Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

63a195f068f6a24af80a33215a77b86a16776f9e62dfa5f278acbc9c7e7603c5b6727a1cc1da7aeeaea5561a5e0814b6bd6d939ab5375b905890a074ce4411f1

Ciphertext (hexencoded):

63a195f068f6a24af80a33215a77b86a 16776f9e62dfa5f278acbc9c7e7603c5 b6727a1cc1da7aeeaea5561a5e0814b6 bd6d939ab5375b905890a074ce4411f1

Plaintext (hexencoded):

63a195f068f6a24af80a33215a77b86a 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

c\xa1\x95\xf0h\xf6\xa2J\xf8\n3!Zw\xb8j {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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