Block cipher challenge

Level: CBC mode

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Ciphertext (hexencoded), for easy copy-paste

d25d89e2d93401d50a2b1987427dd583b365d80ff16fd3487acfc6382f99a20f401620345da6d4f2811165853224754b379308ecea007d727009df614725b761

Ciphertext (hexencoded):

d25d89e2d93401d50a2b1987427dd583 b365d80ff16fd3487acfc6382f99a20f 401620345da6d4f2811165853224754b 379308ecea007d727009df614725b761

Plaintext (hexencoded):

d25d89e2d93401d50a2b1987427dd583 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xd2]\x89\xe2\xd94\x01\xd5\n+\x19\x87B}\xd5\x83 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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