Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

464e01728c76150acc3b0aa10b579a1cd81a67410f5c31b6ba8a7aa39948ee1e490576c337cc35a3d53568b5f1ead6f715edda56c73a90a14e5e4205dbf76483

Ciphertext (hexencoded):

464e01728c76150acc3b0aa10b579a1c d81a67410f5c31b6ba8a7aa39948ee1e 490576c337cc35a3d53568b5f1ead6f7 15edda56c73a90a14e5e4205dbf76483

Plaintext (hexencoded):

464e01728c76150acc3b0aa10b579a1c 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

FN\x01r\x8cv\x15\n\xcc;\n\xa1\x0bW\x9a\x1c {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

{"username": "guest", "is_guest": true}