SHA (Secure Hash Algorithm) is a family of cryptographic hash functions. These functions are designed to produce a fixed-size "hash" or "message digest" from arbitrary-sized input data. SHA algorithms are commonly used for verifying data integrity, digital signatures, password storage, and other security applications. Common SHA variants include SHA-1, SHA-256, SHA-384, and SHA-512. They are one-way functions, meaning it's computationally infeasible to reverse the hash to find the original input data.
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