IBM Redbook -Introduction to Grid Computing

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The public one is given to anyone needing it. A Certificate Authority is used to hold these public keys and to guarantee who they belong to. When a user uses his private key to encrypt something, the receiver uses the corresponding public key to decrypt it. The receiver knows that only that user’s public key can decrypt the message correctly. However, anyone could intercept this message and decrypt it because anyone can get the originator’s public key. If the originator instead doubly encrypts the message with his private key and the intended recipient’s public key, a secure communication link is formed.

Also, when the grid system depends primarily on the operating system for user login, the administrator may need to add entries to map the grid user to specific operating system user IDs on the donor machines. Similar enrollment activity is usually required to enroll donor machines into the grid. The machine’s identity is established and registered with the Certificate Authority. The administrator of the grid must have an agreement with the administrator of the donor machine about user IDs, software, access rights, and any policy restrictions.

Grid computing 27 protective “sandbox” around the program so that it cannot cause any disruption to the donating machine if it encounters a problem during execution. Rights to access files and other resources on the grid machine may be restricted. Third, the results of the job are sent back to the submitter. In some implementations, intermediate results can be viewed by the user who submitted the job. In some grid technologies that do not automatically stage the output data back to the user, the results must be explicitly sent to the user, perhaps using a networked file system.

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