Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

be07c1e151a8c0e27fad19e63ccf29132391efe90d425d8eea3de379faca94963f62c0ec3acd275b6d1bd4fc58861b73d0cf2249b50950be41308617c765b1fe

Ciphertext (hexencoded):

be07c1e151a8c0e27fad19e63ccf2913 2391efe90d425d8eea3de379faca9496 3f62c0ec3acd275b6d1bd4fc58861b73 d0cf2249b50950be41308617c765b1fe

Plaintext (hexencoded):

be07c1e151a8c0e27fad19e63ccf2913 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xbe\x07\xc1\xe1Q\xa8\xc0\xe2\x7f\xad\x19\xe6<\xcf)\x13 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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