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Your example describes a preimage attack on SHA-1, not a collision attack. Even with a working collision attack you are probably still far away from taking "some.other.input" and creating a sha1("some.other.input") = sha1("johndoe:creditcard").

For instance MD5 collisions are really easy to create but for preimage attacks on MD5 there is still no better approach than just doing brute force.




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