Block cipher challenge

Level: CBC mode

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Ciphertext (hexencoded), for easy copy-paste

31ba4141d68e5420b069345243b22e88f00fe319d6ae1fd1877fc7eb0085fcb445b901ddcfa704835b78ec2bf324141f59272f12dd44b194089a3f2efa391931

Ciphertext (hexencoded):

31ba4141d68e5420b069345243b22e88 f00fe319d6ae1fd1877fc7eb0085fcb4 45b901ddcfa704835b78ec2bf324141f 59272f12dd44b194089a3f2efa391931

Plaintext (hexencoded):

31ba4141d68e5420b069345243b22e88 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

1\xbaAA\xd6\x8eT \xb0i4RC\xb2.\x88 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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