Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

ce4d8ba58e8685271962af24d78339b3203b5704b0636708d712da52735d136e32e65d5b56752a80c949087d0f969665db60f017d98ac1c00caaff68bafbf0c7

Ciphertext (hexencoded):

ce4d8ba58e8685271962af24d78339b3 203b5704b0636708d712da52735d136e 32e65d5b56752a80c949087d0f969665 db60f017d98ac1c00caaff68bafbf0c7

Plaintext (hexencoded):

ce4d8ba58e8685271962af24d78339b3 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xceM\x8b\xa5\x8e\x86\x85\'\x19b\xaf$\xd7\x839\xb3 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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