This worked for me as an interesting deconstruction of the Found Footage formula (where the focus is on authenticating the footage as opposed to just showing it off), but I feel like it could have don...

50,000 Failed Logins a Minute. Nobody Got In. Your App Is Still Down.

SEALSQ, Eco Wave Power Pilot Secure Digital Energy Trades for AI Data Centers

Build internal tools that act on behalf of individual users through a standard OAuth 2.0 authorization code flow, so each action carries the consenting user's identity.

Authenticating to modern web apps is hard. The Authentication Helper add-on now has an AI Assisted Authentication method which uses an LLM to work out how to log in, then turns that into a fast, repea...

After authenticating Alice Cooper’s forgotten Warhol, Richard Polsky looks back on the downtown art world and the rise of the million-dollar painting.

A Degree Certificate Apostille is the process of authenticating your educational certificate with an Apostille stamp from the Ministry of External Affairs (MEA), India.

A bank overseas asks for your company’s incorporation documents. A foreign registry requests a power of attorney. A business partner needs proof...

# Kerberos PAC validation when the domain controller is unreachable Kerberos proves that a client holds a service ticket. The Privilege Attribute Certificate inside that ticket carries authorization data such as group membership. A service that trusts the PAC without checking its signatures can accept modified group claims. A service that asks a domain controller to validate every PAC can instead stop authenticating users when the network path to that controller fails. ## Know which check is local The PAC contains a Server Signature that the KDC creates with a key shared with the service, and a KDC signature that protects the authorization data. The service can verify the server signature locally with its key. A policy that requires stronger assurance can forward the PAC signature in a `KERB_VERIFY_PAC` message to a domain controller for validation. Those checks answer different questions. Local verification establishes that the PAC is bound to a KDC and service key. Domain-controller validation asks the authoritative Kerberos service to confirm the authorization data. Neither check proves that the account's current group membership is appropriate for a particular application action. ## Choose a deliberate failure mode PAC validation should have explicit behavior for timeout, refusal and a controller that returns no useful answer. Failing open preserves availability for anyone who can present a ticket and defeats the control. Failing closed protects the authorization boundary but can create a broad outage during a domain-controller incident. Do not hide the decision in a vague retry loop. Define the maximum wait, the set of controllers used and whether cached validation is allowed. If cached results are permitted, set their lifetime and make emergency invalidation possible. Attach the policy to the service or application tier because a payroll system and a read-only intranet page do not have the same tolerance. Monitor validation errors separately from bad password errors. Distinguish local signature failures, controller timeouts, controller refusals and authorization denials. Those signals lead to different owners and different recovery steps. ## Test under realistic failure Test a valid ticket with one controller unavailable, a forged PAC signature, a valid PAC from an unexpected service key and a group change that occurs during a cached validation window. Record whether the application denies the request, uses a documented cache or returns a distinct error. Review service-account keys and trust boundaries after the test. A service that can validate any PAC should not also be exposed as a general-purpose application account. Keep the authentication path and the business authorization decision separate so a PAC result cannot silently bypass an object-level permission check. The operational question is whether an unreachable controller creates a controlled denial or an authorization bypass. The answer should come from configuration and evidence, not from whichever code path happens to return first. ## References * MS-PAC: Server Signature * MS-APDS: Kerberos PAC Validation

Gestern veröffentlichte Vidoop eine erste Version ihrer Identity In The Browser-Extension für den Firefox 3. IDIB ist OpenSource und soll die OpenID-Verarbeitung, speziell in den Punkten Sicherheit und Browser-Redirects, verbessern. Die derzeitige Version des Addons bietet folgende Möglichkeiten: we help to reduce or eliminate browser-based redirects typically involved in authenticating against identity providers we add...

AWS Identity and Access Management (IAM) Roles Anywhere now supports automatic revocation checking using certificate revocation list (CRL) distribution points (CDPs). This helps keep revocation checks in sync with your certificate authority (CA) and can help improve your security posture. When you enable this capability on a trust anchor, IAM Roles Anywhere reads the CDP URLs embedded in authenticating certificates, downloads the corresponding CRLs, and denies credential requests that use revoked certificates. Previously, to check revocation status, you had to import CRLs into IAM Roles Anywhere and re-import them each time your CA published an update, which added operational overhead. With this launch, IAM Roles Anywhere downloads CRLs from your CDPs and refreshes them periodically, so you no longer need to re-import them. You can use this capability with AWS Private Certificate Authority or your own public key infrastructure (PKI), provided your certificates include publicly accessible CDP URLs that meet the distribution point requirements. To enable it on a trust anchor, use the IAM Roles Anywhere console, AWS SDKs, or AWS CLI. This feature is available at no additional cost in all commercial AWS Regions. To learn more, see Automatic revocation checking with CRL distribution points in the IAM Roles Anywhere User Guide.