Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

07e32475e5c16fd9aa6e9437a38f6e4e078dde203bf8456919cb21d62027f2535211e409c7135aad9254f1e86811a8e8dfbb34c2edf2a778f5793608da3672c6

Ciphertext (hexencoded):

07e32475e5c16fd9aa6e9437a38f6e4e 078dde203bf8456919cb21d62027f253 5211e409c7135aad9254f1e86811a8e8 dfbb34c2edf2a778f5793608da3672c6

Plaintext (hexencoded):

07e32475e5c16fd9aa6e9437a38f6e4e 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\x07\xe3$u\xe5\xc1o\xd9\xaan\x947\xa3\x8fnN {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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