Block cipher challenge

Level: CBC mode

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Ciphertext (hexencoded), for easy copy-paste

d13757b8434806158f70d086f29a8f1f1aba534289826ed7db49f9ebbb3aa64f696f27961dbac98d181315e7c88e8d55d3ebea66b4d1da17a5607c2bff2f3d10

Ciphertext (hexencoded):

d13757b8434806158f70d086f29a8f1f 1aba534289826ed7db49f9ebbb3aa64f 696f27961dbac98d181315e7c88e8d55 d3ebea66b4d1da17a5607c2bff2f3d10

Plaintext (hexencoded):

d13757b8434806158f70d086f29a8f1f 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xd17W\xb8CH\x06\x15\x8fp\xd0\x86\xf2\x9a\x8f\x1f {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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