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• Encrypting data-in-transit is important for compliance and zero-trust security in Kubernetes
• Common encryption options include mutual TLS and IPsec
• Project Calico uses WireGuard for full mesh encryption at a layer below application workloads
• WireGuard is lightweight, fast, scalable, and easy to configure
• Calico's data plane components interact with WireGuard to manage the kernel and networking rules
• The implementation has some gaps and areas for improvement