HMAC-SHA256
A keyed message authentication code based on the SHA-256 hash function and a secret key, used to verify message integrity and authenticity and to provide resistance to tampering.
Timeline (last 90 days)
HMAC-SHA256 is a message authentication code based on the SHA-256 hash function and a key, used to verify message integrity and authenticity; its tamper-evidence depends on key management, and if the key leaks the tamper-evidence property fails.
A minimal audit receipt should contain receipt_id, subject_id, task, created_at, token budget (max_tokens/used_tokens), an included array (with memory_id, kind, source episode, token count, and rank), an excluded array (with exclusion reasons such as policy:deny:pii or budget), and an integrity field (HMAC-SHA256 digest).
GitHub's webhooks use the X-Hub-Signature-256 request header and compute a signature over the request body using the HMAC-SHA256 algorithm.
Stripe verifies the origin of webhook requests by performing an HMAC-SHA256 check on the request body and timestamp using the Stripe-Signature header.
Webhook signature verification typically uses the HMAC-SHA256 algorithm, with the signature covering the timestamp and request body content, and the receiver locally recomputes the signature with the shared secret and compares it.
Stripe computes the signature over the raw bytes (raw body) of a webhook request using HMAC-SHA256 and passes it in the Stripe-Signature header, and parsing with request.json() will cause signature verification to fail due to re-serialization.
Meta verifies the authenticity of webhook messages using HMAC-SHA256 signature verification of the raw body via X-Hub-Signature-256.
Stripe's signature algorithm computes an HMAC-SHA256 over the exact raw bytes received, and the server must recompute the signature over exactly the same bytes for the comparison to succeed.
All Facts (9)
The sign parameter in APP requests is the core mechanism by which the server verifies the legitimacy of a request, typically computing a hash value using HMAC-SHA256, MD5, or a custom algorithm.
60%UnverifiedHMAC-SHA256 is a message authentication code based on the SHA-256 hash function and a key, used to verify message integrity and authenticity; its tamper-evidence depends on key management, and if the key leaks the tamper-evidence property fails.
50%UnverifiedA minimal audit receipt should contain receipt_id, subject_id, task, created_at, token budget (max_tokens/used_tokens), an included array (with memory_id, kind, source episode, token count, and rank), an excluded array (with exclusion reasons such as policy:deny:pii or budget), and an integrity field (HMAC-SHA256 digest).
50%UnverifiedGitHub's webhooks use the X-Hub-Signature-256 request header and compute a signature over the request body using the HMAC-SHA256 algorithm.
50%UnverifiedStripe verifies the origin of webhook requests by performing an HMAC-SHA256 check on the request body and timestamp using the Stripe-Signature header.
50%UnverifiedWebhook signature verification typically uses the HMAC-SHA256 algorithm, with the signature covering the timestamp and request body content, and the receiver locally recomputes the signature with the shared secret and compares it.
50%UnverifiedStripe computes the signature over the raw bytes (raw body) of a webhook request using HMAC-SHA256 and passes it in the Stripe-Signature header, and parsing with request.json() will cause signature verification to fail due to re-serialization.
50%UnverifiedMeta verifies the authenticity of webhook messages using HMAC-SHA256 signature verification of the raw body via X-Hub-Signature-256.
50%UnverifiedStripe's signature algorithm computes an HMAC-SHA256 over the exact raw bytes received, and the server must recompute the signature over exactly the same bytes for the comparison to succeed.
50%