Encryption technology in Layman's

In the Internet today, information is a special resource that differs from the material resources in our lives. Who can make full use of such resources, who will be able to get more wealth. So information security has become more and more important. So today we're going to look at the encryption technology for information on the Internet.

    What the hell is it? Practice, let's look at its definition first.

    encryption technology Cryptography is a technique for preventing information from being intercepted during transmission to ensure security. With the encryption technology, we are not afraid of information intercepted in the middle, even if he intercepted, but also a bunch of useless garbled, unless he has a key can be decrypted. in fact, encryption technology is also a kind of computer encoding, decoding a kind of . The application of encryption technology is many, but the most widespread is in e-commerce and vpn application, by the majority of users love. The encryption technology mainly consists of the algorithm and the key two parts.

Encryption Technology usually according to its algorithm is divided into two categories, one is symmetric encryption , the other is asymmetric encryption.

What is symmetric encryption and what is asymmetric encryption? Again, let's take a look at their definition.

    symmetric encryption is a technique for sending and receiving data using the same key for encryption, decryption, called symmetric encryption. Therefore, it is called Asymmetric encryption to send and accept the technique of encrypting using different keys for both sides of the data. Asymmetric encryption uses different keys for encryption and decryption, where it is divided into public and private keys. The public key is a public key, and the private key is the secret key that is not disclosed to the individual. Public and private keys they always appear in pairs, and when using public key cryptography, they must be decrypted with the private key, which must be decrypted using the public key when encrypting with the private key. In layman's words, symmetric encryption is the encryption and decryption of the end of the key is the same, so from the middle look at the encryption and decryption end is symmetric, anti-encryption and decryption end use of different keys, from the middle look at both ends are asymmetric, so called asymmetric encryption.

Symmetric encryption has the most typical data Encryption Standard (des), triple DES,RC-5 technology. DES is primarily encrypted with substitution and shift methods. It uses a single- digit key, which is a valid key, to encrypt the four-bit binary data block, each encryption can be 16 of the input data wheel Coding, by a series of shift, replace, the input of the raw data into the original to the output of unrecognizable data. As DES encryption, the decryption process.

 

and TripleDESencryption isDESencrypted version of the upgrade, thanDESencryption is more secure (because as computers speed up, people findDESencryption is not as secure as it gets. In a not long period of timeDESencryption can be computed entirely. ), what is the security law in particular? Let's take a detailed analysis below.

Here is the 3DES encryption process diagram, which we analyze through this graph. The principle of 3DES encryption and des encryption principle is exactly the same, the difference is that the 3DES more than a few times the des encryption and decryption process of accumulation. , the3DES uses 3 times DES encryption accumulation. First with the key K1 encryption, and then use K2 decryption into garbled, and then use the key K1 encryption. This encryption is equivalent to the length of the des key being extended on the basis of des .

We all understand the process of 3DES encryption, the process of decryption is the inverse process of encryption process, very good understanding, look at this picture below, OK .

with the development of the times, especially in our e-commerce industry today, the information security requirements are more and more high, just rely on these encryption technology is far from enough, so it has generated information digest technology, digital signature, digital certificate technology. Specifically about these technologies, we'll explore them in my follow-up blog.

Encryption technology in Layman's