Startup failure, unable to decrypt ibdata1

After upgrading from an older 5.5 release and implementing Data At Rest Encryption, then proceeding to convert a lot of myisam tables over to innodb, the following errors are now reported when starting the mariadb service.

[ERROR] InnoDB: The page [page id: space=0, page number=7] in file './ibdata1' cannot be decrypted.
[Note] InnoDB: However key management plugin or used key_version 1 is not found or used encryption algorithm or method does not match.
[ERROR] [FATAL] InnoDB: Aborting because of a corrupt database page.

(See attached error_output.txt for full startup log detail)

The entire upgrade process did work smoothly, until the point I restarted the mariadb service.

The upgrade process went through the following stages.
1: Update mariadb via yum using the mariadb repo.
2: Rework config files due to path changes and start mariadb
3: Stop database, add in encryption configuration and start again.
4: Run sql query to convert tables from myisam to innodb.

# mysql dev_cms -e "show table status where Engine='MyISAM';" | awk 'NR>1

' |mysql dev_cms

5: Test and verify that encryption is working.
6: Stop and restart mariadb - Fault occurs on startup.

I've referenced two other issues which appear to be the same problem, however they're both listed and fixed in the 10.1 branch not 10.2

I don't have, but can probably generate more data if required.