Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

8ebffa51f4069f32bb6546fa6e80ad7e25e681c320b667f59ad7f79157aeaa0adbd626a2e9eee4f5f1f56bf1be4a6afdec95e5ff2aaa0d7a15c1362fe5dbc2c4

Ciphertext (hexencoded):

8ebffa51f4069f32bb6546fa6e80ad7e 25e681c320b667f59ad7f79157aeaa0a dbd626a2e9eee4f5f1f56bf1be4a6afd ec95e5ff2aaa0d7a15c1362fe5dbc2c4

Plaintext (hexencoded):

8ebffa51f4069f32bb6546fa6e80ad7e 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\x8e\xbf\xfaQ\xf4\x06\x9f2\xbbeF\xfan\x80\xad~ {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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