File: https://storage.googleapis.com/static-39cde13/attachments/23/circular-3077276e7ac169b8ffbfa50d20ad29dd9122e120b626c1660717379272ae16d8.7z Server: https://crypto02.chal.ctf.westerns.tokyo

(Example) $ curl https://crypto02.chal.ctf.westerns.tokyo -d '{"cmd":"pubkey"}'