Block cipher challenge

Level: CBC mode

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Ciphertext (hexencoded), for easy copy-paste

c866a2d3d73b14e6097af76d6b19f116f98488d1bad2aa35992da01be7ec1323fa74842624aa999deb6d06768ac6102ccaaf5d26766da10af354eb9f15acb111

Ciphertext (hexencoded):

c866a2d3d73b14e6097af76d6b19f116 f98488d1bad2aa35992da01be7ec1323 fa74842624aa999deb6d06768ac6102c caaf5d26766da10af354eb9f15acb111

Plaintext (hexencoded):

c866a2d3d73b14e6097af76d6b19f116 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xc8f\xa2\xd3\xd7;\x14\xe6\tz\xf7mk\x19\xf1\x16 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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