Today I Learned
Short notes on things I didn't know yesterday.
Jun 2, 2026#networking #security-plus
Port 22 vs port 23 is a one-digit history lesson
Telnet (23) sends everything in plaintext, including your password. SSH (22) exists because of exactly that. One digit apart on purpose-ish, decades apart in attitude. The Security+ exam loves this pair.
May 27, 2026#crypto #security-plus
Hashing is not encryption
Encryption is reversible if you have the key. Hashing is a one-way function — there is no key, no 'decrypt'. That's why sites can't email you your old password (and why you should run if one does).
May 14, 2026#wifi #social-engineering
The 'evil twin' attack is just customer-service psychology
Set up a fake hotspot named like the real one ('CAFE_GUEST_WIFI') and people connect because it looks familiar. After two years of watching customers trust whoever wears the uniform, this attack made instant sense to me.