1. Cesar & Vigenere Encryption
Matlab
Cesar & Vigenere
Encryption

2. Basic Knowledge Plaintext Algorithm & Key Ciphertext
Encryption Process
Decryption Process

3. Implementation Matlab
Plaintext
Algorithm & Key
Ciphertext
Encryption Process
Decryption Process
Input
Text / Data
KEY
ALGORITHM
Transformation
Output
Decryption Process
Encryption Process

4. Inputan plaintext & key
txt='apa'
key=1;
Input
Text / Data
KEY
ALGORITHM
Transformation
Output
Encryption Process

5. Transform abjad --> angka
if ( (txt < 'a') | (txt > 'z') ),
error('Text character out of range a-z');
end;
y=txt - 'a';
Input
Text / Data
KEY
ALGORITHM
Transformation
Output
Encryption Process

6. Enkripsi hasil_modulus=mod((y+key),26); Encryption Process Input
Text / Data
KEY
ALGORITHM
Transformation
Output
Encryption Process

7. Transform angka --> abjad
if ( (hasil_modulus < 0) | (hasil_modulus > 25) ),
error('Integer out of range ');
end;
cipher=char(hasil_modulus + 'a')
Input
Text / Data
KEY
ALGORITHM
Transformation
Output
Encryption Process