Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

6f5859d903c6dbc044d34ef2b3488a5191a3ef385bd4e22125a6459a28fdc7d8a7fe5b98b6ec5443d8bf1aa9477c2793d5ff99987ad7e0bf6cc77c2fa6f9e289

Ciphertext (hexencoded):

6f5859d903c6dbc044d34ef2b3488a51 91a3ef385bd4e22125a6459a28fdc7d8 a7fe5b98b6ec5443d8bf1aa9477c2793 d5ff99987ad7e0bf6cc77c2fa6f9e289

Plaintext (hexencoded):

6f5859d903c6dbc044d34ef2b3488a51 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

oXY\xd9\x03\xc6\xdb\xc0D\xd3N\xf2\xb3H\x8aQ {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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