![]() Collective encryption of BIOS and NAND would be the obvious fallback but we know that's not the case. ![]() The most secure way would be collectively encrypt the BIOS, NAND and HDD according to a unique device key but that would preclude user upgradable HDDs. It would have made sense for Sony to use any unique device key to encrypt the contents of NAND in this way but we know it didn't because of the Brazil exploit. Thereby there is no reference cipher block to aid analysis. used to encrypt unique data like user data that will be different from device to device. Unique keys are best employed when they can not be compromised in this way, i.e. Using tens of millions of unique keys (one per PS4) to encrypt identical data provides a metric shit tonne of cipher blocks to analyse and improve the decryption algorithm. Click to expand.You've not really said why you think this but it's a view I've encountered a lot over the years and is counterintuitive or rather, endemic of dated thinking that encrypting everything is better.
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