Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

ef4e3a45fa609af80570d94851642080fe7dd92c8f7e016d4a27953157f37fd1f6ba38f5132103be8f843f6c17f8d2ae1f99620f692ba72446a9a149ae1309df

Ciphertext (hexencoded):

ef4e3a45fa609af80570d94851642080 fe7dd92c8f7e016d4a27953157f37fd1 f6ba38f5132103be8f843f6c17f8d2ae 1f99620f692ba72446a9a149ae1309df

Plaintext (hexencoded):

ef4e3a45fa609af80570d94851642080 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xefN:E\xfa`\x9a\xf8\x05p\xd9HQd \x80 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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