Shulou(Shulou.com)06/02 Report--

The editor will share with you the difference between symmetric encryption and asymmetric encryption. I hope you will gain a lot after reading this article. Let's discuss it together.

Differences: 1. In symmetric encryption, encryption and decryption use the same secret key; in asymmetric encryption, two keys are used, usually using public key for encryption and private key for decryption. 2. The speed of symmetric encryption and decryption is relatively fast, while the time of asymmetric encryption and decryption is long and the speed is relatively slow. 3. The security of symmetric encryption is relatively low, while that of asymmetric encryption is higher.

What is symmetrical encryption technology?

Symmetric encryption uses symmetric cipher coding technology, which is characterized by the use of the same key for file encryption and decryption.

That is, the key can also be used as the decryption key. This method is called symmetric encryption algorithm in cryptography. The symmetric encryption algorithm is simple and fast to use, the key is short, and it is difficult to decipher. In addition to the data encryption Standard (DES), another symmetric key encryption system is the International data encryption algorithm (IDEA), which has better encryption than DES and requires less computer functions.

Symmetric encryption algorithm has several problems in the process of e-commerce transactions:

1. It is required to provide a secure channel for both parties to negotiate a common key during the first communication. Direct face-to-face negotiations may be unrealistic and difficult to implement, so the two sides may need to consult with other relatively insecure means such as e-mail and phone calls.

2. The number of keys is difficult to manage. Because each partner needs to use a different key, it is difficult to adapt to the large amount of information exchange in the open society.

3. Symmetric encryption algorithms generally can not provide the identification of information integrity. It cannot verify the identity of the sender and receiver

4. The management and distribution of symmetric keys is a potentially dangerous and tedious process. Symmetric encryption is based on keeping secrets together. The trading parties using symmetric encryption technology must ensure that the same key is used and that the exchange of keys between them is secure and reliable. At the same time, procedures should be set to prevent the disclosure of keys and change keys.

Suppose that two users need to encrypt and exchange data using symmetric encryption, then users need at least 2 keys and exchange them. If there are n users in the enterprise, the whole enterprise needs a total of n × (nmae1) keys. The generation and distribution of keys will become a nightmare for the enterprise information department.

Common symmetric encryption algorithms are DES, 3DES, Blowfish, IDEA, RC4, RC5, RC6 and AES

What is asymmetric encryption

Unlike symmetric encryption algorithms, asymmetric encryption algorithms require two keys: public key (publickey) and private key (privatekey).

The public key and the private key are a pair. If the data is encrypted with the public key, it can be decrypted only with the corresponding private key; if the data is encrypted with the private key, it can be decrypted only with the corresponding public key. Because encryption and decryption use two different keys, this algorithm is called asymmetric encryption algorithm.

The basic process of asymmetric encryption algorithm to realize the exchange of confidential information is as follows: party A generates a pair of keys and exposes one of them as a public key to other parties; Party B who gets the public key uses the key to encrypt the confidential information and then sends it to Party A; Party A decrypts the encrypted information with another private key saved by Party A. Party A can only use its private key to decrypt any information encrypted by its public key.

The difference between symmetric encryption and asymmetric encryption

1. The encryption and decryption processes are different.

The encryption process of symmetric encryption uses the same key as the decryption process, and the encryption process is equivalent to using the original text + key to transmit the ciphertext, while the decryption process uses the ciphertext-key to deduce the original text.

However, asymmetric encryption uses two keys, generally using a public key for encryption and a private key for decryption.

2. Different encryption and decryption speeds

The speed of symmetrical encryption and decryption is relatively fast, which is suitable for the use of data for a long time. Asymmetric encryption and decryption take a long time and are relatively slow, so they are only suitable for the use of a small amount of data.

3. The security of transmission is different

In the process of symmetric encryption, it is impossible to ensure that the key is safely transmitted, and the ciphertext may be intercepted by a third party in the process of transmission. if the password book is also intercepted by a third party, the transmitted password information will be cracked by the third party, and the security is relatively low.

In the asymmetric encryption algorithm, the private key generates different random numbers based on different algorithms, and the private key deduces the public key through a certain encryption algorithm, but the derivation process from the private key to the public key is one-way, that is to say, the public key can not be deduced from the private key. So the security is higher.

After reading this article, I believe you have a certain understanding of the difference between symmetric encryption and asymmetric encryption, want to know more about it, welcome to follow the industry information channel, thank you for reading!

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