Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

1aa3a91ed6361bc2cb9ad5d103cd9ae63304b0c9604bc5bd4a6eb84fd82af191bc801770280d147623c7ffc4ab19160ec96556005e1659d54db6f4cb71902228

Ciphertext (hexencoded):

1aa3a91ed6361bc2cb9ad5d103cd9ae6 3304b0c9604bc5bd4a6eb84fd82af191 bc801770280d147623c7ffc4ab19160e c96556005e1659d54db6f4cb71902228

Plaintext (hexencoded):

1aa3a91ed6361bc2cb9ad5d103cd9ae6 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\x1a\xa3\xa9\x1e\xd66\x1b\xc2\xcb\x9a\xd5\xd1\x03\xcd\x9a\xe6 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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