Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

2dcb743abfdc4c86d8bcc6e2632d1099eb7fc31068327ed120264832a165f3cd7701d95a8d8944b469565d17c316ec0d56415c4c8cb8e7e90dc6379e37a2a74d

Ciphertext (hexencoded):

2dcb743abfdc4c86d8bcc6e2632d1099 eb7fc31068327ed120264832a165f3cd 7701d95a8d8944b469565d17c316ec0d 56415c4c8cb8e7e90dc6379e37a2a74d

Plaintext (hexencoded):

2dcb743abfdc4c86d8bcc6e2632d1099 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

-\xcbt:\xbf\xdcL\x86\xd8\xbc\xc6\xe2c-\x10\x99 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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