Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

771a2541d18e8049032e620c527b974a009a17cef471bd70a3c74bb6d3f5e4faeadf9783d6061bca23f452f4097f68f074b917ffb15eb042e416bce2b3d5f08c

Ciphertext (hexencoded):

771a2541d18e8049032e620c527b974a 009a17cef471bd70a3c74bb6d3f5e4fa eadf9783d6061bca23f452f4097f68f0 74b917ffb15eb042e416bce2b3d5f08c

Plaintext (hexencoded):

771a2541d18e8049032e620c527b974a 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

w\x1a%A\xd1\x8e\x80I\x03.b\x0cR{\x97J {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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