Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

6d78a965edc94585b69aa581ebd2245de90c29917a81a5e718d2bb59109e80863afdb260414f7b532c7f5b3554a93f01ff6514e0c036222bf0083ab9a559df8c

Ciphertext (hexencoded):

6d78a965edc94585b69aa581ebd2245d e90c29917a81a5e718d2bb59109e8086 3afdb260414f7b532c7f5b3554a93f01 ff6514e0c036222bf0083ab9a559df8c

Plaintext (hexencoded):

6d78a965edc94585b69aa581ebd2245d 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

mx\xa9e\xed\xc9E\x85\xb6\x9a\xa5\x81\xeb\xd2$] {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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