Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

5437e5b3499f5f1986dc7362ef703594e08ae39ed9f330b9c61cba0676f16de7e75fe73275b4c5413f150feb5ff6f3c2737b07f21af60d9f3f195874230b542d

Ciphertext (hexencoded):

5437e5b3499f5f1986dc7362ef703594 e08ae39ed9f330b9c61cba0676f16de7 e75fe73275b4c5413f150feb5ff6f3c2 737b07f21af60d9f3f195874230b542d

Plaintext (hexencoded):

5437e5b3499f5f1986dc7362ef703594 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

T7\xe5\xb3I\x9f_\x19\x86\xdcsb\xefp5\x94 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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