Link encryption easier for users to use fewer keys, and end to end encryption is more flexible, visible to the user. In each node of the link encryption in the security situation in the case of non-confidence can also be used end to end encryption. There are a variety of data encryption algorithm [3-4], standard cryptographic algorithm developed information society is the inevitable trend of the field of secure communications around the world have an important subject. In accordance with the development process to minutes, through the classical password, symmetric key cryptography and public key cryptography stage has replaced the classical cipher encryption, permutation encryption; symmetric encryption algorithms including DES and AES; non-symmetric encryption algorithms including RSA, knapsack password McEliece password, Rabin, elliptic curve, EIGamal D_H and so on. Currently the most widely used data communication algorithms are DES algorithm, RSA algorithm and the PGP algorithm.
Previously mentioned, under the beta version of Microsofts response will not significantly modify the Windows 7, but there will be many small changes. Recently published in the Engineering Windows 7 blog posts, Microsoft in particular that the next public beta, which is close to the official product of the "candidate", what will change. In addition to the mentioned part of the previously reported, Microsoft will make more than 30 small changes, including expanding its Aero Peek touch interface, the FAT32 format for the old hard drive to increase the wider support, and in the background of the window if the user needs treatment, there will be more obvious tips.