Research of information encryption technology-essay代写

留学生essay代写精选范文：“Research of information encryption technology”，这篇论文讨论了信息加密技术。互联网其实是一把双刃剑，它在给大家带来便利的同时，也会有一定的危害，就好比用户的个人信息，很容易会被黑客或者不法分子窃取。要解决这个问题，就必须要把信息加密技术重视起来。信息加密，就是把信息按某种算法进行处理，让它成为了一段不可读的代码，从而防止别人窥探。信息加密技术作为网络安全技术的核心，是非常重要的。

With the development of network technology, network in providing great convenience to people as well as many security risks, viruses, hackers, and computer threats have become commonplace, in order to allow Internet information to correctly and efficiently used by people, Internet security becomes more urgent.

With the rapid development of network technology, the Internet has become the main means of sharing information and resources, in the face of the open system interconnection, people bemoan the superb modern network technology and convenience at the same time, will face a series of safety problems. How to protect computer information security, or confidentiality of information content is particularly important.

Data encryption is the main solution to network security and asked to take confidential security measures. Is the most commonly used means of security, data encryption technology, you can improve the security of data transmission to some extent, ensure the integrity of transmitted data.

The basic process of data encryption is the original plaintext file or data according to an algorithm for processing. Make it unreadable code, commonly called "ciphertext" transmission, upon arrival makes it only after the Enter key may not display the content through such a way to protect the data from being illegally steal, modify the objective. The inverse process to decrypt, is the process of encoding information into their original data. Data encryption techniques are mainly divided into encrypted data encryption and data storage. Data encryption technology is to encrypt the data stream that is being transmitted, nodes commonly used link encryption, encryption and end-to-end encryption in three ways.

Encryption is implemented by a variety of encryption algorithms, the traditional encryption systems are based on the key, is a symmetric encryption uses the same key to encrypt and decrypt that user. While the public key is an asymmetric encryption method. Encrypt and decrypt each have a different key, symmetric encryption algorithms include DES and IDEA; asymmetric encryption algorithms including RSA, backpack passwords. Currently most commonly used algorithms in data communication DES algorithm, such as RSA and PGP algorithms.

Symmetric cryptography is a traditional cryptography, also known as private key cryptography. In a symmetric cryptographic system, encrypted and decrypted using the same key. Because the encryption and decryption keys the same requires the communicating parties must select a key and save them, the parties must trust each other not to key out, so that you can achieve data confidentiality and integrity. For a network with n users, you need n (n-1)/2 keys in the case of user group is not very large, symmetric encryption system is effective. DES algorithm is the most typical symmetric-key cryptography algorithms.

DES is a block cipher, with a special transform function to encrypt the plaintext. By first 64bit into plaintext by leader groups, and then use the transformation function to encrypt these groups in turn, each 64bit output the ciphertext, and finally all the ciphertext string together the whole ciphertext. Key length 56bit, composed by any 56-bit number, with up to 256, and can be replaced at any time. Makes it impossible to crack, therefore, DES security is entirely dependent on the key protection. DES speed, suitable for encrypting large amounts of data, but the disadvantage is the secure distribution of keys difficult.

Asymmetric key cryptography is also called public key technology, which is the password for the private key the defects of the system was brought up. Public key technology use two passwords instead of a password: one of the public key is used to encrypt the data, and another private key is used to decrypt the data. Which are related in the numbers, but even with a lot of computer supported cooperative operations, to reverse calculated from the public key corresponding to the private key is not possible. This is because the two basic principles of key generation based on a mathematical calculation of characteristics, that is, multiplying two-digit prime number can easily get a huge number, but if you will, in turn, this huge charge number into its two prime numbers, even the super computer it would take a very long time. In addition, any one key pair can be used for encryption and another for decryption, and key to the one called a private key known only to the owner of the key pair, and private keys can be used as the identity of its owner.

Based on the public key algorithm, a known public key is a private key cannot be derived. Finally when using the public key, such encryption programs you want to install, set the private key, and large public key generated by the program. Users to contact who sent copies of the public keys, and they use the same encryption program. Then others will be able to send the initial users with public keys encrypt password information. Only users can decode that information, because decoding requires the consumer to know the password of public keys. It was only the user knows the private key. Involved in the process. Information obtained by the receiving party public key there are two ways: one is the direct contact with each other for each other's public keys; another is the reliable verification to a third party agency, reliable access to each other's public keys. Public-key algorithms in the system's most famous representative is the RSA system, there are also: backpack password, elliptic curves, and so on. Key advantage of the openness of the Internet, and the key management problem is simple, can facilitate the realization of digital signing and verification. But its complex algorithms, cryptographic data rate low. However, with the development of modern electronic technology and cryptography, public-key cryptography is a very promising network security encryption system.

Practical application of cryptography in the main link encryption, nodes and end-to-end encryption and other three ways, each at different OSI levels using encryption technology. Link encryption is commonly used hardware implementation at the physical layer, encryption of all data encryption, the encryption is transparent to the user, paragraph-by-paragraph order automatically by the network, the user does not need to understand the details of the encryption technology, mainly used for channel or link may be intercepted in the protected part. Link encryption, all messages are passed in clear text for each node of the processor. In the node data is vulnerable to harm from illegal access. Improvements on link encryption encryption is the node, in the Protocol on transport layer encryption, encryption algorithms to combine in a cryptographic module attached to nodes in the plaintext data exist only in the security module, overcame the link encryption weaknesses in node vulnerable to illicit access. Network layer encryption, often referred to as end-to-end encryption, end-to-end encryption is a cryptographic device in the network layer above or between the presentation layer and the transport layer for transmission of data encryption, user data exists in its ciphertext form throughout the transfer process. It does not need to consider your network lower, lower layer protocol information transmitted in clear text, because routing information is not encrypted, and vulnerability analysis.

Different emphasis in different encryption at the network level, network applications can link encryption or combined nodes are encrypted end-to-end encryption, you can make up for the lack of a single encryption, thereby improving network security. For network security requirements at different levels have worked out a different security protocols in order to provide better encryption and authentication services, each of which are located in different levels of computer architecture. Hybrid encryption method and there are two advantages of cryptography, so as to constitute an ideal password and has been widely used. Many times in the data transmitted data are just a few of them contain important or critical information, data security is guaranteed as long as this part of entire data can be considered safe, in this case some encryption schemes can be used in data compression only important or critical information part of the encrypted data. Will greatly reduce the computation time, so data can quickly transfer and does not affect the accuracy and completeness, especially in real-time data transmission method can have very significant effects.

Information encryption technology as the core of the network security technology, its importance should not be overlooked. With the development of open and decrypt encryption algorithm, each country is constantly committed to develop and design a new encryption algorithm and encryption mechanisms. So we should continue to develop information and the development of new cryptographic techniques to adapt to numerous changes in network security environment.

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