Cómo revertir keccak256 en Solidity

Question

Necesito ayuda con el siguiente código en el que se me da el keccak256 de un parámetro y necesito invertirlo para encontrar el parámetro y resolver el desafío contract LessonFive is AFoundryCourseChallenge { error LessonFive__WrongPassword(); bytes32 public constant EXPECTED_BYTES = 0xb68fe43f0d1a0d7aef123722670be50268e15365401c442f8806ef83b612976b; /* CALL THIS FUNCTION! * Use all the help you can on this one! Google, AI, friends, peeranha, ethereum stack exchange, etc. * Hint: Its a very common... * @param password - A string that when you keccak256 it will return the EXPECTED_BYTES! @param yourTwitterHandle - Your twitter handle. Can be a blank string. */ function solveChallenge(string memory password, string memory yourTwitterHandle) external { if (keccak256(abi.encodePacked(password)) == EXPECTED_BYTES) { _updateAndRewardSolver(yourTwitterHandle); } else { revert LessonFive__WrongPassword(); } } } `

0x7a36...df11 · Answer

you cant reverse a keccak256 hash output to find its input. This property is fundamental to how blockchain networks achieve data integrity and security. keccak256 is designed to be a one-way function: its computationally easy to generate a hash from input data, but its computationally infeasible to generate the original input given only the hash output. here you can only brute force out as in a hint. Tipo querty to try to enter. I cant reproduce myself. you see your contract is inherited from the AFoundryCourseChallenge contract. Can you attach the code of this contract, MB there is something interesting)

foufrix · Answer

As the previous message said, its impossible to reverse keccak256 as it will break the security hash. Ive also participated in the lesson you are talking about, and there are two hints there : Hint: Its a very common... => Take a look at what are the most used passwords https://arbiscan.io/address/0xf988Ebf9D801F4D3595592490D7fF029E438deCa is the contract in question. Because we are on the blockchain, you can see everything! Take a look at other peoples transactions ;)

Cómo revertir keccak256 en Solidity

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