[8] : gsilvis counting magic - 9 - 5 solves : crypto: Here's a verification/decryption server:  gcm.ctf.bostonkey.party:32768 .  Get the GCM MAC key (the thing the server prints out on startup).  We've given you one valid ciphertext to get you started.  It has  iv: [102 97 110 116 97 115 116 105 99 32 105 118] and tag: [119 179] https://s3.amazonaws.com/bostonkeyparty/2016/a8730f449f0c6b985790fb4df3ebae4c01556648.tar