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Poseidon is a cryptographic primitive that combines elements of hash functions and permutation-based cryptography. It employs a specific construction to achieve properties like collision resistance and data integrity. Poseidon is often used in the context of zero-knowledge proofs, where it enables efficient and secure computation. Its design emphasizes efficient and parallelizable operations, making it suitable for resource-constrained environments. Poseidon has been applied in various blockchain and cryptocurrency systems, enhancing privacy and scalability features. Its unique structure and properties make it a notable component in the realm of cryptographic protocols and systems.