Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

6c8415ca0e2847ccbd3d1f7e1135abfc6195ca038d11b4544995bb258a2146ef753b41f1ab777377b49a2208f843cb2d414d1aabfe1f2846704653cfdcd40113

Ciphertext (hexencoded):

6c8415ca0e2847ccbd3d1f7e1135abfc 6195ca038d11b4544995bb258a2146ef 753b41f1ab777377b49a2208f843cb2d 414d1aabfe1f2846704653cfdcd40113

Plaintext (hexencoded):

6c8415ca0e2847ccbd3d1f7e1135abfc 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

l\x84\x15\xca\x0e(G\xcc\xbd=\x1f~\x115\xab\xfc {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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