Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

f42330d29d6d537156b31dc1f4cc4a2b17183eba33ed003af81f0ac1b81046928fb68d6f56d0fb6b4133e5cc41478f8204e0dbc76e4aaddbef0598d77ac22014

Ciphertext (hexencoded):

f42330d29d6d537156b31dc1f4cc4a2b 17183eba33ed003af81f0ac1b8104692 8fb68d6f56d0fb6b4133e5cc41478f82 04e0dbc76e4aaddbef0598d77ac22014

Plaintext (hexencoded):

f42330d29d6d537156b31dc1f4cc4a2b 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xf4#0\xd2\x9dmSqV\xb3\x1d\xc1\xf4\xccJ+ {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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