![]() ![]() Let's say there's 1 billion files with share URL. How many files are in Dropbox that have share URL? I don't think Dropbox published this data, so I'm going to make a guess. Now this boils down to a math problem: suppose that there are m occupied keys in a key space of 36**11, if an attacker sends n guesses, what is the probability that at least one of the guesses matches an occupied key. Currently, Dropbox share URL is 11 characters that consists of lowercase alphabets and numbers (36 possible characters). I think what you are really asking is, would you be successful? Can you brute force Dropbox URL? Well, yes, you can also brute force AES256 encrypted file.
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