Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

129c634cf4e86dd373dd58270f1366b73e3789ef5ae5c1aa174cc5f9ee91f73f4bb34d00309ce92bbe39b64b9d130ce49a57ad883e9cd783e3ce07d432ef4869

Ciphertext (hexencoded):

129c634cf4e86dd373dd58270f1366b7 3e3789ef5ae5c1aa174cc5f9ee91f73f 4bb34d00309ce92bbe39b64b9d130ce4 9a57ad883e9cd783e3ce07d432ef4869

Plaintext (hexencoded):

129c634cf4e86dd373dd58270f1366b7 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\x12\x9ccL\xf4\xe8m\xd3s\xddX\'\x0f\x13f\xb7 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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