I don't remember my android debug.keystore password

Solution 1:

Usually the debug.keystore password is just "android".

You can delete it and Eclipse will automatically generate a new one, as described here.

Solution 2:

The Default Configuration of debug.keystore file:

Keystore name: "debug.keystore"
Keystore password: "android"
Key alias: "androiddebugkey"
Key password: "android"
CN: "CN=Android Debug,O=Android,C=US"

Where is this file located?

For Windows users: C:\Users\[username]\.android\debug.keystore

For macOS users: ~/.android/debug.keystore

You can get the SHA1 by using the following command:

keytool -list -v -keystore "C:\Users\[username]\.android\debug.keystore" -alias androiddebugkey -storepass android -keypass android

Note: The above answer has just information of Android Studio's default configuration to access the debug.keystore (debug certificate). You can make a custom certificate if you want to use your own password or configuration.

Solution 3:

If you are not certain that the password has been set before, try just empty password. It worked for me.