Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

b5e60c982ee5e910fe79b597442e1bc61aba5c56bffc15bb11cfe5eeb0d3f7a1befa5e470e7246f213d63a14653b03784043dc1fc37d17d9e60865c06576c1f3

Ciphertext (hexencoded):

b5e60c982ee5e910fe79b597442e1bc6 1aba5c56bffc15bb11cfe5eeb0d3f7a1 befa5e470e7246f213d63a14653b0378 4043dc1fc37d17d9e60865c06576c1f3

Plaintext (hexencoded):

b5e60c982ee5e910fe79b597442e1bc6 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xb5\xe6\x0c\x98.\xe5\xe9\x10\xfey\xb5\x97D.\x1b\xc6 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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