Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

924cfccf73d561c876b7a6e1132e74fb452eebafef6b3167af59624e666170001a178a1f84b279c3ae639164add27389e6a68793ed83d184d9f47b6fd23f33bd

Ciphertext (hexencoded):

924cfccf73d561c876b7a6e1132e74fb 452eebafef6b3167af59624e66617000 1a178a1f84b279c3ae639164add27389 e6a68793ed83d184d9f47b6fd23f33bd

Plaintext (hexencoded):

924cfccf73d561c876b7a6e1132e74fb 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\x92L\xfc\xcfs\xd5a\xc8v\xb7\xa6\xe1\x13.t\xfb {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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