootloaders, ramdisks, and root filesystem of iOS firmware, if those components are encrypted.