TLS, PKI, DNS and other TLA

Lightning Talk
February 29th, 2024

What is TLS?

• Stands for Transport Layer Security
• Encrypts data in transit
• Supersedes SSL

What is PKI?

• Stands for Public Key Infrastructure
• Manages digital certificates
• Enables secure communication

What is DNS?

• Stands for Domain Name System
• Resolves domain names to IP addresses
• Enables human-readable URLs

How do TLS, PKI, and DNS work together?

• TLS uses PKI to secure connections
• DNS resolves domain names to IP addresses
• TLS web certificates encrypt traffic and confirm host identity

How do TLS certs get validated?

• Root CA signs intermediate CA
• Intermediate CA signs server certificate
• Client validates server certificate chain

How does signing authority trust you?

• Prove you own the domain by:
• Adding a DNS record
• Uploading a file to the server
• Responding to an email

Thank you!