Instructor Introduction

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Del curso dictado por University of Colorado System

Asymmetric Cryptography and Key Management

29 calificaciones

University of Colorado System

Asymmetric Cryptography and Key Management

29 calificaciones

Curso 3 de 4 en SpecializationApplied Cryptography

Welcome to Asymmetric Cryptography and Key Management! In asymmetric cryptography or public-key cryptography, the sender and the receiver use a pair of public-private keys, as opposed to the same symmetric key, and therefore their cryptographic operations are asymmetric. This course will first review the principles of asymmetric cryptography and describe how the use of the pair of keys can provide different security properties. Then, we will study the popular asymmetric schemes in the RSA cipher algorithm and the Diffie-Hellman Key Exchange protocol and learn how and why they work to secure communications/access. Lastly, we will discuss the key distribution and management for both symmetric keys and public keys and describe the important concepts in public-key distribution such as public-key authority, digital certificate, and public-key infrastructure. This course also describes some mathematical concepts, e.g., prime factorization and discrete logarithm, which become the bases for the security of asymmetric primitives, and working knowledge of discrete mathematics will be helpful for taking this course; the Symmetric Cryptography course (recommended to be taken before this course) also discusses modulo arithmetic. This course is cross-listed and is a part of the two specializations, the Applied Cryptography specialization and the Introduction to Applied Cryptography specialization.

De la lección

Asymmetric Cryptography Overview

This module reviews the principles and requirements of asymmetric cryptography, which uses a pair of keys - with one party using a public key and the other using the corresponding private key or vice versa - in contrast to symmetric cryptography using a shared secret key.

Instructor Introduction4:12

Module Objectives1:31

Conoce a los instructores

Sang-Yoon Chang
Assistant Professor
Computer Science

Hello. My name is Sang-Yoon Chang,

and I'm an assistant professor at the computer science department at UCCS,

University of Colorado, Colorado Springs.

I received my Ph.D. from the Electrical and Computer Engineering Department at UIUC,

University of Illinois at Urbana-Champaign.

In graduate school, I worked on securing the wireless link for computer networks.

And my work involves theoretical analysis and design,

as well as the use of software defined radios and

microcontrollers for implementation and validation.

Since my Ph.D., I continued my research to secure networking systems,

and my research interests span across multiple disciplines such as computer security,

applied cryptography, computer network, and wireless communications.

My research also has high synergy with the recent developments in IOT,

the Internet of Things,

and cyber physical systems.

This specialization focus on Applied Cryptography,

which provides fundamental set of techniques for securing information transfer.

Whether that information transfer is in the forms of networking transmission,

or data access of a file.

While cryptography originated from protecting

the secrecy or the confidentiality of messages,

it's application now a days also includes integrity protection,

such as digital transactions, and bitcoins,

and key establishment, which can also help with the system availability.

For example, by providing a seat or a key for random access.

In addition to learning the cryptographic techniques and

their purposes so that you can identify and apply the techniques,

in this specialization, you will also learn about

the history and the progression of cryptography with concrete examples.

We will discuss about the relevant questions

raised during the cryptographic developments.

Those questions that are significant enough to affect

the algorithm developments and the cryptography landscape.

The motivation for taking such approach is so that this specialization can

provide you with a better feel about the logic behind the cryptographic scheme design.

In other words, while applying or using a cryptographic algorithm,

may be possible while treating the algorithm as a black box,

and only knowing the input output relationships.

In this specialization, you will also have the opportunities to practice

the logic of the cryptographic design and

get a better sense of what is happening within the black box,

and how and why it is designed that way.

Furthermore, you will be able to analyze

the security strength and properties of cryptographic schemes.

For example, if somebody presents you an algorithm that is overly complex,

then you can follow the logic and evaluate the algorithm to judge

whether the added complexity provides any value to the system.

This actually happened to me when one of my Ph.D.

students wanted to build his own cryptographic algorithm,

with the impression that greater complexity is sufficient for improved security.

In another case, I was in a meeting with people working as

system integrators of government owned critical infrastructure.

And they claimed that their system is so complex that it is

impossible for the attacker to learn and attack the system.

In contrast to what it may seem like,

cryptography research and development is often driven by

simplicity, transparency, and efficiency.

For example, advanced mathematics are used for

simpler descriptions of the cryptographic algorithms.

The algorithm designs are public and

the implementations are efficient for

computer processing and as easy if the key is known.

I'm really excited to launch this MOOC.

And I hope you find it intriguing helpful.

Welcome to applied cryptography.

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