Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

fb07a1aaff3dfc9839c372b5793d5d7ec841dd58e62e8144c2fda722b486aec06cc738734f4b4fd5ac6c15dff4db23c8ce1b894e68b15e04acc6addbf040b521

Ciphertext (hexencoded):

fb07a1aaff3dfc9839c372b5793d5d7e c841dd58e62e8144c2fda722b486aec0 6cc738734f4b4fd5ac6c15dff4db23c8 ce1b894e68b15e04acc6addbf040b521

Plaintext (hexencoded):

fb07a1aaff3dfc9839c372b5793d5d7e 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xfb\x07\xa1\xaa\xff=\xfc\x989\xc3r\xb5y=]~ {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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