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ETH The Ethereum Foundation adjusts its quantum security plan to abandon the Poseidon algorithm
The Ethereum Foundation announced a strategic adjustment to its subsequent quantum cryptography roadmap and decided to abandon the use of the Poseidon hash function in favor of a more robust alternative to protect the network from future quantum threats.
Why the Ethereum Foundation is reconsidering Poseidon
Poseidon is a zero-knowledge proof-friendly hash function that was previously a core part of the Ethereum cryptography project, especially favored for its efficiency in zk-SNARKs and zk-rolls. However, recent advances in the field of cryptanalysis have raised concerns about its long-term security margins. According to a technical update released in March 2025, the foundation's decision reflects its proactive attitude in responding to potential vulnerabilities and aims to resolve problems before they become serious.
This impact on Ethereum security and scalability
Discontinuing Poseidon will likely affect the design of future Ethereum upgrades, including those related to account abstraction and second-layer solutions. Although this shift may entail short-term development costs, it is a necessary step to ensure that networks remain secure in the post-quantum era. The foundation is evaluating a variety of alternative hash functions that combine post-quantum resistance with the performance required by Ethereum's high-throughput ecosystem.
Impact on Developers and Users
For developers, this means adjusting existing zero-knowledge circuits and smart contracts that rely on Poseidon. The foundation has committed to providing migration tools and documentation to simplify the transition process. For ordinary users, this change should be insensitive, but it reminds us of the importance of Ethereum's evolving security landscape.
Conclusion
The Ethereum Foundation's abandonment of Poseidon is a deliberate move to strengthen cybersecurity for the future. By addressing potential cryptographic weaknesses early, Ethereum aims to continue to maintain its position as a leading smart contract platform when the era of quantum computing comes. As the transition progresses, stakeholders should pay attention to official updates for technical details and timetables.
FAQ
Q1: What is the Poseidon hash function?
Poseidon is a cryptographic hash function optimized for zero-knowledge proofs and is efficient in zk-SNARKs and zk-rolls. It was once seen as a key component of Ethereum's future scalability plans.
Q2: Why did the Ethereum Foundation abandon Poseidon?
Recent cryptanalysis research has uncovered potential security weaknesses in Poseidon's design, prompting the foundation to seek more robust post-quantum alternatives to ensure long-term security of the network.
Q3: How will this change affect Ethereum users?
For end users, this transition is expected to be largely unresponsive, but developers may need to update zero-knowledge circuits. The foundation is providing tools and documentation to support smooth migration.
