Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

4f03ff04dc27469a56263e5315f98000ab5d2c297748efed71eec075b89e2464c74ba5324d3cc9e61cbbc7865a4f1b23f489eee2ece6f75015e8ae1aade6a894

Ciphertext (hexencoded):

4f03ff04dc27469a56263e5315f98000 ab5d2c297748efed71eec075b89e2464 c74ba5324d3cc9e61cbbc7865a4f1b23 f489eee2ece6f75015e8ae1aade6a894

Plaintext (hexencoded):

4f03ff04dc27469a56263e5315f98000 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

O\x03\xff\x04\xdc\'F\x9aV&>S\x15\xf9\x80\x00 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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