Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

c3b89c55cd3c63b894e4f21d0f3963de476da06fbdd98e9dffc64db4684cd0ab558a5ffcbb80ddbb6ca8a2d4f19ddb0d8d8919f423a184fe956f6836d5f0ef59

Ciphertext (hexencoded):

c3b89c55cd3c63b894e4f21d0f3963de 476da06fbdd98e9dffc64db4684cd0ab 558a5ffcbb80ddbb6ca8a2d4f19ddb0d 8d8919f423a184fe956f6836d5f0ef59

Plaintext (hexencoded):

c3b89c55cd3c63b894e4f21d0f3963de 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xc3\xb8\x9cU\xcd<c\xb8\x94\xe4\xf2\x1d\x0f9c\xde {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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