Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

aa479021600add7e70bd40d7cd3c1a5f2f9729617b50f96740bd179db7f3be2ae280ac53ce9616abd93775de7777a8e80cb4da3fa402956db18ed6b3ea6e6d12

Ciphertext (hexencoded):

aa479021600add7e70bd40d7cd3c1a5f 2f9729617b50f96740bd179db7f3be2a e280ac53ce9616abd93775de7777a8e8 0cb4da3fa402956db18ed6b3ea6e6d12

Plaintext (hexencoded):

aa479021600add7e70bd40d7cd3c1a5f 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xaaG\x90!`\n\xdd~p\xbd@\xd7\xcd<\x1a_ {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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