Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

be877716584ad8a79821bbf15d61aabd9fd3e57592dcdb210b9140adc170b2f91649e88286175d23de1fee45baff4f7d9c23d664f0e49183b15731877aa55d01

Ciphertext (hexencoded):

be877716584ad8a79821bbf15d61aabd 9fd3e57592dcdb210b9140adc170b2f9 1649e88286175d23de1fee45baff4f7d 9c23d664f0e49183b15731877aa55d01

Plaintext (hexencoded):

be877716584ad8a79821bbf15d61aabd 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xbe\x87w\x16XJ\xd8\xa7\x98!\xbb\xf1]a\xaa\xbd {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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