• Differences and Applications: Symmetric and Asymmetric Encryption

  • The most common algorithm adopte by encryption softwares at present are symmetric encryption and asymmetric encryption. It will be useful for choosing your fittest way to peotect your data by getting a main idea of their different and features.
  • What is the symmetric cryptosystem?
  • Symmetric cryptosystem is also called one-key cryptosystem, ie. the information would be encrypted or decrypted by the same secret key. It includes the algorithm just as DES, 3DES, Blowfish, IDEA, RC4, RC5, RC6, AES, SKIPJACK etc.. Symmetric cryptosystem was recommended for its open algorithm, less calculation, high speed and efficiency. However, it also comes with the disadvantages of the "one key" for encryption and decryption, and the perfect security cannot be guaranteed.

  • What is the asymmetric cryptosystem?
  • Compared with symmetric cryptosystem, the asymmetric needs two secret keys: the publickey and the privatekey, which come in pairs. If the data were encrypted by the publickey, only the corresponding privatekey can decrypt it, and vise versa. That's the reason why it is called asymmetric.
  • The features of asymmetric cryptosystem

  • The asymmetric cryptosystem provides better confidentiality for the data encrypted, because this method exempt the end users from exchanging the secret keys. The main drawback is low speed in both encryption and decryption, so it is well-suited to encryption for a small amount of data, instead of normal files. The typical application of asymmetric cryptosystem is the digital signature. With the double secret keys in pairs, this method fits for the banks. The widely used asymmetric algorithm are RSA and DSA, which was brough out by NIST (National Institute of Standards and Technology).

  • Compared with symmetric cryptosystem, the asymmetric needs two secret keys: the publickey and the privatekey, which come in pairs. If the data were encrypted by the publickey, only the corresponding privatekey can decrypt it, and vise versa. That's the reason why it is called asymmetric.

  • With different features, the various encryption algorithms are playing their own parts in different industries. With the AES (Advanced Encryption Standard ) ,which was also adopted by the federal government for business and government data, idoo Encryption enhanced the security by the 256-bit key, and it perfectly fits the encryption for business and personal computer data. By the way, in order to improve security, when you are setting the password, please take both its length and the complexity into consideration. Because the simple password may be easily cracked, while by the combination of alphabetic characters, numbers and symbols, the complex ones will definitely much more advisable.

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