science

Xtraview Encryption System

Xtraview Encryption System is a 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 Xtraview Encryption System rather than just read about it. In short: Xtraview Video Encryption System refers to the now-defunct patented "encryption" system used on Xtraview and a number of other Top Up TV services, including Setanta Sports, Television X, Babestation and Red Hot TV. Unlike the other encryption system used by Top Up TV, Mediaguard, the Xtraview Video Encryption System was not a true encryption system.

Key takeaways

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

Reference excerpt

Xtraview Video Encryption System refers to the now-defunct patented "encryption" system used on Xtraview and a number of other Top Up TV services, including Setanta Sports, Television X, Babestation and Red Hot TV. Unlike the other encryption system used by Top Up TV, Mediaguard, the Xtraview Video Encryption System was not a true encryption system. Instead, an MHEG application directed the user's set-top box to a hidden videostream when a correct PIN is entered. Unlike traditional channel encryption methods, Xtraview did not require a viewing card. This is an advantage over digital terrestrial television in the UK, where the vast majority of set-top boxes have no ability to decrypt pay channels. Access to a channel protected using the Xtraview technology was granted by calling a premium rate telephone number. During the call, users were asked to give a number displayed on screen. In response, they were given a PIN to unlock the service. As of 2011 a similar system is in use by Babestation Xtreme, Red Hot TV, Television X and briefly by the now defunct TView on digital terrestrial television.

Criticism The PIN system has been subject to widespread hacking. Without encryption, the system was easily circumvented by set-top boxes that are able to access individual videostreams when individual stream PIDs are entered. More recently, the PIN algorithm itself was cracked, allowing others to access the service. Another downfall is that because the application is MHEG generated, if the set-top box was switched off, access to these channels was lost. It is also stated on-screen before purchase that not all boxes are compatible. Another factor is that a few cheaper boxes do not have MHEG support at all, and therefore cannot access the service.

External links Top Up TV Homepage

Worked examples

Example 1 — a first encounter with Xtraview Encryption System

Start with the simplest possible case. Write down what Xtraview Encryption System claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In 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 Xtraview Encryption System 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 Xtraview Encryption System 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 Xtraview Encryption System

In research: Xtraview Encryption System appears in 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 Xtraview Encryption System 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: Xtraview Encryption System is common in secondary-school and first-year university syllabi. It links to neighbouring topics Digital rights management systems, Television technology, so understanding it makes those chapters shorter.
In everyday life: Look for Xtraview Encryption System 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 Xtraview Encryption System in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Xtraview Encryption System 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 Xtraview Encryption System out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Xtraview Encryption System in simple terms?

Why does Xtraview Encryption System matter?

Because it connects several 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 Xtraview Encryption System?

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 Xtraview Encryption System.