Keccak算法被NIST选为新一代哈希函数标准（SHA-3），目前已应用于公共区块链平台以太坊中，未来将有更广泛的应用场景。本项目将针对化简轮数Keccak算法的原像攻击、碰撞攻击和带秘钥模式下的秘钥恢复攻击展开研究，深入挖掘Keccak算法的结构特点和性质，研究新型攻击方法。并结合非线性代数技术、GPU技术等多种技术提升实际攻击能力，给出行之有效的实际攻击方法，进而通过实际攻击揭示算法本身的特点和规律，对更高轮数的正式版本算法实例安全性分析提供借鉴和理论支撑。本项目将推动Keccak算法的分析研究，具有重要的理论和实际意义。

Keccak is released as the third Secure Hash Algorithm (SHA-3) by NIST and is applied in Ethereum, which is a global platform for blockchain. In the future, Keccak(SHA-3) will surely be broadly used. The project will study on three main attacks on Keccak, i.e. preimage attacks, collision attacks and key-recovery attacks, including studing the detailed algebraic structures and characters and proposing the new attacks. To improve the practical attacks, the project will combine the nonlinear algebraic and GPU techniques to make practical attacks more effective. These practical attacks will help us to find more features and provide references for security analysis of official Keccak instances. This project will promote the studies on Keccak, which has important theoretical and realistic meaning.