HTTPS
5 letters
Historical clue formulations
- Start of an encrypted web address — 2024-12-25
- Start of an encrypted URL address — 2023-05-22
- Internet encryption inits. — 2022-03-20
- Encrypted URL component — 2021-09-05
- Start of an encrypted web address — 2021-06-10
- Certain address starter — 2014-09-20
- U.R.L. opener indicating an additional layer of encryption — 2009-04-24
