Block cipher challenge

Level: CBC mode

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Ciphertext (hexencoded), for easy copy-paste

ae9b30789cb6ea3b43f3a8fe7473ef9f1ad40133a7b1d91c0792cffef4ca6a8cc9b4cde976dd3f3a699dff666e1127baa234d22c6cb50c130f47c3a60d6de665

Ciphertext (hexencoded):

ae9b30789cb6ea3b43f3a8fe7473ef9f 1ad40133a7b1d91c0792cffef4ca6a8c c9b4cde976dd3f3a699dff666e1127ba a234d22c6cb50c130f47c3a60d6de665

Plaintext (hexencoded):

ae9b30789cb6ea3b43f3a8fe7473ef9f 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xae\x9b0x\x9c\xb6\xea;C\xf3\xa8\xfets\xef\x9f {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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