Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

a0e40643c2ce67c8858ccaf75a76f9f07d651d589a6bf3dae4f33b9948c4f28d0d1d9ddeaf4a420e7e0691439b9c53809c158d95ba7b539793211c914be4fb6b

Ciphertext (hexencoded):

a0e40643c2ce67c8858ccaf75a76f9f0 7d651d589a6bf3dae4f33b9948c4f28d 0d1d9ddeaf4a420e7e0691439b9c5380 9c158d95ba7b539793211c914be4fb6b

Plaintext (hexencoded):

a0e40643c2ce67c8858ccaf75a76f9f0 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xa0\xe4\x06C\xc2\xceg\xc8\x85\x8c\xca\xf7Zv\xf9\xf0 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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