Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

2bc3c253189cf74b6d1e1d27d5707a21993c471e1516bb2d21406dd83326a110883c82857baf054cd893d0a31fbb5878acabaa6b48facf83f6b926ea3180b617

Ciphertext (hexencoded):

2bc3c253189cf74b6d1e1d27d5707a21 993c471e1516bb2d21406dd83326a110 883c82857baf054cd893d0a31fbb5878 acabaa6b48facf83f6b926ea3180b617

Plaintext (hexencoded):

2bc3c253189cf74b6d1e1d27d5707a21 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

+\xc3\xc2S\x18\x9c\xf7Km\x1e\x1d\'\xd5pz! {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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