Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

d8f10797c77fb6385d2c2223d3c0278ff5a1e91f581be6f65025592758441dd78fab82dd249ba8f6638eeb2b7011a5d3001c6286477494785b95d3188e737812

Ciphertext (hexencoded):

d8f10797c77fb6385d2c2223d3c0278f f5a1e91f581be6f65025592758441dd7 8fab82dd249ba8f6638eeb2b7011a5d3 001c6286477494785b95d3188e737812

Plaintext (hexencoded):

d8f10797c77fb6385d2c2223d3c0278f 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xd8\xf1\x07\x97\xc7\x7f\xb68],"#\xd3\xc0\'\x8f {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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