Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

030ced443b86437dca8afdd1da9ade0d78612bad4e39c282f5f10659f979fa234655830dd3b08cc840b5e41ebfc9b3413a1ceccffd8092b827929a23bc656c12

Ciphertext (hexencoded):

030ced443b86437dca8afdd1da9ade0d 78612bad4e39c282f5f10659f979fa23 4655830dd3b08cc840b5e41ebfc9b341 3a1ceccffd8092b827929a23bc656c12

Plaintext (hexencoded):

030ced443b86437dca8afdd1da9ade0d 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\x03\x0c\xedD;\x86C}\xca\x8a\xfd\xd1\xda\x9a\xde\r {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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