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What Is id_token
What is id_token used in OpenID Connect protocol?
✍: FYIcenter.com
"id_token" is Base64URL encoded string returned from the authentication service provider after the user successfully finishes the authentication process.
"id_token" follows the "RFC 7519 - JWT (JSON Web Token)" to encode authentication information. You should use the following logic to decode the "id_token" value:
Here is example of an id_token string:
eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9. eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ. SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c
After splitting and Base64URL decoding, we have:
Header = { "alg": "HS256", "typ": "JWT" } Body = { "sub": "1234567890", "name": "John Doe", "iat": 1516239022 } Signature = 0x 49f94ac7044948c78a285d904f87f0a4c7897f7e8f3a4eb2255fda750b2cc397
The "Body" component in an id_token is also called "Payload", or "Claim" of an authentication.
By the way, Base64URL encoding is same as Base64 encoding except for 2 encoding characters: "_" is used instead of "/", and "-" is used instead of "+". This is to make the encoded string URL safe.
⇒ What Is the Authentication Claim in id_token
⇐ OpenID Connect Authorization Code Flow
2022-05-31, 1158🔥, 0💬
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