What’s on the HTTPS & TLS poster
A definition and 6 facts worth remembering.
TLS wraps HTTP in encryption, using a certificate to prove the server controls the domain and a key exchange to agree a secret nobody watching can derive.
- Confidentiality: nobody in between can read it.
- Integrity: nobody in between can alter it undetected.
- Authenticity: the server controls that domain name.
- It does NOT mean the site is trustworthy or legitimate.
- Certificates are free and automatic — there is no cost excuse.
- HSTS tells browsers never to try plain HTTP again.
- Current — TLS 1.3
- Port — 443
- Cert life — ≤ 90 days typical
- A phishing site can have a perfectly valid certificate. The padlock says 'encrypted',…
TLS 1.3 removed the older weak options and cuts the handshake to one round trip. Disable everything below TLS 1.2.
Questions about the HTTPS & TLS poster
- What’s on the HTTPS & TLS poster?
- A definition and 6 facts worth remembering. TLS wraps HTTP in encryption, using a certificate to prove the server controls the domain and a key exchange to agree a secret nobody watching can derive. Confidentiality: nobody in between can read it.; Integrity: nobody in between can alter it undetected.; Authenticity: the server controls that domain name.; It does NOT mean the site is trustworthy or legitimate.; Certificates are free and automatic — there is no cost excuse.; HSTS tells browsers never to try plain HTTP again.; Current — TLS 1.3; Port — 443; Cert life — ≤ 90 days typical; A phishing site can have a perfectly valid certificate. The padlock says 'encrypted',…. TLS 1.3 removed the older weak options and cuts the handshake to one round trip. Disable everything below TLS 1.2.
- Who is the HTTPS & TLS poster for?
- HTTPS & TLS belongs to the Computing section rather than to a school year, because computing is not something one grade owns. Anyone learning security can pin it up — a beginner, a student mid-course, or someone revising years later.
- When should you use the HTTPS & TLS poster?
- TLS proves you are talking to that domain, privately. It says nothing about whether the domain is honest. A wall chart earns its place by being glanceable from where the work is happening, so HTTPS & TLS belongs on the wall where that computing work actually happens, within glancing distance, rather than filed away.
- What other posters go with HTTPS & TLS?
- Secrets, AuthN vs AuthZ and Hashing vs Encryption sit alongside HTTPS & TLS in the Computing section. Printed together they make a wall rather than a single sheet, which is how a reference set actually gets used.SecretsAuthN vs AuthZHashing vs Encryption
- Is the HTTPS & TLS poster free to download and print?
- Yes. HTTPS & TLS downloads as a free PDF with no account, no email and no watermark, like everything else in the Computing section. Print as many copies as you like for a home, a classroom, a library or a tutoring group; reselling the file is the only thing the licence rules out.Read the licence
- What size does the HTTPS & TLS poster print at?
- HTTPS & TLS is a vector PDF laid out for US Letter, and prints on A4 with Fit to page — the same file, no separate download. Because every mark on it is drawn rather than photographed, it stays sharp enlarged to A3, A2 or A1 at a copy shop. Colour carries emphasis only, so a greyscale print of HTTPS & TLS loses nothing.Printing guide
Related posters
Charts that sit alongside HTTPS & TLS on the same wall.
Browse every Computing poster, or start from the full catalogue.