Stack Exchange network consists of 176 Q&A communities including Stack Overflow, the largest, most trusted online community for ... To solve the problem I thought about creating an AJAX function that returns a fresh nonce, to be requested before a form is submitted. This nonce will be then appended to the form as a hidden field. Do you think it's a safe approach? PHP function to return a fresh ... Because the keys are distinct, using the same nonce isn't an issue. Technical point that doesn't actually change the answer: actually, what's sent over the wire is actually the latter 64 bits of the nonce; 32 bits of the nonce are also derived when we generate the keys. Of course, the same 32 bits might be picked for both directions. On the ... Bitcoin Nonce is a 4-byte (32-bit) field in the input (block’s header, to be explained later…) of the SHA-256 function that is used to produce Bitcoin Hashes.The nonce needs to be set in such a way that its hashed output should have a certain number of leading zeros and to achieve these miners keep playing with this 4-byte field. The OIDC standard requires the nonce parameter in the authentication request when using the implicit flow:. nonce REQUIRED. String value used to associate a Client session with an ID Token, and to mitigate replay attacks. However in the hybrid flow the nonce is not required. Yet the id_token is directly returned in the response and also susceptible to injection or replay. I'm trying to integrate an MVC4 web client with IdentityServer using Microsoft OWIN middleware OIDC authentication v4.0.0. When requesting an ID token from the authorize endpoint, a nonce must be supplied, and the login page served up has the nonce in the query string.
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