Block cipher challenge

Level: CBC mode

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Ciphertext (hexencoded), for easy copy-paste

c7369c24bbfca4603b5b2767038edc50e691f9f335a7767d90424525f56b35c3e9b9b61741a961684cc5bb1a7977908e8ef71db1bae23b3e1e1488bbb4d3e714

Ciphertext (hexencoded):

c7369c24bbfca4603b5b2767038edc50 e691f9f335a7767d90424525f56b35c3 e9b9b61741a961684cc5bb1a7977908e 8ef71db1bae23b3e1e1488bbb4d3e714

Plaintext (hexencoded):

c7369c24bbfca4603b5b2767038edc50 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xc76\x9c$\xbb\xfc\xa4`;[\'g\x03\x8e\xdcP {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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