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Rabu, 25 Maret 2015
Catatan data Security
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
26 52 78 104 130 156 182 208 234 260 286 312 338 364 390
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26
1 9 21 15 3 19 7 23 11 5 17 25
1. Julius Caesar
Kunci = k
E: c(i)=p(i)+k mod 26
D: p(i)=c(i)-k mod 26
K=3
Plaintext: AXE
A 0 + 3 = 3 MOD 26 = D
X 23 + 3 = 26 MOD 26 0 = A
E 4 + 3 = 7 MOD 26 = H
Ciphertext : DAH
AXE DAH
K=5
Ciphertext : ADI
A=0 – 5 = -5 mod 26 21 = V
D=3 – 5 = -2 mod 26 24 = Y
I = 8 – 5 = 3 mod 26 3 = D
Plaintext : VYD
2. Mono Alphabetic
Kunci = kata/kalimat
3. Poly Alphabetic
T1, t2,
Plaintext DEFA
Plain1 A B C D E F G H…..
Cipher1 K L M S T Y W X….
Ciphertext1 S T Y K
Plain2 A B C D E F G .. K …S T .. Y
Cipher 2 J R S W Y L K …. A..C N.. B
Ciphertext2 C N B A
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
26 52 78 104 130 156 182 208 234 260 286 312 338 364 390
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26
1 9 21 15 3 19 7 23 11 5 17 25
1. Julius Caesar
Kunci = k
E: c(i)=p(i)+k mod 26
D: p(i)=c(i)-k mod 26
K=3
Plaintext: AXE
A 0 + 3 = 3 MOD 26 = D
X 23 + 3 = 26 MOD 26 0 = A
E 4 + 3 = 7 MOD 26 = H
Ciphertext : DAH
AXE DAH
K=5
Ciphertext : ADI
A=0 – 5 = -5 mod 26 21 = V
D=3 – 5 = -2 mod 26 24 = Y
I = 8 – 5 = 3 mod 26 3 = D
Plaintext : VYD
2. Mono Alphabetic
Kunci = kata/kalimat
3. Poly Alphabetic
T1, t2,
Plaintext DEFA
Plain1 A B C D E F G H…..
Cipher1 K L M S T Y W X….
Ciphertext1 S T Y K
Plain2 A B C D E F G .. K …S T .. Y
Cipher 2 J R S W Y L K …. A..C N.. B
Ciphertext2 C N B A
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