Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

506c7c41a1c2af8a8c06c086a4fb99f5369d0eca79ea5a34668417f4b2ae2f900b3c78d6fec5b8fcb5b9e396b450fe32920e71ba136a01f4f7df0a05c8a4eeeb

Ciphertext (hexencoded):

506c7c41a1c2af8a8c06c086a4fb99f5 369d0eca79ea5a34668417f4b2ae2f90 0b3c78d6fec5b8fcb5b9e396b450fe32 920e71ba136a01f4f7df0a05c8a4eeeb

Plaintext (hexencoded):

506c7c41a1c2af8a8c06c086a4fb99f5 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

Pl|A\xa1\xc2\xaf\x8a\x8c\x06\xc0\x86\xa4\xfb\x99\xf5 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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