Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

30cc29e883e34285bd7f1ab0173906978888dd0bec9ac1f0d2fed3d773a04e895ddf54dc3bc69280564393302cbc183d486d74bf25d9a38526727150d2ab948d

Ciphertext (hexencoded):

30cc29e883e34285bd7f1ab017390697 8888dd0bec9ac1f0d2fed3d773a04e89 5ddf54dc3bc69280564393302cbc183d 486d74bf25d9a38526727150d2ab948d

Plaintext (hexencoded):

30cc29e883e34285bd7f1ab017390697 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

0\xcc)\xe8\x83\xe3B\x85\xbd\x7f\x1a\xb0\x179\x06\x97 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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