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The objective of this course is to highlight the threats faced by computer systems, with a focus on protecting the data they handle. Once these threats are understood, the course explores cryptographic mechanisms that can mitigate them. These mechanisms are also directly or indirectly used in blockchains. The fundamentals of blockchains, the programming of applications based on them, and their associated security issues are also covered in this course. Finally, a brief overview of the regulatory and legal aspects related to cybersecurity is provided.

1.- IT Security introduction 1.1. Definitions 1.2. Security services 1.3. Security mechanisms 1.4. Vulnerabilities and threats. Current situation 2.- Cryptography notions 2.1. Entropy and randomness 2.2. Attacks. Complexity 3.- Security mechanisms for financial data 3.1. Data encryption 3.2. Authentication 3.3. Hash functions 3.4. Digital signatures 4.- Blockchain fundamentals and its applications 4.1. Blockchain. Basic concepts 4.2. Consensus strategies 4.3. Smart contracts 4.4. Blockchain applications 5.- Cryptocurrencies 5.1. Bitcoin 5.2. Ethereum 5.3. Monero 5.4. Other altcoins 6.- Legal framework 6.1. GDPR 6.2. eIDAS 6.3. NIS Directive 6.4. Spanish National Security Scheme 6.5. Other regulations

Learning activities AF1 Theoretical sessions AF2 e-learning activities AF3 Theoretical and practical assignments AF4 Lab assignments AF5 Tutorials AF6 Work in groups AF7 Individual work by the student Methodology MD1 Lectures in which the main concepts are developed and the bibliography is pointed out. MD2 Reading of materials provided by the lecturer to support the notions addressed in the subject MD3 Practical case resolution, either individually or in groups MD5 Development of assignments and reports either individually or in groups MD6 e-learning-related activities Tutorials will be scheduled in two time frames per week. Their schedule will be published through Aula Global. Tutorials will be either physical or through online means. They will have to be requested sufficiently in advance by e-mail. Students may also request other schedules, upon availability of the lecturer.