Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

32012f89b1a105379427ecf2357d99506cbbb406a5e0415f9df9b5a93ebb2fd432efa8d350c85382ea8105337f1665a27a06d8808b6894e3bf39267cae106fa5

Ciphertext (hexencoded):

32012f89b1a105379427ecf2357d9950 6cbbb406a5e0415f9df9b5a93ebb2fd4 32efa8d350c85382ea8105337f1665a2 7a06d8808b6894e3bf39267cae106fa5

Plaintext (hexencoded):

32012f89b1a105379427ecf2357d9950 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

2\x01/\x89\xb1\xa1\x057\x94\'\xec\xf25}\x99P {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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