TLS (Transport Layer Security) is the protocol that encrypts and authenticates data travelling between two systems. Typical pairs are a browser and a web server, or two internal services.
API security is the practice of protecting application programming interfaces from misuse. It controls who can call them, what data they can reach and how much they can request.
A service mesh is an infrastructure layer that manages communication between services. It handles encryption, retries, traffic routing and telemetry consistently, without changes to application code.
Encryption at rest and in transit means protecting data with encryption both while it is stored and while it moves across networks. Stolen or intercepted data then stays unreadable without the keys.
Post-quantum cryptography is the family of encryption and signature algorithms designed to resist attacks by future quantum computers. The algorithms run on today's ordinary hardware.
Public key infrastructure (PKI) is the system of certificate authorities, certificates and policies that binds public keys to identities. It lets parties trust encrypted connections and digital signatures.
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