Block cipher challenge

Level: CBC mode

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Ciphertext (hexencoded), for easy copy-paste

5657caa78998c9fd75df645a5bef624f8d804b8d6a800eed79f3f510fb8ff386a72c07612b8b0042e7bc5a647ea5d8f868d96add9168e7acd1a330555d5d508e

Ciphertext (hexencoded):

5657caa78998c9fd75df645a5bef624f 8d804b8d6a800eed79f3f510fb8ff386 a72c07612b8b0042e7bc5a647ea5d8f8 68d96add9168e7acd1a330555d5d508e

Plaintext (hexencoded):

5657caa78998c9fd75df645a5bef624f 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

VW\xca\xa7\x89\x98\xc9\xfdu\xdfdZ[\xefbO {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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