Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

09adf7c9084d9200a67e04cbc540650fd415aec71a78760664ec7c3638e64cf7ed43e6268aaf4f2b0bb086427a1e25688a1863bd43c6a133a8263a358af9562c

Ciphertext (hexencoded):

09adf7c9084d9200a67e04cbc540650f d415aec71a78760664ec7c3638e64cf7 ed43e6268aaf4f2b0bb086427a1e2568 8a1863bd43c6a133a8263a358af9562c

Plaintext (hexencoded):

09adf7c9084d9200a67e04cbc540650f 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\t\xad\xf7\xc9\x08M\x92\x00\xa6~\x04\xcb\xc5@e\x0f {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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