The risks and best practices of using UUIDs for authentication, uncovering vulnerabilities, and secure implementation strategies.
UUID for authentication There is hardly a person nowadays who never clicked that "Recover password" button in deep frustration. Even if it does seem the password was without a doubt correct, the next step of recovering it mostly goes smoothly with visiting a link from an email and entering the new password .
Assuming the same device with a static 48-bit MAC part is responsible for all three generations, it sets a user with a sequence of potential IDs between A and B, where the target UUID is located. Depending on the time proximity between generated IDs to target, the range can be in volumes accessible to brute-force approach: check every possible UUID to find existing ones among empty.
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