Laginimaineb shared huge article about How to extract master keys for full encrypted android device. The article contains a lot of technician information and a python script which can help you do it.
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Relevant resources:
Here is a script for decrypting android devices.
Here is an article “Revisiting Android disk encryption”
Here is an article “Data encryption in Android reviewed their evolution from … – The Free Android”
Here is an article “Full Disk Encryption”