Encryption :
is a process of converting a plain
text or data into cipher text so everyone can not read the data except the
sender and the receiver itself. Encryption is the best tool to protect data,
privacy, and your secret.
Decryption :
is a process of converting a cipher
text become data which is needed by the recipient to understand what the sender
wants from the encrypted data.
Advantages
of encryption :
Guarantee the confidentiality of any information,
Tackling the phone tapping,
Prevent unwanted access to documents and e-mail messages,
High encryption level is difficult to break.
Tackling the phone tapping,
Prevent unwanted access to documents and e-mail messages,
High encryption level is difficult to break.
Disdvantages
of encryption :
Messages can not be read when the message receiver forget or lost keys
Encryption of terorist planning
Advantages
of Decryption :
Easy to
understanding the content of the message
Disadvantages
of Decryption :
Because the
encryption program can use the same algorithm in different ways, thats why the
recipient of the encrypted information must have the same program with the
sender to decrypt the data they receive.
Methods
of Encryption
1. Symetric
key encryption
Is a
method where the sender and the receiver make a secure internet session by
create a single encryption key, so the sender and receiver use the same key.
Symetric
encryption is easy and fast to use, but it is not safe because someone could
intercept the key and decode the message. But because of its speed, it's
commonly used in e-commerce transactions. The strength of the encryption key is
measured by its bit length. Today, a typical key will be 128 bits long (a
string of 128 binary digits).
2. Public key
encryption (asymetric)
is a
method which is more safety than symetric key encryption because it used two
keys : one shared (or public key) and one totally private key.
The public
key is made available to anyone who wants to send encrypted information. They just
can encoding, not decoding the data.
The
private key stays safe with you. When people want to send encrypted
information, they using your public key. When you receive the cipher text, you
decrypt it with your private key. Asymetric encryption added level of security
to your data, but there is more computing time required, so the process is longer
than the symetric key encryption.
How
the Symetric key encription and the Public key encryption works?
Symmetric
and public key encryption uses two different algorithms to produce ciphertext.
In symmetric encryption, the
algorithm breaks down the data into small pieces called blocks. Then it would
replace the letters position, change the information in each block into
numbers, compresses and expands the data, and then run it through a
mathematical formula including the key in it. Then the algorithm will repeats
the process.
In Public key encryption (asymetric), the
algorithm treats the text as a large number, then multiply it to a larger
number, and calculates the remainder after dividing by other third-largest
number. Finally, the rest of the number is converted to text back. This
algorithm is used in a large and dynamic communication network.
