TLS Protocol Security Questions

Deep understanding of transport layer security protocols and their secure deployment. Topics include TLS handshake mechanics, cipher suite negotiation, certificate validation and management, session resumption and key exchange algorithms, forward secrecy, common vulnerabilities and mitigations such as downgrade and padding oracle attacks, practical configuration for servers and clients, certificate revocation and lifecycle management, and compatibility considerations across protocol versions.

HardSystem Design

32 practiced

Design server-side anti-replay protections for TLS 1.3 0-RTT early data for an API that must accept idempotent GETs and sometimes allows POSTs that are made idempotent via idempotency keys. Propose data structures and algorithms for tracking replays in a distributed system while keeping memory/cost reasonable.

EasyTechnical

37 practiced

List common tools and basic commands an SRE would use to validate a server's TLS configuration and troubleshoot issues (e.g., openssl s_client, s_server, curl with --capath, sslyze, testssl.sh, Wireshark/tcpdump). Show an example command to test SNI and TLS 1.2 support.

EasyTechnical

37 practiced

Explain OCSP and OCSP stapling. What problem does stapling solve compared to naive client-side OCSP? Describe how to configure (conceptually) OCSP stapling on a web server and what monitoring you would add to detect missing or stale stapled responses.

EasyTechnical

37 practiced

Given the cipher suite string TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256, explain each component: key exchange, authentication, symmetric cipher and mode, and hashing/PRF. How does that information help you choose server-side cipher order for security and performance?

HardTechnical

28 practiced

An on-call alert reports that a private key for a TLS server may have been exfiltrated. Walk through your incident response plan: containment, impact assessment (which certificates/hosts use the key), revocation and re-issuance strategy, communicating with customers and CAs, and validating that the compromise is mitigated (CT log monitoring, logs review).

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