$ cat etc/artemis-users.properties | grep admin
admin = foobar

$ bin/artemis queue stat --user admin --password 'foobar' --url tcp://localhost:61616
Connection brokerURL = tcp://localhost:61616
//works

$ bin/artemis mask foobar
result: 30cae6f5d5200a86

$ bin/artemis queue stat --user admin --password "ENC(30cae6f5d5200a86)" --url tcp://localhost:61616
Connection brokerURL = tcp://localhost:61616
Exception in thread "main" ActiveMQSecurityException[errorType=SECURITY_EXCEPTION message=AMQ229031: Unable to validate user from /127.0.0.1:35946. Username: admin; SSL certificate subject DN: unavailable]