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Stockage Cloud: 
Confidentialité, Encryption et 
Deduplication 
PUZIO Pasquale 
Doctorant CIFRE 
SecludIT & EURECOM
Stockage Cloud 
2
3
4
Confidentialité 
• Premier menace selon le rapport du CSA (Cloud Security Alliance) 
5
Encryption 
6
Encryption 
7
Deduplication 
8
Deduplication 
...mais ça ne marche pas avec les données chiffrées! 
D = Hello 
World 
D = Hello 
World 
ENCRYPTION with K1 ENCRYPTION with K2 
owhfgr0wgr[w 
hfrw0[h0[ergh 
e0[gh0[eg 
dfjl;dbfrwbfirbf 
roepthwobgfr 
ugtwertgrtwu 
9
Convergent Encryption 
K = hash(Data) 
D = Hello 
World 
D = Hello 
World 
ENCRYPTION with H(D) ENCRYPTION with H(D) 
klfgwilegfiorw 
egtriegtiergiei 
ergriegrigfifiw 
klfgwilegfiorw 
egtriegtiergiei 
ergriegrigfifiw 
10
Deduplication + Convergent 
Encryption 
11
Risques pour la Confidentialité 
• Confirmation of a file 
• Offline brute-force attack 
• Learn the remaining information 
12
Learn the remaining information attack 
13 
REMAINING 
INFORMATION
Solution: ClouDedup 
14
Merci 
Questions ? 
http://elastic-security.com/ 
http://secludit.com/ 
15

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