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Đang xem: Mã Thông Báo Web Json Web Token Là Gì ? Tìm Hiểu Về Json Web Token (Jwt)
All honamphoto.com-issued JWTs have JSON Web Signatures (JWSs), meaning they are signed rather than encrypted. A JWS represents content secured with digital signatures or Message Authentication Codes (MACs) using JSON-based data structures.
A well-formed JWT consists of three concatenated Base64url-encoded strings, separated by dots (.):
JOSE Header: contains metadata about the type of token and the cryptographic algorithms used to secure its contents.
A JWT typically looks like this:
To see for yourself what is inside a JWT, use the JWT.io Debugger. It allows you to quickly check that a JWT is well formed and to manually inspect the values of the various claims.
JSON object containing the parameters describing the cryptographic operations and parameters employed. The JOSE (JSON Object Signing and Encryption) Header is comprised of a set of Header Parameters that typically consist of a name/value pair: the hashing algorithm being used (e.g., HMAC SHA256 or RSA) and the type of the JWT.
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{ “alg”: “HS256”, “typ”: “JWT” }
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JWS payload
The payload contains statements about the entity (typically, the user) and additional entity attributes, which are called claims. In this example, our entity is a user.