Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

93b53ee6f8c3abd53b797857664d0f3729dceeebe87b1ac471ccabc42de8341d854c4c2458ce5b37b0048ead656747e25dbd50132802fde35f07a17e533dedf9

Ciphertext (hexencoded):

93b53ee6f8c3abd53b797857664d0f37 29dceeebe87b1ac471ccabc42de8341d 854c4c2458ce5b37b0048ead656747e2 5dbd50132802fde35f07a17e533dedf9

Plaintext (hexencoded):

93b53ee6f8c3abd53b797857664d0f37 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\x93\xb5>\xe6\xf8\xc3\xab\xd5;yxWfM\x0f7 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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