Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

9ab14e896fd62e60bba77aefba6d37debfe6293d0ef38644af57f0a56e404f97b9822a1b3a317b37ae498d06b7410d1499face64cd25a28a1f91a9004e135fc9

Ciphertext (hexencoded):

9ab14e896fd62e60bba77aefba6d37de bfe6293d0ef38644af57f0a56e404f97 b9822a1b3a317b37ae498d06b7410d14 99face64cd25a28a1f91a9004e135fc9

Plaintext (hexencoded):

9ab14e896fd62e60bba77aefba6d37de 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\x9a\xb1N\x89o\xd6.`\xbb\xa7z\xef\xbam7\xde {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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