Nowadays, information security is the main concern on the Internet. With web data continuously flowing from one end to another, to ensure data security, there are many procedures that must be implemented. Different organizations are working to find a more secure way to protect data.
There are also some key terms when it comes to information security — like confidentiality, integrity, availability, etc. Confidentiality means that only authorized users can gain access to sensitive data. Integrity confirms that data has not been modified by any mid-level person. Additionally, this means that the data reached the other user without changes or a breach. Lastly, availability means that data is available for any authorized user. There are many procedures that confirm data confidentiality, integrity, and availability. Almost all procedures use some type of encryption/decryption algorithm to keep data secure from middle attacks. And there are two kinds of security algorithms: symmetric algorithms (use the same secret key to encrypt/decrypt data) and asymmetric algorithms (use different secret keys to encrypt/decrypt data). The main goal of this article is to describe DES algorithm and how it secures data.