Xem 1-20 trên 119 kết quả Messaging security
  • Presence of the network makes a distributed system susceptible to security attacks such as tampering of messages and masquerading, which can be launched through interprocess messages. This chapter discusses authentication and message security measures used in distributed operating systems to thwart such attacks. Methods of verifying authenticity of data are also discussed.

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  • Ebook "Network security technologies" presents key security technologies from diverse fields, using a hierarchical framework that enables understanding of security components, how they relate to one another, and how they interwork. This text is unique in that it classifies technologies as basic, enhanced, integrated, and architectural as a means of associating their functional complexities, providing added insight into their interrelationships. It introduces and details security components and their relationships to each other.

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  • A Brief History of Security “Well, I never heard it before,” said the Mock Turtle, “but it sounds uncommon nonsense.” —Lewis Carroll, Alice in Wonderland. Secret communication achieved by hiding the existence of a message is known as steganography. The word is derived from the Greek word “steganos,” meaning cov- ered and “graphin” meaning to write.

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  • Even as recently as five years ago, many computer industry experts would never have guessed how pervasive and “business critical” electronic messaging would eventually become. The degree to which some information technology professionals are surprised by the pervasive nature of today’s electronic mails systems is merely amusing to those of us that have had an e-mail address for more than 20 years.

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  • Home IT-Training Courses Windows Server Messaging System Sharepoint Server Network Security Virtualization Technologies Other Technology...

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  • This document provides an introduction to using message level security, in particular GSI Secure Conversation message level security, with the Globus Toolkit 3. It is based upon and replicates documentation listed in section 10 but combines this into a (hopefully) more coherent and useful form. Transport level security is not described since this is to be deprecated in future releases. I did not have root access so some of the issues relating to configuring GSI and installing host certificates is conjecture (!)....

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  • Network security can provide five services. Four of these services are related to the message exchanged using the network. The fifth service provides entity authentication or identification.

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  • Each of the messages, like each one he had ever read of Stern's commands, began with a number and ended with a number or row of numbers. No efforts on the part of Mungo or any of his experts had been able to break Stern's code, nor was there any clue as to what the preliminary number and those ultimate numbers signified. —Talking to Strange Men, Ruth Rendell

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  • In this age of universal electronic connectivity, of viruses and hackers, of electronic eavesdropping and electronic fraud, there is indeed no time at which security does not matter. Two trends have come together to make the topic of this book of vital interest. First, the explosive growth in computer systems and their interconnections via networks has increased the depen- dence of both organizations and individuals on the information stored and communicated using these systems.

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  • Requirements - must be able to verify that: 1. Message came from apparent source or author, 2. Contents have not been altered, 3. Sometimes, it was sent at a certain time or sequence. Protection against active attack (falsification of data and transactions)

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  • Up to this point we have seen: Classical Crypto Symmetric Crypto Asymmetric Crypto These systems have focused on issues of confidentiality: Ensuring that an adversary cannot infer the original plaintext message, or cannot learn any information about the original plaintext from the ciphertext. In today’s lecture we will put a more formal framework around the notion of what information is, and use this to provide a definition of security from an information-theoretic point of view.

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  • Oracle Secure Backup, Oracle's new tape backup management software, delivers secure, high performance network tape backup for Oracle databases and file systems. It provides an integrated, easy-to-use backup solution that encrypts data to tape to safeguard against the misuse of sensitive data in the event that backup tapes are lost or stolen. Oracle Secure Backup provides optimized backup performance of Oracle Databases via tight integration with the database engine, as well as advanced backup functionality including automated tape rotation, known as “vaulting”. ...

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  • Privacy Enhanced Mail (PEM) was the first serious effort to secure Internet mail. The Internet Resources Task Force (IRTF) Privacy and Security Research Group (PSRG) did the initial design. The Internet Engineering Task Force (IETF) PEM Working Group continued development for three years, resulting in a four- part Proposed Internet Standard published in early 1993 [64] [56] [5] [55]. PEM is a broad standard suite, it provides encryption, authentication, message integrity and key management. PEM supports both symmetric and asymmetric (public- key) key management schemes.

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  • At cats' green on the Sunday he took the message from the inside of the pillar and added Peter Moran's name to the two names already printed there in the "Brontosaur" code. The message now read: “Leviathan to Dragon: Martin Hillman, Trevor Allan, Peter Moran: observe and tail.” What was the good of it John hardly knew. He felt better, he felt that at last he had made an attack on Peter Moran instead of waiting passively and effecting no retaliation. Besides, what was the use of being in possession of the key to the codes if he never took...

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  • In 2013, managing the security of devices, small business systems, and large enterprise networks will be more complex than ever before. Users are breaking down the PC monoculture by embracing a wider variety of platforms, each with its own user interface, OS, and security model. Businesses, meanwhile, are grappling with protecting intellectual property and business information as they tackle consumerization, virtualization, and cloud platforms head-on.

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  • Charging for Network Security Based on Long-Run Incremental Cost Pricing Pricing for the use of the networks is essential in the way that it should be able to reflect the costs benefits imposed on a network when connecting a new generator or demand and to provide forward-looking message to influence the site and size of future network customers. Studies have been extensively carried out over the years to achieve this pricing goal. Few methodologies can directly link nodal generation/demand increment to network long-run marginal/incremental costs.

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  • Network reconnaissance cannot be prevented entirely. If Internet Control Message Protocol (ICMP) echo and echo-reply is turned off on edge routers, ping sweeps can be stopped, but at the expense of network diagnostic data. However, port scans can easily be run without full ping sweeps; they just take longer because they need to scan IP addresses that might not be live. Intrusion detection systems (IDSs) at the network and host levels can usually notify an administrator when a reconnaissance attack is underway.

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  • Impersonation can come about from packet spoofing and replay attacks. Spoofing attacks involve providing false information about a principal’s identity to obtain unauthorized access to systems and their services. A replay attack can be a kind of spoofing attack because messages are recorded and later sent again, usually to exploit flaws in authenti- cation schemes. Both spoofing and replay attacks are usually a result of information gained from eavesdropping.

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  • Even though PEMis a landmark protocol in the development of secure messag- ing, and is also generally considered to be of sound technical design [29], it did not catch on. This was mainly due to two reasons. First, the message syntax that PEM describes was incompatible with the widely successful MIME message syntax that emerged at the same time [29, p. 156]. Secondly, the public-key management de- scribed by PEM restricted the Certificate structure [9, p. 51]. Namely, it required a top-down Certificate Authority (CA) approach.

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  • For Annex J “BACnet/IP” communication, each device on a BACnet/IP network “speaks IP”, also using UDP transport. The BACnet/IP network may include more than one IP subnet and be spread out over more than one physical location. Devices may send di- rected messages as well as broadcast messages just as in a normal BACnet network. However, since IP does not support broadcasts, a special device is required—the BACnet Broadcast Management Device (BBMD).

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