Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

c719678bd979e753208de36e5ce3e5fd5746a43e49161bea61b2859461666122e1cac4ae4ee255468d897e9a851c26530483f3cd6853d2bcbf22e9cc3c669d4f

Ciphertext (hexencoded):

c719678bd979e753208de36e5ce3e5fd 5746a43e49161bea61b2859461666122 e1cac4ae4ee255468d897e9a851c2653 0483f3cd6853d2bcbf22e9cc3c669d4f

Plaintext (hexencoded):

c719678bd979e753208de36e5ce3e5fd 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xc7\x19g\x8b\xd9y\xe7S \x8d\xe3n\\\xe3\xe5\xfd {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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