Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

f9225016d7b4f02ac8f835224e6a220ce6e339ae40e271a0a5d8919a28ed4bea6afe1b81b9984bfd9b32fa9c4b33ed1461a2701cdb6d7ae66323ea931abdf29f

Ciphertext (hexencoded):

f9225016d7b4f02ac8f835224e6a220c e6e339ae40e271a0a5d8919a28ed4bea 6afe1b81b9984bfd9b32fa9c4b33ed14 61a2701cdb6d7ae66323ea931abdf29f

Plaintext (hexencoded):

f9225016d7b4f02ac8f835224e6a220c 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xf9"P\x16\xd7\xb4\xf0*\xc8\xf85"Nj"\x0c {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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