digital signatures and authentication protocols

... Logarithms and ElGamal – Primitive elements and some more number theory (quickly) – DLOG – ElGamal, another Public Key Algorithm…  Digital Signatures: – The basic idea – RSA Signatures and ElGamal Signatures ... to forge and use elsewhere  Conventional signing can’t work in the digital world  We require a digital signature to satisfy: Digital signatures can’t be separated from the message and attached ... and m2, and use the same k, then the ciphertexts will be (r,t1) and (r,t2) – If Eve ever finds m1 then she has m2 also!!! t1 / m1 = β k = t / m ⇒ m = t m1 / t1 ( mod p ) Overview of Digital Signatures...

Ngày tải lên: 15/03/2014, 17:20

Ngày tải lên: 02/08/2014, 08:21

... “skull” and click OK Save and close your skull file Return to your gas mask file and define this image as a Brush preset too, by using the same Edit menu command Name this preset “mask” and click ... on your black stencil art Next, target your background layer and select the Magic Wand tool Add light and dark areas Adding light and dark areas within your stencil art helps to create a genuine ... Layers palette and select the Brush tool Press “d” to set the foreground color to black and then paint within the selection here and there on the new layer Alter brush opacity and diameter as...

Ngày tải lên: 17/10/2013, 20:15

... Layers palette and use the Magic Wand to select her face, neck, and hand regions that are surrounded by black outlines Leave the selection active and then target the underlying layer Expand the selection ... foreground color and fill the active selection with it Deselect and target the black layer again Use the Magic Wand to select her hair highlights Return to the underlying layer and expand the selection ... Control(PC)/Command(Mac)-g to group them Expand the group and Control(PC)/ Command(Mac)-click the bottom layer to load a selection from the layer’s contents Target the group and then click on...

Ngày tải lên: 20/10/2013, 11:15

... illustration, using different resource files and a different position on the canvas Use the hand.jpg and hand-thermal.jpg files for your first two channels and subsequent layers Then follow the process ... head Open up the band.jpg file and use the Polygonal Lasso tool to draw a polygonal selection around one of the band members Control(PC)/ Command(Mac)-click inside the selection and drag the contents ... contrived and the feeling of abandon is rarely even attempted The recklessness and abandon that the paint slingers take for granted is something that we Photoshop artists must carefully plan and calculate...

Ngày tải lên: 20/10/2013, 11:15

... the layer to multiply and move it down and to the right with the Move tool Duplicate this layer and then move it up and to the left a little And finally, duplicate this layer and use FreeTransform ... background, select all by typing Control(PC)/Command(Mac)-A and copy by typing Control(PC)/Command(Mac)-C 17 Return to your working file and type Control(PC)/Command(Mac)-V to paste the copied art into ... copy, and then paste the copied art into the working file as a new layer Select the Magic Wand tool and this time, disable the Contiguous option Leave all other Magic Wand settings as they were and...

Ngày tải lên: 24/10/2013, 10:15

... Control(PC)/Command(Mac)-A and copy by typing Control(PC)/Command(Mac)-C Return to your working file and, with the selection still active, paste into the active selection by typing Control(PC)/ Command(Mac)-Shift-V ... SelectϾModifyϾExpand from the menu and expand the selection by pixel If your current background color is not set to black, press the “d” key After expanding, type Control(PC)/Command(Mac)-Delete ... paint on your hands will help you snap out of the convenient and predictable Let’s make a bit of a mess and combine some real-world materials to give your collage a distinctly non -digital look...

Ngày tải lên: 24/10/2013, 10:15

... the corners and midpoint handles of the bounding box to increase the eye in size and alter the proportion so that it is larger and wider than the original Press Enter on the keyboard and then repeat ... precision And although in this chapter I’ll explain in detail, numerous ways to finesse your imagery as well as work with color and texture, layer stacking and duplication is essentially the nuts and ... white, click and drag to unmask areas of the layer, blending them back into visibility The key to successful masking is to add and remove as needed, drawing gradients and switching back and forth...

Ngày tải lên: 28/10/2013, 17:15

... adding details and signs of age to the right side of her face Work on the nose area, and add more pores and wrinkles Build up masked layers and remember to use color range, multiply, and the darken ... gradient opacity to 25% and then, while holding down the Shift key, click and drag from the top of the canvas down a little Do this from the bottom up, and then in from the left and right sides so ... channel set to CMYK and drag the left and right input level sliders closer to the center of the histogram Then select the black channel and perform a similar adjustment Click OK and target the adjustment...

Ngày tải lên: 28/10/2013, 17:15

... this layer and then change the blending mode to soft light and increase the layer opacity to 40% Duplicating and altering As you create the effect of the sky overlapping his head and shoulders, ... darken and Load the path as a selection and then open up the background.psd file again Use the Rectangular Marquee to select a section of the painting and copy it Return to your working file and ... drips and splatters, 214–215 layer moves advice, 209 layers stacking and blending, 208 markers and ink, 196–198 media, 217 overview, 191 practical application, 216 resource creation, 197 shading and...

Ngày tải lên: 07/11/2013, 12:15

... this layer, and then change the blending mode to luminosity Again, duplicate this layer and then change the blending mode to soft light and increase the layer opacity to 40% Duplicating and altering ... darken and Load the path as a selection and then open up the background.psd file again Use the Rectangular Marquee to select a section of the painting and copy it Return to your working file and ... drips and splatters, 214–215 layer moves advice, 209 layers stacking and blending, 208 markers and ink, 196–198 media, 217 overview, 191 practical application, 216 resource creation, 197 shading and...

Ngày tải lên: 07/11/2013, 12:15

... Distribution Trees and Control Protocols 2-23 Dense Mode protocols implement the “PUSH” model for multicast data delivery This model is also called broadcast and prune or flood and prune because ... mode and sparse mode intradomain protocols n Determine the current situation and protocols for interdomain multicasting Copyright © 2000, Cisco Systems, Inc IP Multicast Distribution Trees and ... Path Tree (SPT) between a source Source1 and receivers Receivers1 and Receiver2 We assume that the path between source and receivers over routers A, C and E is the path with the lowest cost Packets...

Ngày tải lên: 11/12/2013, 14:15

... as broadcast frames, and excessive broadcasts reduce bandwidth for end users Later in this chapter, we’ll examine how to manage GNS requests and SAPs Networking and Desktop Protocols ○ ○ ○ ○ ○ ... the IPX model Answers a and b are incorrect, because EIGRP IPX and IPX are layer protocols Answer c is incorrect, because UPX is an invalid protocol Networking and Desktop Protocols 35 ○ ○ ○ ○ ... because it has no network layer addressing Answers a and b are incorrect, because IP and IPX are routable protocols Networking and Desktop Protocols 41 ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○...

Ngày tải lên: 21/12/2013, 19:15

... certificate A digital signature isn't absolute proof that the person is who he says he is Anyone can make up a name and get a digital signature However, if it's someone you know and trust, a digitally ... certificate, use Import/Export to install your digital ID If you need a digital signature, choose Get a Digital ID This opens your Internet browser to a list of digital ID providers who partner with Microsoft ... settings, choose the New button and type a new name in the name field Your digital signature is ready to use Task: Send Signed and Encrypted Messages After you've obtained a digital certificate, signing...

Ngày tải lên: 21/01/2014, 02:20

... certificate A digital signature isn't absolute proof that the person is who he says he is Anyone can make up a name and get a digital signature However, if it's someone you know and trust, a digitally ... certificate, use Import/Export to install your digital ID If you need a digital signature, choose Get a Digital ID This opens your Internet browser to a list of digital ID providers who partner with Microsoft ... settings, choose the New button and type a new name in the name field Your digital signature is ready to use Task: Send Signed and Encrypted Messages After you've obtained a digital certificate, signing...

Ngày tải lên: 21/01/2014, 02:20

Ngày tải lên: 24/01/2014, 19:20

... edge is that he won’t stand still, and this new edition of his book brings the proof Despite the magic of Photoshop, digitally retouched images often leave viewers cold, and to combat this, many ... working digitally There are endless filters and niche applications out there that promise convincing results However, quick fixes and prefab effects often are disappointing When you are painting digitally, ... left handed, try rotating the angle in the Brushes palette You can specify any angle you like, and this angle will likely vary from preset to preset Try starting somewhere between 37° and 45° and...

Ngày tải lên: 26/01/2014, 09:20

... they have taken advantage of: • Blogs, Facebook, and Twitter were used to transmit commands from command -and- control servers • Google Docs, Dropbox, and Pastebin served as drop zones for exfiltrated ... visibility, insight, and control needed to combat APTs and targeted attacks Consider solutions that can detect and identify evasive threats in real time and provide in-depth analysis and relevant actionable ... further expand opportunities for cybercriminals and other threat actors to gain profit, steal information, and sabotage their targets’ operations Our 2013 forecasts: The volume of malicious and high-risk...

Ngày tải lên: 17/02/2014, 21:20

... Aceite de la Comunitat Valenciana Aceite de Madrid Andalucía Andalucía Andalucía Andalucía Andalucía Andalucía Andalucía Andalucía Andalucía Andalucía Andalucía Extremadura Extremadura Castilla-La ... related to the aroma and flavor, such as hydrocarbons, alcohols, aldehydes, esters, phenols, terpenes and furan derivates (Boskou 1996; Morales and Aparicio 1999 and 2003; Reiners and Grosch 1998) ... Matrices and MLR Models 9.5 Prediction of OFA Concentration in VOOs Using FTIR and MLR 9.5.1 Description of FTIR Spectra and Construction of Data Matrices and...

Ngày tải lên: 07/03/2014, 21:20

... formats; and the long-term issues of sustainability, user assessment, digital asset management and preservation Investigate and declare intellectual property rights and ownership Ownership and rights ... imagined and by future applications that will dynamically recombine digital objects’ into new resources They can ensure the quality, consistency and reliability of a project’s digital resources and ... standards These include the Text Encoding Initiative’s Guidelines for Electronic Text Encoding and Interchange, Cornell University Library’s Digital Imaging for Libraries and Archives, the Digital...

Ngày tải lên: 08/03/2014, 14:20