Block cipher challenge

Level: CBC mode

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Ciphertext (hexencoded), for easy copy-paste

02302c07c982f84cb5ab187a8625202a4a9bbdfe3bd202cbfbd90fd9455b04161ab1858c0dc42bdec83bdea05326009170b98a372b93987f79caa5c1b26a4f87

Ciphertext (hexencoded):

02302c07c982f84cb5ab187a8625202a 4a9bbdfe3bd202cbfbd90fd9455b0416 1ab1858c0dc42bdec83bdea053260091 70b98a372b93987f79caa5c1b26a4f87

Plaintext (hexencoded):

02302c07c982f84cb5ab187a8625202a 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\x020,\x07\xc9\x82\xf8L\xb5\xab\x18z\x86% * {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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