Authentication Explained:A Complete History of Login Systems

Authentication didn’t start with biometrics or cryptography. It began in the 1960s with plain text password and everything since has been a response to breaking those early systems.
In this video, we walk through the major eras that shaped how we prove identity today—from one‑time passwords and hashing, to public‑key systems, biometrics, behavioral signals, and the rise of passkeys.
If you’ve ever wondered how we got here, or how the technologies behind modern authentication actually evolved, this is the complete timeline.
What you’ll learn:
✅ How early password systems worked (and failed)
✅ Why hashing and salting became critical
✅ The emergence of encryption + key exchange
✅ OTP systems: hardware, software, SMS
✅ Rise of public/private key authentication
✅ Biometrics and secure enclaves
✅ The shift toward passkey‑driven, passwordless login
✅ Behavioral authentication and continuous signals
Perfect for developers, cybersecurity learners, and anyone curious about the tech that protects our digital lives.

⏱️Timestamps :
00:00 – Intro
00:31 – The Birth of Passwords (1960s)
01:07 – Hashing, Salting, and Authentication Hardening
02:03 – OTP Era (Tokens, Apps, SMS)
03:51 – Encryption & Key Exchange
05:30 – Public/Private Keys & PKI
06:33 – Multi‑Factor Authentication
08:09 – Multi‑Factor Authentication
08:47 – Biometrics & Secure Enclave
10:40 – The Passwordless Shift: Passkeys
11:14 – Behavioral Authentication



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