chapter 9  tomorrow s security cogs and levers

... anybody, and can be used to encrypt messages, and verify signatures a private-key, known only to the recipient, used to decrypt messages, and sign (create) signatures is asymmetric because  those ... both sender and receiver if this key is disclosed communications are compromised also is symmetric, parties are equal hence does not protect sender from receiver forging a message & claiming is sent ... (provide secrecy)  digital signatures (provide authentication)  key exchange (of session keys)  some algorithms are suitable for all uses, others are specific to one Security of Public Key Schemes...

Ngày tải lên: 06/03/2014, 16:20

... checksum or cryptographic hash function is sufficient Hash: This is a comma-separated list of hash algorithms used in the message This is used only in clear-signed messages Charset: This is a description ... These two schemes for text compression (generally referred to as lossless compression) are broadly used because they are easy to implement and also fast In 1982 James Storer and Thomas Szymanski ... message is also usually compressed The receiving PGP uses RSA with its private key to decrypt and recover the session key The receiving PGP decrypts the message using the session key If the message...

Ngày tải lên: 09/08/2014, 06:23

... the canvas as if you were using the Airbrush tool The Tool Options for this type of brush are based on Airbrush options, such as Spray Size and Density Examples of Airbrush based brushes include ... Cutting, pasting, and adding tone effects is easier and a lot less messy Plus (and this is something I’ll argue is most important), if you screw up, just delete the area (or whole layer) and start ... use tones What are tones, you ask? Dots Lots and lots of tiny dots Many artists who work in black and white, especially manga artists, swear by tones Until now, the only way to use screentones...

Ngày tải lên: 27/08/2012, 14:31

... auto transmissions, starters, and industrial machinery Spiral clutch bands can be purchased separately to fit the user s assembly Spiral bands direct the force inward as an outer ring drives counterclockwise ... MIL-E-5400, class and MILK-3926 specifications Applications were seen in counter and reset switches and controls for machines and machine tools, radar systems, and precision potentiometers Eight-Joint ... becomes overstressed The stress-misalignment relationship is given in Eq 2, which shows the maximum flat-wise bending stress produced when a plate is misaligned 1º and is then rotated to transmit...

Ngày tải lên: 22/10/2012, 14:26

... Symbols Steam system devices can be represented as symbols Figure 9.12 shows steam system symbols 225 Chapter ● Boilers Figure 9.12 Steam System Symbols T Steam Trap Boiler Summary Boilers—steam ... furnace is often split into two or more flows called passes These passes usually are referred to as the east, west, north, or south pass As the names suggest, each goes to a specific section of ... the pressure doubles Liquids and solids also respond to pressure increases but in much smaller 262 Pressure Measurement Gas Liquid Figure 11.4 Pressure Effects Figure 11.5 Pressure Elements proportions...

Ngày tải lên: 21/08/2013, 10:47

... Book defines all the system messages In short, system messages fall into the following categories: Application system messages Such a message concerns the application itself, and is delivered ... messages, a quick review of system messages will minimize confusion between how these different types of messages are handled System message handling When an application receives a system message, ... receives the message passes it to a handler object, which uses its version of MessageReceived() to carry out the message s action That leads to the distinction that a system message is usually handled...

Ngày tải lên: 17/10/2013, 19:15

... present significant issues, such as different band passes, using low water peak fiber, splitters for specific transmission ranges, and the need to accomplish testing in different band passes For ... BPON transports data at 622 Mbits/sec downstream and 155 Mbits/sec upstream A move to GPON would increase those rates to 2.4 Gbits/sec downstream and 1.2 Gbits/sec upstream GPON also provides for ... higher split ratios to service more homes A centralized BPON system uses 1x32 splitters to service up to 32 customers GPON offers a 1x64 split enabling up to 64 customers to be serviced from a single...

Ngày tải lên: 10/12/2013, 19:15

Ngày tải lên: 14/12/2013, 12:15

... Admissions Test (GMAT) scores The first thing university administrators want to know when students apply for admission is how well they did on standardized tests The tests are used to measure students’ ... ratio Lease agreements Balance statement—assets Supplies Prepaid items Utility deposits Assessed land value Personal property list Balance statement—liabilities Accounts payable Notes payable ... measure students’ knowledge and aptitude in various subjects, and the results are summarized in the form of a numeric score Just as administrators use these scores to set minimum standards for matriculation...

Ngày tải lên: 14/12/2013, 19:15

... Insurance Costs The cost of doing business is a constant worry for all firms At times, those business costs feed major policy debates in the nation s capital As is so often the case, the infamous “healthcare ... costs of an action (Then, there are some “costs” that are recognized on accounting statements that should not be considered in making business decisions These costs are called “sunk costs.” See ... meets a human need just as much as the profits they earn Some business people may even accept lower profits so their products can sell at lower prices and serve more people For most business people,...

Ngày tải lên: 17/12/2013, 15:19

... Solid bodies can be considered as systems with continuous distribution of matter The sums that are used for the calculation of the center of mass of systems with discrete distribution of mass become ... The Center of Mass: Consider a system of two particles of masses m1 and m2 at positions x1 and x2 , respectively We define the position of the center of mass (com) as follows: xcom = m1 x1 + ... The equations above show that the center of mass of a system of particles moves as though all the system 's mass were concetrated there, and that the vector sum of all the external forces were applied...

Ngày tải lên: 23/12/2013, 00:16

... in his answer, and forced his younger sister to be civil also, and say what the occasion required She performed her part indeed without much graciousness, but Mrs Bennet was satisfied, and soon ... themselves, and the Lucases are a very good sort of girls, I assure you It is a pity they are not handsome! Not that I think Charlotte so VERY plain—but then she is our particular friend.’ ‘She seems ... remains with us.’ Mrs Bennet was profuse in her acknowledgments ‘I am sure,’ she added, ‘if it was not for such good friends I not know what would become of her, for she is very ill indeed, and suffers...

Ngày tải lên: 26/01/2014, 14:20

... may also be expressed in terms of its symmetrical components as s s s I qs = I qs + + I qs − (9.5-31) s However, I as is zero, and since θ and I s are both zero, then I qs , which is I as , is zero ... V0 s )( I as + + I as − + I s ) + (Vbs + + Vbs − + V0 s )( I bs + + I bs − + I s ) + (Vcs + + Vcs − + V0 s )( I cs + + I cs − + I s ) (9.2-8) Uppercase letters are used to denote steady-state sinusoidal ... Because the stator circuit is a three-wire symmetrical system, i 0s and v 0s are zero Therefore, with s θ = 0, fqs = fas and s vas = vqs = p s ψ qs ωb (9.5-19) s From (6.5-28) with iqs = s ψ qs =...

Ngày tải lên: 16/02/2014, 18:48

... the existing local loops Topics discussed in this section: ADSL ADSL Lite HDSL SDSL VDSL 9.16 Note ADSL is an asymmetric communication technology designed for residential users; it is not suitable ... network started as a video service provider, but it has moved to the business of Internet access In this section, we discuss cable TV networks per se; in Section 9.5 we discuss how this network ... analog system using analog signals to transmit voice Topics discussed in this section: Major Components LATAs Signaling Services Provided by Telephone Networks 9.2 Figure 9.1 A telephone system...

Ngày tải lên: 16/02/2014, 20:20

... listSize] newAddress = (collisionAddress + offset) MOD listSize Cao Hoang Tru CSE Faculty - HCMUT 47 01 December 2008 Key Offset • The new address is a function of the collision address and the ... Linked List Resolution • Major disadvantage of Open Addressing: each collision resolution increases the probability for future collisions ⇒ use linked lists to store synonyms Cao Hoang Tru CSE Faculty ... Division Address = Key MOD listSize + • Fewer collisions if listSize is a prime number • Example: Numbering system to handle 1,000,000 employees Data space to store up to 300 employees hash(121267)...

Ngày tải lên: 06/03/2014, 17:20

... the business curriculum Diane Swanson is the von Waaden Professor of Business Administration at Kansas State University where she teaches undergraduate and graduate courses in Business and Society ... across disciplines who conduct research in business ethics and related fields The Symposium is designed to develop a number of Stern business ethics research fellows — research-active professors ... statements, visit classrooms, and share leading practices (successes and failures) Provide research and internship opportunities for faculty and students interested in the study of applied business...

Ngày tải lên: 06/03/2014, 19:20

... encryption and explain why it is Define encryption and explain why it is necessary necessary Identify risks and safeguards associated with Identify risks and safeguards associated with wireless communications ... software analyzes network traffic, assesses system vulnerabilities, and identifies intrusions and suspicious behavior Access control defines who can access computer and what actions they can take ... theft is act of stealing computer equipment     Cables sometimes used to lock equipment Some notebook computers use passwords, possessed objects, and biometrics as security methods For PDAs,...

Ngày tải lên: 07/03/2014, 14:20

... cytosol decreases, phosphate uptake into the chloroplast is inhibited and photosynthesis becomes phosphate limited (Geiger and Servaites 1994) Starch synthesis and sucrose synthesis decrease rapidly ... feature of the shady habitat is sunflecks, patches of sunlight that pass through small gaps in the leaf canopy and move across shaded leaves as the sun moves In a dense forest, sunflecks can change ... nutrients, the more light a crop receives, the higher the biomass (Ort and Baker 1988) Leaves Must Dissipate Excess Light Energy When exposed to excess light, leaves must dissipate the surplus absorbed...

Ngày tải lên: 07/03/2014, 20:20

... connections to less similar points The nearest neighbors of a point tend to belong to the same class as the point itself This reduces the impact of noise and outliers and sharpens the distinction ... regions of the space • Clusters have arbitrary shapes, orientation, and non-uniform sizes • Difference in densities across clusters and variation in density within clusters • Existence of special ... nodes and edges whose weights are the similarities between data points Sparsify the similarity matrix by keeping only the k most similar neighbors This corresponds to only keeping the k strongest...

Ngày tải lên: 15/03/2014, 09:20

... lot of confusion among developers, customers, and even authors In some cases, pieces H o w THIS W O R K S from the CSS3 specification such as shadows, gradients, and transformations are being ... to use CSS3 's shadows, gradients, and transformations, as well as how to learn how to work with fonts In the last section, we'll use HTML5 's client-side features such as Web Storage, Web SQL ... Databases, and offline support to build client-side applications We'll use Web Sockets to talk to a simple chat service, and you'll see how HTML5 makes it possible to send messages and data across...

Ngày tải lên: 21/03/2014, 12:00