Google Android Studio includes a tool to create a new key in the Generate Signed Bundle or APK wizard but here's how you can encode and decode your own key that is used to encrypt and decrypt your Google Android Playstore app package before deploying
Encoding
Step 1
openssl base64 < akadenia.jks | tr -d '\n' | tee akadenia.jks.base64.txt
Step 2
openssl enc -base64 -in key.jks -out signing_key.b64 | tr -d '\n' | tee akadenia.jks.base64.txt
Decoding
openssl enc -d -base64 -in signing_key.b64 -out akadenia.jks
This is not something you would run into every day but on the off chance that your team or client requires some custom certificate to encode and decode your Google Android Playstore app then you'll find these steps useful.