Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

5894f95af00b52a65c2aa939822032af0bd16a9041b4e25db7f262bec8c95a21786c3bed8b60c2edcabd4d06744016577a1c1b40d23c6c7e8b6b2fd23c2e19fd

Ciphertext (hexencoded):

5894f95af00b52a65c2aa939822032af 0bd16a9041b4e25db7f262bec8c95a21 786c3bed8b60c2edcabd4d0674401657 7a1c1b40d23c6c7e8b6b2fd23c2e19fd

Plaintext (hexencoded):

5894f95af00b52a65c2aa939822032af 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

X\x94\xf9Z\xf0\x0bR\xa6\\*\xa99\x82 2\xaf {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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