Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

308eff96dc212a4ff37ec3cf6428bbd3e311468fd25ab1af8aeeb36a42a65baba4fae9c51ac9a3ba9b8ba188dffe681f9968265329bb86027dc99df99d30cca0

Ciphertext (hexencoded):

308eff96dc212a4ff37ec3cf6428bbd3 e311468fd25ab1af8aeeb36a42a65bab a4fae9c51ac9a3ba9b8ba188dffe681f 9968265329bb86027dc99df99d30cca0

Plaintext (hexencoded):

308eff96dc212a4ff37ec3cf6428bbd3 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

0\x8e\xff\x96\xdc!*O\xf3~\xc3\xcfd(\xbb\xd3 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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