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hey guys and welcome back to a new cryptographic android video yes i will do some security related android videos because i realized i dont have that on my channel yet and security is of course very important and most of these security related videos will in the end deal with data so in the end encrypting and decrypting data that is also what we will start with today so you will learn how you can actually encrypt a string in android how you can decrypt it you will learn about the android keystore system what that is and how we can actually use it to safely save our keys so just a quick demo here what we will actually build and that is a very simple app where we can enter some kind of string in our text field here and we can then encrypt that and decrypt that so for example hello youtube we can say encrypt you can see that is our encrypted string of course not readable for us if we then close our app we reopen it and now click decrypt we will actually decrypt our saved string so we get