Chiffrement - Webdam Project - Inria
Chiffrement - Webdam Project - Inria
Chiffrement - Webdam Project - Inria
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Décomposition de requête (4)<br />
πname,pname<br />
σsalary >100k and<br />
e.pid = p.pid<br />
Client Query<br />
Q: SELECT name, pname<br />
FROM emp, proj<br />
WHERE emp.pid=proj.pid AND<br />
salary > 100k<br />
D<br />
e.p_id = p.p_id<br />
Q S : SELECT e_emp.etuple,<br />
e_proj.etuple<br />
FROM e_emp, e_proj<br />
WHERE e.p_id=p.p_id AND<br />
s_id = 1 OR s_id = 2<br />
σs_id = 1 v s_id = 2<br />
E_EMP<br />
Server Query<br />
E_PROJ<br />
Q C : SELECT name, pname<br />
FROM temp<br />
WHERE emp.pid=proj.pid AND<br />
salary > 100k<br />
N. Anciaux<br />
Sécurité des BD : cryptographie dans les BD<br />
30
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