Encryption in Android

You know about the most pressing security risks your app faces and how to address those risks. You can now learn how to use the one control that protects data better than any other: encryption.

Course description

When considering a multilayer strategy for protecting user data, you should always start with the data itself. Encryption protects data whether it is at rest, in transit or in use. In this course, you will learn about the Android file system, how and where data can be saved and how to protect that data wherever it is found. You will examine a common mistake developers make when handling user credentials and other secrets. You will learn how to encrypt and validate user credentials in your app, ensuring that at an app level they are difficult to compromise. You will then learn how to leverage Android Keystore to safely store and retrieve credentials.


Android storage overview

Video — 00:09:25

In this lesson, we examine Android storage, the Android directory structure and where user data is saved.

Understanding PKI

Video — 00:10:17

In this lesson, we learn about the public-key infrastructure and how to obtain a certificate to sign and publish your app on Google Play.

Encryption overview

Video — 00:11:48

In this lesson, we learn about basic encryption concepts.

Protecting secrets

Video — 00:13:05

In this lesson, we learn what secrets are and different ways to save and retrieve them.

Activity: Insecurely saving a username and password

Video — 00:10:05

In this activity, we save a username and password in an easy but insecure way.

Android encryption overview

Video — 00:13:55

In this lesson, we learn how to perform symmetric and asymmetric encryption in Kotlin.

Activity: Encrypting data

Video — 00:13:31

In this activity, we implement symmetric encryption in an app.

Activity: Encrypting data, Part 2

Video — 00:11:21

We continue with our implementation of symmetric encryption.

Activity: Encrypting data, Part 3 – Examining the UI and database classes

Video — 00:12:53

We conclude our implementation of symmetric encryption by examining peripheral classes that helped make our encryption app possible.


Video — 00:08:08

In this lesson, we learn about hashing and random number generators.

Activity: Salting a hashed password

Video — 00:05:51

In this activity, we use a salt to further protect our hashed password in our app.

Activity: Hashing a password

Video — 00:09:26

In this activity, we practice hashing a password in our app.

Activity: Generating random values

Video — 00:03:52

In this activity, we practice generating random values for hashing.

Android Keystore

Video — 00:05:46

In this lesson, we learn about Android Keystore.

Activity: Storing secrets in Android Keystore

Video — 00:12:15

In this activity, we implement Android Keystore.

Meet the author

Chrys Thorsen is a technology and education consultant with 25 years of experience. Her work has taken her around the U.S. and overseas, including as a contractor for the CDC using technology to help fight HIV/AIDS in Africa.

During her career, she has acquired 40 IT certifications, authored over 25 textbooks on a wide range of IT subjects, including secure iOS and Android coding, and created an equal number of IT-related video courses. When not working, Chrys enjoys reading scientific articles and experimenting with Internet-of-Things devices. She currently lives in Virginia with her sister, her cat and her dog which, as she describes it, “have the worst sibling rivalry imaginable.”

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