Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

b909dd48434f421d265986468efce9d691843bdaf5fafd7de3fa1ddd6fa10971c60398103aea03c6921399757ffc18d1eb8695ebf09db84f5605964d56bb68d0

Ciphertext (hexencoded):

b909dd48434f421d265986468efce9d6 91843bdaf5fafd7de3fa1ddd6fa10971 c60398103aea03c6921399757ffc18d1 eb8695ebf09db84f5605964d56bb68d0

Plaintext (hexencoded):

b909dd48434f421d265986468efce9d6 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xb9\t\xddHCOB\x1d&Y\x86F\x8e\xfc\xe9\xd6 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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