Block cipher challenge

Level: CBC mode

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Ciphertext (hexencoded), for easy copy-paste

9a51516eb3ab14d44b70a2b89e0887c44fa5181bd4211e37575dbd61aaae8a4b917c5e7ca35f510d1d77eacfd0c67addb7ef80966299e0a927e573cc2d3a394a

Ciphertext (hexencoded):

9a51516eb3ab14d44b70a2b89e0887c4 4fa5181bd4211e37575dbd61aaae8a4b 917c5e7ca35f510d1d77eacfd0c67add b7ef80966299e0a927e573cc2d3a394a

Plaintext (hexencoded):

9a51516eb3ab14d44b70a2b89e0887c4 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\x9aQQn\xb3\xab\x14\xd4Kp\xa2\xb8\x9e\x08\x87\xc4 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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