Cloud Data Security in 2025: Dangers, Safeguards, and More
March 13, 2025
Article · 8 min read
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Instructor: Vincent Gramoli
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(113 reviews)
Recommended experience
Beginner level
This course is for undergraduate to research students with basic knowledge of mathematics (graphs and sets) and data structure.
(113 reviews)
Recommended experience
Beginner level
This course is for undergraduate to research students with basic knowledge of mathematics (graphs and sets) and data structure.
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Blockchain promises to disrupt industries once it will be efficient at large scale. In this course, you will learn how to make blockchain scale. You will learn about the foundational problem of distributed computing, consensus, that is key to create blocks securely. By illustrating limitations of mainstream blockchains, this course will indicate how to improve the technology in terms of security and efficiency.
In particular, this course will help you: * understand security vulnerabilities of mainstream blockchains; * design consensus algorithms that tolerate attacks, and; * design scalable blockchain systems.
This week, we will start our exploration of the blockchain and its relation to distributed computing. In particular, we will learn the basics on blockchain abstraction and the importance of consensus between machines in order to mitigate the risks of having an attacker spend the same asset twice - an undesirable situation called 'double-spending'.
7 videos4 readings1 assignment1 discussion prompt
This week we will learn how classic blockchains try to solve consensus. We will look at the failures and delays blockchain systems must consider, and how these events may prevent machines from reaching consensus.
10 videos2 readings1 assignment1 discussion prompt
This week, we will investigate how to solve the consensus problem. To do this, we will first investigate how to solve consensus when failures cannot occur in the network. Later on, we will learn how to solve consensus when processes may fail, first through crash failures and then when processes can behave arbitrarily.
7 videos1 reading1 assignment1 discussion prompt
This week, we will investigate how delays in the network can impact the security of the blockchain. We will illustrate this using network attacks that allow hackers to steal digital assets in the past and that every blockchain designer should be aware of.
6 videos4 readings1 assignment1 discussion prompt
This week, we will explore how to design a scalable and secure blockchain algorithm. What makes a blockchain algorithm scalable and secure? To be secure, we need a consensus algorithm that works over the Internet and is not affected by unexpected communication delays. To be scalable, we need to get rid of the bottlenecks.
9 videos5 readings2 assignments2 discussion prompts
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Our excellence in research and teaching makes the University of Sydney one of the top universities in Australia and highly ranked among the best universities in the world. In 2020, we were ranked second in the Times Higher Education (THE) University Impact Rankings, and first in Australia in the QS Graduate Employability Rankings.
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Reviewed on Dec 24, 2022
This course is well explained and very useful for one who is at any level in the blockchain space.
Reviewed on Jun 18, 2023
Some practical aspects through simulation/ emiulation could have been included to provide more benefits to learners.
Reviewed on Sep 13, 2023
It great and gave awesome understanding of distributed systems and communication. However, this has prerequisites of blockchain knowledge.
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Access to lectures and assignments depends on your type of enrollment. If you take a course in audit mode, you will be able to see most course materials for free. To access graded assignments and to earn a Certificate, you will need to purchase the Certificate experience, during or after your audit. If you don't see the audit option:
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When you purchase a Certificate you get access to all course materials, including graded assignments. Upon completing the course, your electronic Certificate will be added to your Accomplishments page - from there, you can print your Certificate or add it to your LinkedIn profile. If you only want to read and view the course content, you can audit the course for free.
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