Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

9c432879e67f9faf435218afc22ef4a9bd63c265cc21416149f3145674c460c4864c2c988eeeca46d7f12c9a739cfd6937d18eb17f639ddfc8d5fafa7a8d3ac8

Ciphertext (hexencoded):

9c432879e67f9faf435218afc22ef4a9 bd63c265cc21416149f3145674c460c4 864c2c988eeeca46d7f12c9a739cfd69 37d18eb17f639ddfc8d5fafa7a8d3ac8

Plaintext (hexencoded):

9c432879e67f9faf435218afc22ef4a9 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\x9cC(y\xe6\x7f\x9f\xafCR\x18\xaf\xc2.\xf4\xa9 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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