How exactly is the token formed?
sobes.tech AI
Answer from AI
A token is usually a string used for authenticating or authorizing a user or system. The formation of a token depends on its type and purpose, but the general process includes several steps:
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Data collection: The token includes information (payload), such as user ID, creation time, expiration time, access rights.
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Encoding: The data is encoded into a convenient format, often JSON.
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Signing or encryption: To protect the token from forgery, the data is signed with a secret key or encrypted.
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Forming the final string: For example, in JWT (JSON Web Token), the token consists of three parts — header, payload, and signature, each encoded in base64 and separated by dots.
An example of a simplified JWT token:
HEADER: {"alg":"HS256","typ":"JWT"}
PAYLOAD: {"sub":"1234567890","name":"Ivan","iat":1516239022}
SIGNATURE: HMACSHA256(base64UrlEncode(header) + "." + base64UrlEncode(payload), secret)
Final token:
eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IuKAnOKAnCIsImlhdCI6MTUxNjIzOTAyMn0.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c
Thus, the token is formed from data that identifies the user and their rights, and is protected from forgery using cryptography.