Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

b02799cedfb4c0605234b5f856d8db063c6b283bd57dc1365fa9be6ebf3c4cfd3f3777be0c6419c9af153968a8c262fc4ac7f1e5be701d4e7bfd147ab35c5a12

Ciphertext (hexencoded):

b02799cedfb4c0605234b5f856d8db06 3c6b283bd57dc1365fa9be6ebf3c4cfd 3f3777be0c6419c9af153968a8c262fc 4ac7f1e5be701d4e7bfd147ab35c5a12

Plaintext (hexencoded):

b02799cedfb4c0605234b5f856d8db06 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xb0\'\x99\xce\xdf\xb4\xc0`R4\xb5\xf8V\xd8\xdb\x06 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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