Sadly, I do not know the answers to your questions. The only people who do know are the ransomware writers. You may want to follow these sites to see if anyone has broken the spora encryption yet:
https://heimdalsecurity.com/blog/ransomware-decryption-tools/?utm_source=The+Daily+Security+Tip&utm_campaign=e1a5703189-The_Daily_Security_Tip&utm_medium=email&utm_term=0_276b204e66-e1a5703189-197241985&goal=0_276b204e66-e1a5703189-197241985
https://www.bleepingcomputer.com/forums/f/239/ransomware-help-tech-support/