Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

027d290601aed70f68ae42b9c88d5855070aa6f6a74befb7d1106c0966231f7f2fb8d2b4b8b519650904ad1b4b36598988448b67a4ca258d1b3c4d289a198cc3

Ciphertext (hexencoded):

027d290601aed70f68ae42b9c88d5855 070aa6f6a74befb7d1106c0966231f7f 2fb8d2b4b8b519650904ad1b4b365989 88448b67a4ca258d1b3c4d289a198cc3

Plaintext (hexencoded):

027d290601aed70f68ae42b9c88d5855 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\x02})\x06\x01\xae\xd7\x0fh\xaeB\xb9\xc8\x8dXU {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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