science

Mobile Signature Service

Mobile Signature Service 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 Mobile Signature Service rather than just read about it. In short: Mobile Signature Service (MSS) is a high-level service specified by the European Telecommunications Standards Institute that defines the roles participating in mobile identity management and mobile signature transactions, as well as functional and business-related requirements and interfaces. The specification is the governing standard for PKI and enables cross-compatible mobile signature solutions.

Key takeaways

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

Reference excerpt

Mobile Signature Service (MSS) is a high-level service specified by the European Telecommunications Standards Institute that defines the roles participating in mobile identity management and mobile signature transactions, as well as functional and business-related requirements and interfaces. The specification is the governing standard for PKI and enables cross-compatible mobile signature solutions.

Background The mobile signature services industry began in the early 2000s, with the release of the European Telecommunications Standards Institute (ETSI) mobile commerce standards (ETSI 102 203, 102 204, 102 206 and 102 207). The standards defined mobile signature as a universal method for using a mobile device to confirm the intention of a citizen to proceed with a transaction (digitally sign transactions on their mobile devices, turning the mobile device into personal trusted devices.) and mobile signature service as a facility that coordinates and manages the mobile signature process.

Roles

Mobile user The mobile user is either a private person in possession of the mobile device, or a device embedded in the mobile device to which a mobile signature is associated.

Application provider The application provider (AP) provides the service that the mobile user wishes to authenticate themselves to or the contract that the user wishes to sign.

Smart card issuer The smart card issuer, typically a mobile network operator, issues the mobile user with a smart card that is in some form capable of completing signature operations and on-board key generation. The issuer associates itself with an MSSP.

Registration authority The registration authority (RA), typically a mobile network operator, is in charge of registering Mobile Users to MSS.

Certificate authority The certificate authority (CA) is a service, typically a third party, that issues digital certificates to the mobile user's public key.

Mobile signature service provider The mobile signature service provider (MSSP) is a service that facilitates the communication between the AP and the mobile user's SIM card. The MSSP of the ETSI specification typically consists of a HomeMSSP, AE (acquiring entity) MSSP and possibly an RE (routing entity). APs connect to a HomeMSSP via AE MSSPs. HomeMSSPs connect to the mobile user's SIM card directly.

Establishing a mobile identity When a Mobile User subscribes to a Mobile Signature Service, the RA confirms their identity and binds their identity to a key pair as per public key infrastructure. The keys can be generated server-side or on the User's SIM card with On-Board Key Generation. With OBKG, the SIM card generates the key pair, sends the public key to the MSSP to be bound by the RA and certified by the CA, and has the Mobile User assign a signing PIN on the private key, which begins its existence on and never leaves the SIM card.

Completing a signature transaction When a mobile user accesses an AP's service and wishes to perform a mobile signature, the AP sends a signature request to the mobile user's HomeMSSP via an AE MSSP. The MSSP forwards the AP's request to the mobile user's SIM card. Upon receiving the signature request, the mobile user's SIM card can only complete the signature when the mobile user gives their signing PIN. The requested data is signed with the mobile user's private key and sent back to the mobile user's HomeMSSP, which then returns the signature to the AP, who can verify it with the mobile user's public key.

Roaming The ETSI mobile commerce standard TS 102 207 defines a roaming framework between multiple MSS systems. If the AP and Mobile User's HomeMSSPs are different, the AP's MSSP can reach the Mobile User's by roaming. This way, an AP can make a contract with any of the MSS system operators provide a service for all Mobile Users in the MSS mesh.

Revoking an identity If at any point there is reason to believe that the user's mobile identity is at risk, they may ask the mobile network operator to have the CA revoke their certificate. Revoking the certificate of a user's public key makes the key pair unusable. Commonly, a revoked certificate cannot be reinstated remotely. Instead, a user must re-register in person in order to resume the use of MSS.

References

Illustrations

Worked examples

Example 1 — a first encounter with Mobile Signature Service

Start with the simplest possible case. Write down what Mobile Signature Service 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 Mobile Signature Service 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 Mobile Signature Service 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 Mobile Signature Service

In research: Mobile Signature Service 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 Mobile Signature Service 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: Mobile Signature Service is common in secondary-school and first-year university syllabi. It links to neighbouring topics Mobile telecommunications standards, Signatures, so understanding it makes those chapters shorter.
In everyday life: Look for Mobile Signature Service 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 Mobile Signature Service in 20 minutes

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

Frequently asked questions

What is Mobile Signature Service in simple terms?

Why does Mobile Signature Service 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 Mobile Signature Service?

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 Mobile Signature Service.