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Kriptografi (Part III)

Kriptografi (Part III). Metode Affin Chiper. Karakter = Pi Kunci = a,k Enkripsi Ci =(( a x Pi) + k )mod 26 Deskripsi Pi=1/a( Ci -k) mod 26 Indeks dimulai dari nilai 0 Nilai k sebarang Akan tetapi syarat a Gcd ( a,n )=1. Contoh. Kunci : 5,15 Kunci:7,8

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Kriptografi (Part III)

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  1. Kriptografi (Part III)

  2. MetodeAffinChiper Karakter = Pi Kunci = a,k Enkripsi Ci=((a x Pi) +k )mod 26 Deskripsi Pi=1/a(Ci-k) mod 26 Indeksdimulaidarinilai 0 Nilaik sebarang Akantetapisyarat a Gcd(a,n)=1

  3. Contoh Kunci : 5,15 Kunci:7,8 Pesan :PAGI Pesan : MAKIN Chiperteks? Plainteks?

  4. Metode Hill Chiper Kunciadalahmatriksbujursangkardengandeterminanmisalnya d, mempunyaisyaratgcd(d,26)=1 Enkripsi Plain Teks = P Kunciberukuran K x K Plain teksdibloksetiap k karakter

  5. Metode Hill Chiper Perkalianmatriks key dari plain teks Dibentukmatriksdenganbanyakkolom k dansetiapbarisadalahmasing – masingblok Dimulaidariindeks 0 C= P K mod n P=CK-1 mod n

  6. Contoh Pesan : SIANG Kunci : Pesan : SEMOGA Kunci:

  7. Transposisi Merubahposisikarakterdalamplainteks Plain teksdanchiperteksberasaldari alphabet yang sama. Tekniktransposisistandar • Bagi plain tekskedalamblok – blok • Lakukanpermutasikarakter

  8. Transposisi zigzag

  9. Transformasisegitiga

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