Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

6d29a1a43100684d0af30dcc15f465cc53c2416008317429611b4da2ccb14979ba535098b8c34ddaa6d9dc1626ca21ae90ac7b75988d6a26f2b9cb84312ee359

Ciphertext (hexencoded):

6d29a1a43100684d0af30dcc15f465cc 53c2416008317429611b4da2ccb14979 ba535098b8c34ddaa6d9dc1626ca21ae 90ac7b75988d6a26f2b9cb84312ee359

Plaintext (hexencoded):

6d29a1a43100684d0af30dcc15f465cc 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

m)\xa1\xa41\x00hM\n\xf3\r\xcc\x15\xf4e\xcc {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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