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I will be signing a token with SHA256 and I am wondering on the length of the secret I should put. Does having a secret key length over 256 bits have any benefits if I am using sha256. So if my key is 300 bits long is this more secure?
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The minimum secret length for HMAC: A key of the same size as the hash output (for instance, 256 bits for “HS256”) or larger MUST be used with this algorithm. The minimum key length for RSA: A key of size 2048 bits or larger MUST be used with these algorithms.
The minimum length for an SHA-256 HMAC key is 32 bytes. A key longer than 32 bytes does not significantly increase the function strength unless the randomness of the key is considered weak. A key longer than 64 bytes will be hashed before it is used.
JWTs can be signed using a secret (with the HMAC algorithm) or a public/private key pair using RSA or ECDSA.
First, enter the plain-text and the cryptographic key to generate the code. Then, you can use select the hash function you want to apply for hashing. The default is SHA-256. Then you can submit your request by clicking on the compute hash button to generate the HMAC authentication code for you.
The length of the key has to be <= 512 bits because that is the size of the pads. If someone is trying to brute force your key, having a key size of 512 bits will be the most secure.
So to answer your question. Yes, having a key length 300 bits is more secure than one with length 256 bits.
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