Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

c449420a07e475bc5ef2d0838203dd9fa01bf2d46f61871b043ed708c4983b8216578ba8aed465fe94e1ec880cda4870675f58221fa98766c130468abae0eca3

Ciphertext (hexencoded):

c449420a07e475bc5ef2d0838203dd9f a01bf2d46f61871b043ed708c4983b82 16578ba8aed465fe94e1ec880cda4870 675f58221fa98766c130468abae0eca3

Plaintext (hexencoded):

c449420a07e475bc5ef2d0838203dd9f 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xc4IB\n\x07\xe4u\xbc^\xf2\xd0\x83\x82\x03\xdd\x9f {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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