Block cipher challenge

Level: CBC mode

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Ciphertext (hexencoded), for easy copy-paste

5d5429baf7448665d5536314f07442bd0ff6c6b84088634d955075b1db8f94c0e41baee4602ca2c7c6c2c2a5e2b9be4c04b13efac529b9c6080bab33b7f7e22b

Ciphertext (hexencoded):

5d5429baf7448665d5536314f07442bd 0ff6c6b84088634d955075b1db8f94c0 e41baee4602ca2c7c6c2c2a5e2b9be4c 04b13efac529b9c6080bab33b7f7e22b

Plaintext (hexencoded):

5d5429baf7448665d5536314f07442bd 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

]T)\xba\xf7D\x86e\xd5Sc\x14\xf0tB\xbd {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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