Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

36d4a336ad8cf0b62a3e3960bdaca7c9935268ebd4c0c19ce5e58d28e97348e756e3afad838f1c83857ac519268a9d9679795de8b76242ca3f55298e9abbc236

Ciphertext (hexencoded):

36d4a336ad8cf0b62a3e3960bdaca7c9 935268ebd4c0c19ce5e58d28e97348e7 56e3afad838f1c83857ac519268a9d96 79795de8b76242ca3f55298e9abbc236

Plaintext (hexencoded):

36d4a336ad8cf0b62a3e3960bdaca7c9 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

6\xd4\xa36\xad\x8c\xf0\xb6*>9`\xbd\xac\xa7\xc9 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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