Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

1679bc37667d6cc347310c0f36ed2067d8ee2366cd97abc4fcb7486aa81464744c77da28f8798e9707b208e432681bfd7cb5d9787f47f7396a89980ebdf1585b

Ciphertext (hexencoded):

1679bc37667d6cc347310c0f36ed2067 d8ee2366cd97abc4fcb7486aa8146474 4c77da28f8798e9707b208e432681bfd 7cb5d9787f47f7396a89980ebdf1585b

Plaintext (hexencoded):

1679bc37667d6cc347310c0f36ed2067 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\x16y\xbc7f}l\xc3G1\x0c\x0f6\xed g {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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