Static, long-lived credentials for workload authentication create untenable security risks that violate Zero-Trust principles. This paper presents a multi-cloud framework using Workload Identity Federation (WIF) and OpenID Connect (OIDC) for secretless authentication. Our approach uses cryptographically-verified, ephemeral tokens, allowing workloads to authenticate without persistent private keys and mitigating credential theft. We validate this framework in an enterprise-scale Kubernetes environment, which significantly reduces the attack surface. The model offers a unified solution to manage workload identities across disparate clouds, enabling future implementation of robust, attribute-based access control.

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