What Is a "Hash Collision" and Why Is It a Concern for Cryptographic Algorithms? ▴ Learn

What Is a “Hash Collision” and Why Is It a Concern for Cryptographic Algorithms?

A hash collision occurs when two different input data sets produce the exact same output hash value. For a secure cryptographic hash function like SHA-256, finding a collision should be computationally infeasible.

If collisions were easy to find, an attacker could replace a valid transaction with a fraudulent one that generates the same block hash, undermining the security of the blockchain.

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