Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

ae910e5e129c31dd928afcaa2de15f1f17b22407f07cb3ae21a1eeffe9452068effd58f02aa40066f4e7db6cbb6eba232e86711dfe18e5bb21024d38ddb1405d

Ciphertext (hexencoded):

ae910e5e129c31dd928afcaa2de15f1f 17b22407f07cb3ae21a1eeffe9452068 effd58f02aa40066f4e7db6cbb6eba23 2e86711dfe18e5bb21024d38ddb1405d

Plaintext (hexencoded):

ae910e5e129c31dd928afcaa2de15f1f 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xae\x91\x0e^\x12\x9c1\xdd\x92\x8a\xfc\xaa-\xe1_\x1f {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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