what is jwt token authentication | attacking jwt for beginners

what is #jwt - JSON Web Token. JSON Web Token (JWT) is a compact URL-safe means of representing claims to be transferred between two parties.

How is JWT token generated?
How is a JWT token generated? We set the signing algorithm to be HMAC SHA256 (JWT supports multiple algorithms), then we create a buffer from this JSON-encoded object, and we encode it using base64.

working of jwt.
the server generates a token that certifies the user identity, and sends it to the client.

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[aakashadhikari]

Hii, its for CTF ...but in real world that key can be alphanumeric ri8?