You can decrypt all game files with
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by
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.
To encrypt them back, download the encryption tool I created(
for my own use since it's not available yet in GUI) which needs to be placed in the same directory as
RPG Maker MV Decrypter.jar and ran with administrator privilege.
If you're using the default location for encryption, you need to manually add the key yourself which you can find at "
Karryn's Prison\www\data\System.json" under "
encryptionKey" which should be "
3b7a201a3e379fd9a7cf969ae6a4981d".
OR, if you want a better online-tool than what
Euclita suggested, try
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which can handle batch work for both decryption & encryption.