Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

a0343ee2f9504c9bb16aa8ffc52fb5acd5f03a20a106ac376e5d988e5ee09b57562230f5fcfbac7ec609c813ddf018cb8bbc780e566f659d1ef0121d394376bb

Ciphertext (hexencoded):

a0343ee2f9504c9bb16aa8ffc52fb5ac d5f03a20a106ac376e5d988e5ee09b57 562230f5fcfbac7ec609c813ddf018cb 8bbc780e566f659d1ef0121d394376bb

Plaintext (hexencoded):

a0343ee2f9504c9bb16aa8ffc52fb5ac 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xa04>\xe2\xf9PL\x9b\xb1j\xa8\xff\xc5/\xb5\xac {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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