Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

3e16072eb54e91791d242aa7ee1d01d43b148a538625b40466275aa5a01249b45a4bbe43ea5a0530d3c70957a5c1515bc5dc85d7e29eb746b838d5bc7a1d093b

Ciphertext (hexencoded):

3e16072eb54e91791d242aa7ee1d01d4 3b148a538625b40466275aa5a01249b4 5a4bbe43ea5a0530d3c70957a5c1515b c5dc85d7e29eb746b838d5bc7a1d093b

Plaintext (hexencoded):

3e16072eb54e91791d242aa7ee1d01d4 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

>\x16\x07.\xb5N\x91y\x1d$*\xa7\xee\x1d\x01\xd4 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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