PPT Slide

m1 m2 ... mi mk1

mi ? ?1

C1(m)

c1 c2 ... ci cn1

C2(c1)

C2(c2)

C2(cn1)

c11…c1n2

c21…c2n2

cn1 1…cn1 n2

ci ? ?1 = ?2k2 , since q1 = q2k2

k2

n1n2

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