In the rest of the article, the term token refers to the JSON Web Tokens (JWT). You can find the Java project here, it uses the official JWT library. The tips presented in this article are part of a Java project that was created to show the correct way to handle creation and validation of JSON Web Tokens. This cheatsheet provides tips to prevent common security issues when using JSON Web Tokens (JWT) with Java. HMACSHA256 ( base64UrlEncode ( header ) + "." + base64UrlEncode ( payload ), KEY ) Objective ¶ Token structure example taken from JWT.IO: It is used by an application to allow a client to present a token representing the user's "identity card" to the server and allow the server to verify the validity and integrity of the token in a secure way, all of this in a stateless and portable approach (portable in the way that client and server technologies can be different including also the transport channel even if HTTP is the most often used). This token is created during authentication (is provided in case of successful authentication) and is verified by the server before any processing. This will prevent an attacker from changing the identity or any characteristics (for example, changing the role from simple user to admin or change the client login). This information is signed by the server in order for it to detect whether it was tampered with after sending it to the client. JSON Web Token is used to carry information related to the identity and characteristics (claims) of a client. JWTs can be signed using a secret (with the HMAC algorithm) or a public/private key pair using RSA. This information can be verified and trusted because it is digitally signed. JSON Web Token (JWT) is an open standard (RFC 7519) that defines a compact and self-contained way for securely transmitting information between parties as a JSON object. Many applications use JSON Web Tokens (JWT) to allow the client to indicate its identity for further exchange after authentication. JSON Web Token Cheat Sheet for Java ¶ Introduction ¶ Insecure Direct Object Reference Prevention
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