computer science

Proton VPN

Proton VPN is a computer science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Proton VPN rather than just read about it. In short: Proton VPN is a VPN service launched in 2017 and operated by the Swiss company Proton AG, the company behind the email service Proton Mail. According to its official website, Proton VPN and Proton Mail share the same management team, offices, and technical resources, and are operated from Proton's headquarters in Plan-les-Ouates.

Key takeaways

Proton VPN belongs to computer science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Proton VPN to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Proton VPN from memory before moving on to harder problems.

Reference excerpt

Proton VPN is a VPN service launched in 2017 and operated by the Swiss company Proton AG, the company behind the email service Proton Mail. According to its official website, Proton VPN and Proton Mail share the same management team, offices, and technical resources, and are operated from Proton's headquarters in Plan-les-Ouates. On June 17, 2024, the company announced that it will be transitioning to a non-profit structure under the Proton Foundation.

Features Proton VPN has a total of 20,681 servers, sited at 191 locations in 148 different nations. Although Proton VPN owns and operates a portion of their servers, the bulk majority are owned and operated by ASNs such as M247 and Datacamp Limited. Its service is available for Windows, MacOS, Linux, Android, iOS, and ChromeOS and also has a command-line tool for Linux and can be implemented using the IPsec protocol. Proton VPN can also be installed on a wireless router. Proton VPN utilizes OpenVPN (UDP/TCP), IKEv2, and WireGuard (UDP/TCP) protocols with AES-256 encryption. On October 11, 2022, Proton VPN released their Stealth Protocol for Android, iOS and MacOS clients, designed to disguise VPN traffic as HTTPS traffic. In August 2024, Proton VPN announced that it had also added the Stealth protocol to its Windows client. Proton VPN has a no-logs policy that was independently audited by Securitum, a European security auditing company. In January 2020, Proton VPN released its source code on all platforms and had SEC Consult conduct an independent security audit. In March 2025, Vivaldi integrated Proton VPN into its desktop app, offering the free tier of Proton VPN to all Vivaldi users.

Reception In a January 2023 review by TechRadar, Proton VPN received 4-1/2 out of 5 stars. A May 2023 PC Magazine review gave Proton VPN a 5-star rating. Proton VPN was awarded their Editor's Choice Award in 2022 and 2023. In October 2023 technology website Engadget rated Proton VPN as the "best overall" for streaming, gaming, privacy and security. In January 2024 a comparative review of 10 different VPNs by German technology magazine CHIP rated Proton VPN as their test winner. In a 2025 TechRadar review of travel VPN services, Proton VPN was ranked second overall and described as the "best VPN for privacy," with emphasis on its Swiss jurisdiction, independent audits, no-logs policy, and advanced security features.

Illustrations

Worked examples

Example 1 — a first encounter with Proton VPN

Start with the simplest possible case. Write down what Proton VPN claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In computer science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Proton VPN before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Proton VPN ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Proton VPN

In research: Proton VPN appears in computer science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Proton VPN in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Proton VPN is common in secondary-school and first-year university syllabi. It links to neighbouring topics Free and open-source Android software, Proton AG, Virtual private network services, so understanding it makes those chapters shorter.
In everyday life: Look for Proton VPN outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Proton VPN in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Proton VPN means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Proton VPN out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Proton VPN in simple terms?

Why does Proton VPN matter?

Because it connects several computer science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Proton VPN?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Proton VPN.