Block cipher challenge

Level: CBC mode

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Ciphertext (hexencoded), for easy copy-paste

2a4779667cd6dc921c06d7d6075df9471098d5971c79d8afb21a58657e4b2f432d9a3bd347b22497bf5286df8accd77255eea9ce6957d1ea655f80e5bb99afa6

Ciphertext (hexencoded):

2a4779667cd6dc921c06d7d6075df947 1098d5971c79d8afb21a58657e4b2f43 2d9a3bd347b22497bf5286df8accd772 55eea9ce6957d1ea655f80e5bb99afa6

Plaintext (hexencoded):

2a4779667cd6dc921c06d7d6075df947 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

*Gyf|\xd6\xdc\x92\x1c\x06\xd7\xd6\x07]\xf9G {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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