START_ENCRYPTION event
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The START_ENCRYPTION event is written in every binary log file if 'encrypt_binlog' is set to ON in my.cnf, since MariaDB version 10.1.7
This event is written just once and after The Format Description event, which is the first event of a binlog file.
The event has the 19 bytes event header with EventType set to value 164 (0xa4) + 17 bytes
The event payload is:
Note: the Nonce 12 bytes + the binlog event current pos uint<4> form the encrryption IV (16 bytes) for the event.
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