Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

d20b88b551fa67759538d54f93570dc46849ab9182675738315525b231cdf2f4d78fb25f3bc5bf43a5843edadc48701ed1da37ca864d9547dbf6dc4b60f83db0

Ciphertext (hexencoded):

d20b88b551fa67759538d54f93570dc4 6849ab9182675738315525b231cdf2f4 d78fb25f3bc5bf43a5843edadc48701e d1da37ca864d9547dbf6dc4b60f83db0

Plaintext (hexencoded):

d20b88b551fa67759538d54f93570dc4 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xd2\x0b\x88\xb5Q\xfagu\x958\xd5O\x93W\r\xc4 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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