JVCL Help:TJvVigenereCipher
JVCL Help: TJvVigenereCipher Class
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TJvCustomCipher
TJvVigenereCipher
run\JvCipher.pas
Summary
A component that encodes and decodes according to the Vigenere cipher method
Pascal
run\JvCipher.pas
TJvVigenereCipher = class(TJvCustomCipher);
Description
- JVCLInfo
Here is a short explanation of the vigenere cipher, inspired by the much more complete description available at this address: http://www.trincoll.edu/depts/cpsc/cryptography/vigenere.html
For each letter of the Key, a new alphabet is created by shifting the usual alphabet to start at the same letter as in the key. For instance, if the key is CUP then three alphabets are created:
CDEFGHIJKLMNOPQRSTUVWXYZAB UVWXYZABCDEFGHIJKLMNOPQRST PQRSTUVWXYZABCDEFGHIJKLMNO
When encoding a string, each alphabet is used in turn as a lookup table. For instance, if we encode HELLO, then we have this:
H --> JE --> Y L --> A L --> N
O --> I
As you can see, the same letter is not always encoded by the same letter, thus making statistical analysis a bit harder. The implementation in this component considers an alphabet of 255 characters, thus encoding every single character no matter what its value is.
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