Ayush Kumar Rai

KMIP standardizes how applications communicate with key management systems for creating, storing, and retrieving cryptographic keys. Here's how it works, what operations it supports, and where it fits in enterprise key management.

PCI DSS mandates encryption for cardholder data in transit and at rest. Here's what the standard requires for TLS, key management, and certificate handling, and where organizations fail audits.

ACME automates TLS certificate issuance and renewal without human intervention. Here's how to set it up with Certbot, acme.sh, and cert-manager — with real configs for Nginx, Apache, and Kubernetes.

A cipher suite is the combination of algorithms negotiated during a TLS handshake: key exchange, authentication, encryption, and hashing. Here's how to read them, which to enable, and which to disable.

A CRL is a signed list of revoked certificate serial numbers published by a CA. Here's how CRLs work, why they don't scale, and why they're still required in enterprise PKI despite their limitations.

SSH certificates add expiry, identity, and centralized trust to SSH authentication — eliminating authorized_keys management. Here's how they work, how to set them up, and why they're replacing static SSH keys.

Certificate-based API authentication uses mTLS to verify both client and server identity without shared secrets. Here's how it works, when to use it over API keys or OAuth, and where implementation fails.

Workload identity assigns cryptographic identities to software workloads (pods, VMs, serverless functions) instead of relying on network location or static credentials. Here's how SPIFFE, cloud workload identity, and service meshes implement it.

Provisioning and deployment is the process of delivering a signed certificate to its target system and activating it. Here's how it works across different infrastructure types, and where the handoff between issuance and deployment fails.

HashiCorp Vault's PKI secrets engine turns Vault into a certificate authority — issuing, renewing, and revoking certificates via API. Here's how to set it up, integrate with applications, and where Vault PKI fits in your certificate architecture.