Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

bc6597a757e4033efa43042757ccbb915a0b6e41e6a35751c722745f292d5b7f42636a8e1336ccaa76e9303db2e9534c52a799da669207e90cb46ef04386ac06

Ciphertext (hexencoded):

bc6597a757e4033efa43042757ccbb91 5a0b6e41e6a35751c722745f292d5b7f 42636a8e1336ccaa76e9303db2e9534c 52a799da669207e90cb46ef04386ac06

Plaintext (hexencoded):

bc6597a757e4033efa43042757ccbb91 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xbce\x97\xa7W\xe4\x03>\xfaC\x04\'W\xcc\xbb\x91 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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