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Everyday Cryptography

The importance of cryptography and its role in our everyday lives has never been greater. This course of Everyday Cryptography explains both why and how.

Beginner

181 Lessons

30h

Certificate of Completion

The importance of cryptography and its role in our everyday lives has never been greater. This course of Everyday Cryptography explains both why and how.

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This course includes

57 Playgrounds

16 Quizzes

Course Overview

What You'll Learn

Course Content

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Course Overview

In recent years, the world has witnessed an exponential increase in data. As applications—such as those belonging to financial institutions and governments—become more widespread and the traffic over insecure networks increases, it becomes increasingly important to understand information security principles and techniques. With this goal in mind, “Everyday Cryptography” introduces learners to different aspects of cryptography. The course begins by explaining the key pillars of information security. It intr...Show More

What You'll Learn

An understanding of the fundamental principles of information security

A working knowledge of symmetric (or private key) encryption

A working knowledge of asymmetric (or public key) encryption

Familiarity with techniques for data integrity and authentication

An understanding of key management techniques

Ability to assess the strengths and weaknesses of cryptographic protocols

Introduction to cryptography for personal devices and day-to-day activities

An understanding of potential issues when cryptography and government policy come face to face

An understanding of the fundamental principles of information security

Course Content

Introduction

2 Lessons

Get familiar with cryptography's core principles, practical applications, and societal implications.

About This Course

Course Structure

Basic Principles

15 Lessons

Grasp the fundamentals of information security, cryptography principles, and securing digital communications.

Why Information Security?

Perspectives and Security Infrastructure

Security Risks

Security Services

Relationships between Security Services

Fundamentals of Cryptosystems

Basic Model of a Cryptosystem

Components of Cryptography

Cryptosystem Security Assumptions

Advantages and Usage of Publicly Known Encryption Algorithms

Breaking Cryptosystems

Cryptosystems and Encryption Algorithms

Exhaustive Key Searches

Classes of Attack

Recap of Basic Principles

Historical Cryptosystems

8 Lessons

Examine historical cryptosystems' evolution, keyspace importance, and mitigation techniques for frequency analysis.

Ceasar Cipher

Simple Substitution Cipher

Frequency Analysis

Frequency Analysis—Theory vs Practice

Playfair Cipher

Homophonic Encoding

Vigenère Cipher

Recap of Historical Cryptography

Theoretical versus Practical Security

9 Lessons

Grasp the fundamentals of theoretical versus practical cryptographic security, including perfect secrecy and key management challenges.

Theoretical Security

One-Time Pads

One-Time Pad Examples

Vernam Cipher

Practical Security

Computational Complexity

Design Process of a Cryptosystem

Evaluating Security

Recap of Theoretical versus Practical Security

Symmetric Encryption

14 Lessons

Dig into types, properties, and applications of symmetric encryption algorithms.

Classification of Symmetric Encryption Algorithms

Stream Ciphers

Block Ciphers

The Data Encryption Standard

Exploring the History of DES

Triple DES

The Advanced Encryption Standard

Modes of Operation: ECB Mode

Modes of Operation: CBC Mode

Modes of Operation: CFB Mode

Modes of Operation: CTR Mode

Comparing Modes of Operation

Use of Symmetric Encryption

Recap of Symmetric Encryption

Public-Key Encryption

14 Lessons

Follow the process of understanding public-key encryption, RSA, ElGamal, ECC, and their applications.

Public-Key Cryptography

Some Mathematical Preliminaries

One-Way Functions for Public-Key Cryptography

RSA Key Pair Generation

RSA Encryption and Decryption

Why RSA Works

Security of RSA

RSA in Practice

ElGamal—Encryption and Decryption

ElGamal—Security and Practice

Elliptic Curve Cryptography

Comparison of RSA, ElGamal, and ECC

Use of Public-Key Encryption

Recap of Public-Key Encryption

Data Integrity

11 Lessons

Master the steps to ensure data integrity using hash functions, MACs, and authenticated encryption.

Different Levels of Data Integrity

Hash Functions

Applications of Hash Functions

Attacking Hash Functions in Theory

Hash Functions in Practice

SHA-3

Message Authentication Codes

CBC-MAC

HMAC

Using MACs with Encryption

Recap of Data Integrity

Digital Signature Schemes

9 Lessons

Sharpen your skills in utilizing digital signatures for secure authentication and non-repudiation.

Digital Signatures

Non-Repudiation Using Symmetric Techniques

Digital Signature Schemes based on RSA

RSA Digital Signature Scheme with Appendix

RSA Digital Signature Scheme with Message Recovery

Digital Signature Schemes in Practice

Relationship with Handwritten Signatures

Relationship with Advanced Electronic Signatures

Recap of Digital Signature Scheme

Entity Authentication

8 Lessons

Solve challenges with entity authentication for secure and fresh communication.

Random Number Generation

Providing Freshness

Fundamentals of Entity Authentication

General Categories of Identification Information

Passwords

Dynamic Password Schemes

Zero-Knowledge Mechanisms

Recap of Entity Authentication

10.

Cryptographic Protocols

16 Lessons

Work your way through the design, analysis, and implementation of cryptographic protocols.

Protocol Basics

From Objectives to a Protocol

Analyzing a Simple Protocol

Authentication and Key Establishment Protocols

Diffie-Hellman Key Agreement Protocol

Man-in-the-middle Attack on the Diffie-Hellman Protocol

AKE Protocols Based on Diffie-Hellman

An AKE Protocol Based on Key Distribution

Recap of Cryptographic Protocols

11.

Key Management

15 Lessons

Grasp the fundamentals of securing and managing cryptographic keys through various methods and principles.

Key Management Fundamentals

Requirements of Key Management

Key Lengths and Lifetimes

Key Generation

Key Establishment

Unique Key per Transaction Schemes

Quantum Key Establishment

Key Storage in Software

Key Storage in Hardware

Key Storage Risk Factor

Key Usage Issue—Key Separation

Key Usage Mechanism—Key Change

Key Usage Mechanisms—Key Activation and Destruction

Governing Key Management

Recap of Key Management

12.

Public-Key Management

10 Lessons

Take a closer look at managing public keys, focusing on certificates and alternative approaches.

Certification of Public Keys

Public-Key Certificates

The Certificate Lifecycle

Certificate Creation

Key Pair Change

Public-Key Management Models

Joining CA Domains

Alternative Approaches—Webs of Trust

Alternative Approaches—Identity-Based Encryption

Recap of Public-Key Management

13.

Cryptographic Applications

31 Lessons

See how cryptography secures internet, wireless networks, payments, telecommunications, anonymity, and digital currencies.

Cryptography for Securing the Internet

TLS 1.2 and Earlier Versions

TLS 1.3

TLS - Key Management

TLS—Security Issues and Design

Cryptography for Wireless Local Area Networks

WEP

Attacks on WEP

WPA and WPA2

WLAN - Security Issues and Design

Cryptography for Mobile Telecommunications

Cryptography used in GSM

UMTS

LTE

Mobile Telecommunications—Key Management, Security, and Design

Cryptography for Secure Payment Card Transactions

EMV cards

Usage of EMV Cards

Payment Card—Key Management, Security, and Design

Cryptography for Video Broadcasting

Video Broadcasting—Key Management, Security, and Design

Cryptography for Identity Cards

eID—Key Management, Security, and Design

Cryptography for Anonymity

Tor Key Establishment

Tor—Key Management, Security,and Design

Cryptography for Digital Currency

Bitcoin Blockchain

Bitcoin Mining

Bitcoin—Security Issues and Design

Recap of Cryptographic Applications

14.

Cryptography for Personal Devices

5 Lessons

Enhance security on personal devices with cryptographic methods for file protection, email, messaging, and platforms.

Recap of Cryptography for Personal Devices

15.

Control of Cryptography

6 Lessons

Learn how to use strategies to balance cryptography security and accessibility, addressing ethical dilemmas.

The Cryptography Dilemma

Backdoors in Algorithms

Legal Mechanisms

Control of Cryptography in an Age of Complexity

Strategies for Controlling Ubiquitous Cryptography

Recap of Control of Cryptography

16.

Mathematics Appendix

6 Lessons

Get started with essential mathematical principles for cryptographic systems, including decimals, binary, hex, ASCII, modular arithmetic, RSA, and ElGamal.

The Mathematics of RSA

The Mathematics of ElGamal

17.

Closing Remarks

2 Lessons

Examine the importance of cryptography and acknowledge the foundational knowledge acquired.

Recapping the Course

Course Author

Oxford University Press

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