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HMAC is a message authentication code that uses a cryptographic hash function such as SHA-256.
The HMAC Generator is a free tool that lets you instantly generate an HMAC from a string with a secret key and compare it against the original to check for integrity.
The HMAC process combines a secret key with message data, hashes the result, combines the hash value with the secret key again, and applies the hash function once more. The output hash is 256 bits in length.
A hash-based message authentication code (HMAC) generator computes a fixed-size digest of some input data, producing a unique representation of that data. The resulting hash can be used to verify the integrity and authenticity of the input data.
As the slightest interruption in data will result in a completely different hash output, HMAC allows developers to detect that level of tampering with the input data, if there is any.
The output data's authenticity can be verified as a secret key generates the HMAC. This ensures HMAC is a helpful tool for generating authentic output data.
LambdaTest's free-to-use HMAC generator takes two inputs: the message (or input data) and a secret key. With the help of a cryptographic hash function (such as SHA-256 or SHA-3) to the input data and key, the resulting hash is generated. The key ensures that only someone with the key can compute the correct HMAC for a given message, making the HMAC helpful for message authentication and integrity verification.
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