Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

e4966f8e8dd527fec80fa333c26bf0ce8023b9ff4b0c16fadb367f8e057c82bf60588692a8b33dbf51c55a066343a91f82a69bf3dfc304d80850402ab50017a6

Ciphertext (hexencoded):

e4966f8e8dd527fec80fa333c26bf0ce 8023b9ff4b0c16fadb367f8e057c82bf 60588692a8b33dbf51c55a066343a91f 82a69bf3dfc304d80850402ab50017a6

Plaintext (hexencoded):

e4966f8e8dd527fec80fa333c26bf0ce 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xe4\x96o\x8e\x8d\xd5\'\xfe\xc8\x0f\xa33\xc2k\xf0\xce {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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