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There are 3 keys embedded in this challenge. They all use the same client and server.

client: https://github.com/openctf/openctf-2015-dc23/blob/master/challange_downloads/blackSmoke_client2f94108a576e927733a74ac309a206f0?raw=true

server: read https://github.com/openctf/openctf-2015-dc23/blob/master/challange_servers/running_black_smoke.md for instructions on setting up the servers

a libc of the correct version is available in https://github.com/openctf/openctf-2015-dc23/tree/master/challange_servers