Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

56d5f65b0d4658ff61b457548b96504e8fd9c51b3f96c46301832834688c770ed6f1468c28e71426004db3460fa6fd7af5ee8bbb207982e7194ec7e60ed206c1

Ciphertext (hexencoded):

56d5f65b0d4658ff61b457548b96504e 8fd9c51b3f96c46301832834688c770e d6f1468c28e71426004db3460fa6fd7a f5ee8bbb207982e7194ec7e60ed206c1

Plaintext (hexencoded):

56d5f65b0d4658ff61b457548b96504e 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

V\xd5\xf6[\rFX\xffa\xb4WT\x8b\x96PN {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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