Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

9688a6c381109f8f6aede4cc001ccef099c9c1b974f1fe98a90eb29932166649fddc55d5bdef48ea5d287d086fef80bc8423339d85ac21b0e61fa125db36673d

Ciphertext (hexencoded):

9688a6c381109f8f6aede4cc001ccef0 99c9c1b974f1fe98a90eb29932166649 fddc55d5bdef48ea5d287d086fef80bc 8423339d85ac21b0e61fa125db36673d

Plaintext (hexencoded):

9688a6c381109f8f6aede4cc001ccef0 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\x96\x88\xa6\xc3\x81\x10\x9f\x8fj\xed\xe4\xcc\x00\x1c\xce\xf0 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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