This is just a really difficult challenge. First, decompile
snapchat.apk using a tool or a service like decompileandroid. Extact the
src folder. Yay. Java.
The first step is to do a little bit of research on Snapchat decryption. Your research will probably lead you to this repo. However, it's outdated. Cry slowly. You should realize at this point that you need the Android ID to do anything. Use grep to search for
android_id in src. This will reveal locations in the code that obtain the Android ID from the phone. You will eventually find in
com.flurry.sdk.ea the following: