Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

43d3cd6c667bd3b103fba1898388910ebb2320ab0f5ae4f033e7392c5bfe514db05e7c82396f91c46a0c24530765c3d0157dfc0708955413de49bc0807f4fb72

Ciphertext (hexencoded):

43d3cd6c667bd3b103fba1898388910e bb2320ab0f5ae4f033e7392c5bfe514d b05e7c82396f91c46a0c24530765c3d0 157dfc0708955413de49bc0807f4fb72

Plaintext (hexencoded):

43d3cd6c667bd3b103fba1898388910e 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

C\xd3\xcdlf{\xd3\xb1\x03\xfb\xa1\x89\x83\x88\x91\x0e {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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