Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

d30272ae30fdf19efdf3076d90b1315c6e3f79e4406614c44ef134850c8a66d58506801d16f32135e2d2f8d6b1e564445c63046f9ba873aaae3b1c760eeca291

Ciphertext (hexencoded):

d30272ae30fdf19efdf3076d90b1315c 6e3f79e4406614c44ef134850c8a66d5 8506801d16f32135e2d2f8d6b1e56444 5c63046f9ba873aaae3b1c760eeca291

Plaintext (hexencoded):

d30272ae30fdf19efdf3076d90b1315c 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xd3\x02r\xae0\xfd\xf1\x9e\xfd\xf3\x07m\x90\xb11\\ {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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