Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

be3870f6b95ffd390c34b8b1a2396c11332db73587512cc18f0c6b433c6b266070054af69ebb765ca024402fa18871432d258518a34dfd7b23bf67e88f443c3b

Ciphertext (hexencoded):

be3870f6b95ffd390c34b8b1a2396c11 332db73587512cc18f0c6b433c6b2660 70054af69ebb765ca024402fa1887143 2d258518a34dfd7b23bf67e88f443c3b

Plaintext (hexencoded):

be3870f6b95ffd390c34b8b1a2396c11 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xbe8p\xf6\xb9_\xfd9\x0c4\xb8\xb1\xa29l\x11 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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