Encryption Course
3 hours, 3 minutes
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 iOS 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. You will then learn how to leverage built-in iOS functionality to safely store and retrieve credentials. You will learn how to validate user credentials in your app, ensuring that at an app level they are difficult to compromise.
Syllabus
Activity: Adding salt to a password hash
Video - 00:09:00
In this activity, we continue with the same app to add randomization (salt) to the password hash.
Activity: Generating random values
Video - 00:09:00
In this activity, we practice using Swift's random(in:) function to create random values and shuffle arrays and sequences.
Activity: Save user secrets in Keychain
Video - 00:09:00
In this activity, securely store a username and password in Keychain and prove that the credentials can no longer be found in a cleartext file.
Activity: Preparing to use Keychain
Video - 00:09:00
In this activity, we prove that our previous method for storing a username and password is completely insecure. We the use CocoaPods to install a popular third-party library "wrapper" in preparation to use Keychain.
Encryption overview, part 2
Video - 00:09:00
In this segment, we learn about the public-key infrastructure and what digital certificates are. We also learn how to use various encryption libraries to encrypt our data.
Encryption overview
Video - 00:14:00
In this segment, we learn cryptography concepts. These include symmetric, asymmetric and hashing algorithms.
Activity: Verifying a username and password, part 2
Video - 00:09:00
In this activity, we continue to validate that our code can retrieve a saved credential.
Activity: Verifying a username and password
Video - 00:12:00
In this activity, we validate that we can retrieve the username and password that we previously saved.
Activity: Saving a username and password
Video - 00:13:00
In this activity, we use an unsafe but commonly used mechanism to store user credentials.
Activity: Preparing for encryption
Video - 00:04:00
In this activity, we use CocoaPods to install a popular third-party cryptographic library into our app.
Activity: Exploring the iOS file system
Video - 00:09:00
In this activity, we examine and browse the file system of an actual jailbroken iPhone. We exploit a common vulnerability to make an unauthorized network connection, hunting for user files we can steal from the device.
Activity: Hashing Passwords
Video - 00:09:00
In this activity, we revisit a previous app to understand how to hash a password.
Hashing
Video - 00:12:00
In this segment, we learn various ways to implement hashing in Swift, including using a random number generator to salt the hash.
KeyChain
Video - 00:09:00
In this segment, we learn how to implement Keychain in Swift, including how to share Keychain data across multiple devices.
Data persistence, part 2
Video - 00:14:00
In this segment, we learn how to use Keychain to safely store secrets in your local device. We also learn various ways to save data to the device's local disk.
Data persistence
Video - 00:13:00
In this segment, we learn what data persistence is, what constitutes sensitive data and how to use Core Data with SQLite to store your data locally.
Core Data
Video - 00:12:00
In this segment, we study the classic iOS storage system, Core Data, including its architecture and components, and how to use it in your app.
iOS Storage overview
Video - 00:08:00
In this segment, we examine the iOS directory structure, including how an app's sandbox relates to the rest of the file system.
Meet the author
Chrys Thorsen
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