Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

5c4f80d817895f8f70aef05a70294f0a7dd09227ccf621c4ae594272218108644442ee0489f438225af12d983f11ceb98f099bc3bda35c093d6df52d11f40db4

Ciphertext (hexencoded):

5c4f80d817895f8f70aef05a70294f0a 7dd09227ccf621c4ae59427221810864 4442ee0489f438225af12d983f11ceb9 8f099bc3bda35c093d6df52d11f40db4

Plaintext (hexencoded):

5c4f80d817895f8f70aef05a70294f0a 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\\O\x80\xd8\x17\x89_\x8fp\xae\xf0Zp)O\n {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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