asp net mvc 5 return pdf : Change pdf to image online Library SDK API .net asp.net html sharepoint Illies_NIST_050-part1199

A Note on the Practical Value  
of Single Hash Collisions  
for Special File Formats  
Max Gebhardt, Georg Illies, Werner Schindler  
Bundesamt für Sicherheit in der Informationstechnik 
G. Illies / 31 October 2005  
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Reusable Collisions  
or hash collision attacks on electronic signatures the forger  
ˆ
needs: meaningful collisions 
ˆ
would appreciate: reusable collisions 
Reusable hash collision: A hash collision from which 
many meaningful collisions with controllable contents  
(=meanings) can easily be derived
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Strategy for 
Merkle-Damgard Hash Functions  
Basic Property of Merkle-Damgard hash functions:  
(and a’ strings with length(a)=length(a’) = multiple of input block length,  
H
the hash function without length padding)  
H
0
(a)=H
0
(a’) implies 
H(a||b)=H(a’||b) for an arbitrary string b 
Strategy: - - Hide two messages in string 
- Use a/a’ as a “switch” that makes one of these 
messages “visible” 
then a/a’ is a reusable hash collision 
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Daum/Lucks’ PostScript example  
M. Daum and S. Lucks (rump session Eurocrypt ’05): 
ˆ
PostScript allows “if-then-else” commands (= switch) 
ˆ
D&L constructed a universally reusable MD5-collision for 
PS satisfying the difference scheme of X. Wang, H. Yu 
How to Break MD5 ..”, Eurocrypt ’05 (we call such MD5­
collisions WY examples
ˆ
D&L pointed out: Similar constructions possible for all file 
formats which allow comparable “if-then-else” constructs  
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PostScript 
M
1
.ps: 
Preamble||(S
1
)(S
1
)eq{T
1
} {T
2
}  
M
2
.ps: 
Preamble||(S
2
)(S
1
)eq{T
1
} {T
2
}  
Output for M
1
.ps is determined by commands T
1
output for M
2
.ps is determined by commands T
2
(`Preamble||(S
1
´)= H
0
(`Preamble||(S
2
´) implies H(M
1
.ps)=H(M
2
.ps). 
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PostScript  
Yields transformation (perfect universality): 
Given any two PS documents a.ps and b.ps 
one gets two others a‘.ps and b‘.ps with 
ˆ
same viewer or printer output as for a.ps and b.ps, resp.  
ˆ
H(a‘.ps)=H(b‘.ps
PDF  
ˆ
PDF: no programming constructs, in particular no 
“if-then-else” (except for embedded JavaScript) 
ˆ
But: Indexed Color Spaces represented by hex strings. 
(The WY strings are contained in these strings) 
ˆ
Also: Transfer functions translating bytes of this string 
to gray scale values 
Two messages printed with different grey scales 
We constructed explicit WY examples for this method. 
PDF  
H(file1.pdf)= 
H(file2.pdf) 
Message 
= white 
Message 1 
Message 2 
Message 
Output for file1.pdf 
Output for file2.pdf 
PDF  
les contain a stream 
´.. /HelpGS1 gs 
.. 
selects the graphic state 
.. 28 
sc 
.. 
set color: use byte no. 28 of color string 
.. (price 100$)  
.. 
Message 1 
.....  
.. /HelpGS2 gs 
..  
.. 28 
sc 
..  
.. (price 150$)  
..´ 
Message 2 
e two graphic states HelpGS1 and HelpGS2 employ 
fferent transfer functions. 
TIFF  
ˆ
TIFF (Tagged Image File Format, used for scanned paper 
documents) also has no programming constructs 
ˆ
But: Offsets for the position of the graphical informations  
We constructed reusable WY-examples. 
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