Arrow

HxD라는 헥사 편집기 이용

 

Clone Detection

-> "No clones have been detected try lowering the similarity or detail parameters."(=유사성 또는 세부 정보 매개 변수를 낮추려고 시도한 복제가 탐지되지 않았습니다)라고 뜸

 

Error Level Analysis

-> 값이 나오지 않음

 

Exif
http://ns.adobe.com/xap/1.0/
<?xpacket begin='
' id='W5M0MpCehiHzreSzNTczkc9d'?>
<x:xmpmeta xmlns:x='adobe:ns:meta/' x:xmptk='Image::ExifTool 12.44'>
<rdf:RDF xmlns:rdf='http://www.w3.org/1999/02/22-rdf-syntax-ns#'>
 <rdf:Description rdf:about=''
  xmlns:xmpRights='http://ns.adobe.com/xap/1.0/rights/'>
  <xmpRights:Certificate>solve the problem,find (x) value || encryptype : t0R f(x)=x^2-4x+3 || sdvvrug : qrmlq (hint: highest (x) value is correct)</xmpRights:Certificate>
 </rdf:Description>
</rdf:RDF>
</x:xmpmeta>
                                                                                                    
                                                                                            
                                                                                                    
                                                                                                    
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<xmpRights:Certificate>solve the problem,find (x) value || encryptype : t0R f(x)=x^2-4x+3 || sdvvrug : qrmlq (hint: highest (x) value is correct)</xmpRights:Certificate>

이 문장을 보면 정답을 유추하는데 도움이 될 것이라고 생각함

x^2-4x+3 = (x-3)(x-1) 

즉, x = 1 or 3이 나오는데 가장 큰 x의 값이 correct라고 해서 3인가?라고 유추했지만 아니었음