Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

efe151aaac967c6e13f57321ae826f863b48caccc2a32ab084f018ddf02d938bf3423233f9abf7c29a5f500ec4b4c8fc28f771416ec2cb9d457ee36d938218d4

Ciphertext (hexencoded):

efe151aaac967c6e13f57321ae826f86 3b48caccc2a32ab084f018ddf02d938b f3423233f9abf7c29a5f500ec4b4c8fc 28f771416ec2cb9d457ee36d938218d4

Plaintext (hexencoded):

efe151aaac967c6e13f57321ae826f86 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xef\xe1Q\xaa\xac\x96|n\x13\xf5s!\xae\x82o\x86 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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