Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

22d2f2959b46b100e2f7ed14fe057bb6bb242d11fb6b6843bcde5263de40beb6fd2ce9b7750553bfa8b560d81c4183fb65769b1b8bef3fdf12c7854e4af1ebb3

Ciphertext (hexencoded):

22d2f2959b46b100e2f7ed14fe057bb6 bb242d11fb6b6843bcde5263de40beb6 fd2ce9b7750553bfa8b560d81c4183fb 65769b1b8bef3fdf12c7854e4af1ebb3

Plaintext (hexencoded):

22d2f2959b46b100e2f7ed14fe057bb6 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

"\xd2\xf2\x95\x9bF\xb1\x00\xe2\xf7\xed\x14\xfe\x05{\xb6 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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