Defending against highly competent reverse engineers is genuinely a hard problem. You can do nearly everything correctly but one small mistake is a foot in the door. There is one blue team guy I came to know that used to work at Barclays Bank back in the day when I was reversing that app. He was unbelievably good, truly one of if not the best in the world, and caused me a lot of problems. Even still, I found one small mistake and was able to work forward from that and pop the whole thing. Just after they implemented brand new crypto in their app because I broke the old one 😂
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