Cryptography

How cryptography works
For example someone has a secret
document to secure. Any document can be
secured using cryptography. For example we
have to secure the word “Read” using
cryptography. The word “Read” in cryptography
is called Plain text. Using a set of rule called
algorithm, the plain text is changed into cipher
text. This process is called encryption. The result
of this encryption process is the word “Uhdg”.
This is the cipher text.
A set of rule (algorithm) that is used in
encryption can be different. There are
many algorithm used in encryption. At the
above example we use Caesar Cipher
algorithm that is used by Julius Caesar to
secure his document.
The reverse process of encryption is called
decryption. The input is a cipher text. And the
result of decryption process is plain text.