Block cipher challenge

Level: CBC mode

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Ciphertext (hexencoded), for easy copy-paste

911b0a48d36c8ad29b1e3b680a987499d172e3b2dc0ffec79f5c973184bedcbb1d9b5482f9ae3ca625f64175508afcf29c4085f6b96309463052cea755f3f9d9

Ciphertext (hexencoded):

911b0a48d36c8ad29b1e3b680a987499 d172e3b2dc0ffec79f5c973184bedcbb 1d9b5482f9ae3ca625f64175508afcf2 9c4085f6b96309463052cea755f3f9d9

Plaintext (hexencoded):

911b0a48d36c8ad29b1e3b680a987499 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\x91\x1b\nH\xd3l\x8a\xd2\x9b\x1e;h\n\x98t\x99 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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