Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

7e3dacf20a5512e1811f1b46155d79bfb4a478e318a0308bd9cf5028003209327a478523520bdf01bb1482692eb09109c9473c8c4f1839ae7718c32a8ea2b04a

Ciphertext (hexencoded):

7e3dacf20a5512e1811f1b46155d79bf b4a478e318a0308bd9cf502800320932 7a478523520bdf01bb1482692eb09109 c9473c8c4f1839ae7718c32a8ea2b04a

Plaintext (hexencoded):

7e3dacf20a5512e1811f1b46155d79bf 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

~=\xac\xf2\nU\x12\xe1\x81\x1f\x1bF\x15]y\xbf {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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