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I'm using JWT RS256 algorithm in my current project, but I'm wondering what are the differences between algorithms RS256, RS384, and RS512. Can someone explain to me what are the key differences in these algorithms?
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HS256 is a symmetric algorithm that shares one secret key between the identity provider and your application. The same key is used to sign a JWT and allow verification that signature. RS256 algorithm is an asymmetric algorithm that uses a private key to sign a JWT and a public key to verification that signature.
The option with the best security and performance is EdDSA, though ES256 (The Elliptic Curve Digital Signature Algorithm (ECDSA) using P-256 and SHA-256) is also a good choice. The most widely used option, supported by most technology stacks, is RS256 (RSASSA-PKCS1-v1_5 using SHA-256).
RSASSA-PSS (e.g. PS256) RSASSA-PSS is the probabilistic version of RSA, where the same JWT header and payload will generate a different signature each time. Unlike other algorithms, this is probabilistic in a good way; while a random value may be used during signature generation, it is not critical to security.
This is the set of algorithms defined for use with JWS in RFC 7518 -JSON Web Algorithms (JWA)
The difference between RS256, RS384, and RS512 is the hashing algorithm SHA256, SHA384 and SHA512
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