Master Thesis: Cryptography for offline payments

Karlskrona, SE
den 7 november 2021
den 16 november 2021
Övriga jobb
Why is Ericsson a good place to work?

Ericsson enables communications service providers to capture the full value of connectivity. The company's portfolio spans Networks, Digital Services, Managed Services, and Emerging Business and is designed to help our customers go digital, increase efficiency, find new revenue streams, and create new user experiences. Ericsson's investments in innovation have delivered the benefits of telephony and mobile broadband to billions of people around the world ensuring our solutions - and our customers - are at the forefront of innovation. We support networks that connect more than 2.5 billion subscribers. With over 100,000 employees and customers in 180 countries, we combine global scale with technology and service leadership. 40 percent of the world's mobile traffic is carried over an Ericsson network. And, our Technology for Good and Connect to Learn programs include creating technology that makes it easier to save lives, feed societies, bring technology to emerging markets and connectivity to remote areas, and grow businesses and prosperity.

At Ericsson, we give our employees the freedom to think big and navigate their career, on a global scale. We create technology that helps others, from helping people enjoy their favourite content to helping people recover from natural disasters by enabling better communications between rescue workers. Your ideas and innovations can turn into achievements that impact society and change the world, creating new connections, new possibilities, and new capabilities. We find that Ericsson is at its best when we bring together the diverse skills of our people. Working across business areas, across cultures, across geographical borders, across technical disciplines. More often than not, across ground-breaking solutions. Next generation technology can be staggeringly complex. But the simpler it is to use; the more people benefit from it. Join us and help build technology that makes it simple to connect with information, business, societies, and each other.

Our Exciting Opportunity

Ericsson is developing a digital financial platform that is already improving the lives of millions of daily users in Africa, the Middle East and Latin America. By helping us to also enable offline payments, where funds can be transferred from a payer to a payee without network connectivity, you will help to increase financial freedom to many people around the world in places where telecommunications, or even electricity, are a scarcity. Enabling offline payments will also increase the robustness of the platform all over the world, as temporary disruptions can occur anywhere.

The problem we would like to investigate as part of the thesis is how to perform an offline payment in a secure manner, so that the electronic cash can't be forged or double spent.

This master thesis is divided into several steps with the end goal of showing a prototype of how offline payments can be performed in a secure manner, or at least significantly limiting the risk, in an account based financial platform.

We are looking for 1 or 2 students for this project that will start in January. The main office for the project will be in Karlskrona, most parts of the project can be done remotely.

You will

  • Study existing literature and research regarding offline electronic payments. Example questions: How to optionally preserve anonymity of the Payer in an offline payment? How to avoid forgery of electronic cash? How to prevent, or at least detect, double spending of electronic cash? Can electronic cash be further transferable to other Payees before it is deposited in a secure and high-performing manner? Can electronic cash be divisible (i.e. not only pre-defined specific denominations such as 1, 2, 5, 10, … when something costs 2.99) in a secure and high-performing manner?
  • Discuss implementation options
  • Implement a proof of concept

The thesis will be concluded with a result presentation for the Ericsson Mobile Financial Services team.

To be successful in the role you must

  • Be a MSc-student in Computer science, Software Engineering, Telecommunication Systems, or similar
  • Programming experience in Java
  • Ability to work independently and to collaborate with team members
  • Good English skills, both written and spoken
  • An interest in financial services, digital currencies, or cryptocurrencies is preferred
  • Experience within cryptography is preferred


You are welcome to send your application as soon as possible in English, and please note that we do not accept applications via email. If you have any questions, reach out to primary recruiter Jacob at .

What´s in it for you?

Here at Ericsson, our culture is built on over a century of courageous decisions. With us, you will no longer be dreaming of what the future holds - you will be redefining it. You won't develop for the status quo, but will build what replaces it. Joining us is a way to move your career in any direction you want; with hundreds of career opportunities in locations all over the world, in a place where co-creation and collaboration are embedded into the walls. You will find yourself in a speak-up environment where empathy and humanness serve as cornerstones for how we work, and where work-life balance is a priority. Welcome to an inclusive, global company where your opportunity to make an impact is endless.

What happens once you apply?

To prepare yourself for next steps, please explore here:

Do you believe that an organization fostering an environment of cooperation and collaboration to execute with speed creates better business value? Do you value a culture of humanness, where fact based decisions are important and our people are encouraged to speak up? Do you believe that diverse, inclusive teams drive performance and innovation? At Ericsson, we do.

We provide equal employment opportunities without regard to race, color, gender, sexual orientation, transgender status, gender identity and/or expression, marital status, pregnancy, parental status, religion, political opinion, nationality, ethnic background, social origin, social status, indigenous status, disability, age, union membership or employee representation and any other characteristic protected by local law or Ericsson's Code of Business Ethics.

Primary country and city: Sweden (SE) || || Karlskrona || [[mfield2]]

Req ID: 598662