Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

476e826dbc096767150459a32ffc00c5812d9b8189d2e9d21e9d42429535cd580806e7a5ad4c75d9f812c56668284dea07bb162f99c73e270aef14808faa37a1

Ciphertext (hexencoded):

476e826dbc096767150459a32ffc00c5 812d9b8189d2e9d21e9d42429535cd58 0806e7a5ad4c75d9f812c56668284dea 07bb162f99c73e270aef14808faa37a1

Plaintext (hexencoded):

476e826dbc096767150459a32ffc00c5 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

Gn\x82m\xbc\tgg\x15\x04Y\xa3/\xfc\x00\xc5 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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