Symmetric and asymmetric encryption: why they're used together
Two families of keys with opposite strengths. Why TLS doesn't pick one, but combines both.
Learning path
Applied cryptography, no hand-waving
What each primitive actually protects: encryption, hashing and certificates, and where they get confused in production.
By the end you'll understand
what each primitive guarantees —confidentiality, integrity, identity— why a hash is not encryption, and what really underpins the trust in a certificate.
Hashing is not encryption: why a password isn't "decrypted"
The most common confusion of all. What a hash is, how it differs from encryption, and why it matters for your passwords.
Digital certificates: why your browser trusts a site
What a certificate is, who signs it, and how the chain of trust that holds up the web is built.