First Flight #2: Puppy Raffle

Summary

Insecure way of random number generation using keccak256 in a Solidity smart contract leads to predictable guessing, potentially compromising fairness and security.

Vulnerability Details

The use of keccak256(abi.encodePacked(msg.sender, block.timestamp, block.difficulty)) for random number generation in a Solidity smart contract can result in a significant security vulnerability. Miners can manipulate block.timestamp, enabling them to influence generated numbers and allowing for predictable guessing. This flaw threatens the contract's fairness and exposes it to potential exploitation.

Impact

This vulnerability can lead to unfair outcomes in the smart contract's operations,as malicious users may predict and exploit the generated random numbers. It undermines the contract's integrity and may result in financial losses for participants. Migrating to a more secure random number generation method is crucial to mitigate this impact.

Tools Used

Vs code

Recommendations

Use chainlinks vrf to generate random number.