Problems 14.1 One local area networ

Problems
14.1 One local area network vendor provides a key distribution facility, as illustrated in Figure 14.17.
a. Describe the scheme.
b. Compare this scheme to that of Figure 14.3.What are the pros and cons?
14.2 “We are under great pressure, Holmes.” Detective Lestrade looked nervous.“We have learned that copies of sensitive government documents are stored in computers of one foreign embassy here in London.Normally these documents exist in electronic form only on a selected few government computers that satisfy the most stringent security requirements. However, sometimes they must be sent through the network connecting all government computers.But all messages in this network are encrypted using a top-secret encryption algorithm certified by our best crypto experts.Even the NSA and the KGB are unable to break it.And now these documents have appeared in hands of diplomats of a small,otherwise insignificant,country.And we have no idea how it could happen.” “But you do have some suspicion who did it,do you?”asked Holmes. “Yes,we did some routine investigation.There is a man who has legal access to one of the government computers and has frequent contacts with diplomats from the embassy.But the computer he has access to is not one of the trusted ones where these documents are normally stored.He is the suspect,but we have no idea how he could obtain copies of the documents.Even if he could obtain a copy of an encrypted docu- ment,he couldn’t decrypt it.”

Kết quả (Anh) 2:

Problems
14.1 One local area network vendor Provides a key distribution facility, as Illustrated in Figure 14:17.
a. Describe the scheme.
b. Compare this to mà scheme of Figure pros and cons are the 14.3.What?
14.2 "We are under great pressure, Holmes." Detective Lestrade Looked nervous. "We have Learned That copies of sensitive documents are stored in computers Government of one Foreign embassy These documents here in London.Normally exist only in electronic form on a selected ít That Satisfy The Most computers Government stringent security requirements. Tuy nhiên, sometimes chúng Phải sent through the network connecting all Government computers.But all messages are encrypted in this network using a top-secret encryption algorithm certified by the NSA experts.Even our best crypto and the KGB are thể break it.And These documents have now appeared in hands of diplomats of a small, insignificant nếu không, We have no idea how country.And Could it happen. "" But you have some suspicion because of who did it, do you? "Asked Holmes. "Yes, We did some routine investigation.There is a man who has legal access to one of the Government computers and has frequent contacts with diplomats from the embassy.But he has access to the computer is not one of the trusted ones where những documents Bình thường are stored.He is the Suspect, but have no idea how he chúng không lấy copies of the documents.Even if he không lấy a copy of an encrypted docu- ment, he could not decrypt it. "