edx negotiation

CauseBy default, a registered user of studio can create a course that does not appear to be the usual usage scenario, and the platform owner prefers a review to allow the user to publish the courseIdeasRead the wiki!!For the novice who is tossing edx, I think the first job is two points:1. Let the platform run up2. Read through the wiki (configuration wiki and edx-platform wiki)If you read through the wiki,

analysis, we can find that the " 0x000f000f" operation is not required:X = DWORD () 0x11111111; // 000g 000 h 000e 000f 000c 000d 000a 000bX = bswap (x); // 000a 000b 000c 000d 000e 000f 000g 000 hX = (X | (x> 3) 0x03030303; // 0000 00ab 0000 00cd 0000 00ef 0000 00ghX = (X | (x> 6); // 0000 00ab 0000 ABCD 0000 00ef 0000 efghX = (byte) (X | (x> 12); // 0000 00ab 0000 ABCD 00ab 00ef ABCD efgh The corresponding assembly code is:; X = DWORD (); // 000g 000 h 000e 000f 000c 000d 000a 000b; MoV eax

process, if not, naturally do not need to decrypt. 012b2a4c |.　　8b45 0C mov eax,dword ptr ss:[ebp+c] 012b2a4f |.　　8B48 mov ecx,dword ptr ds:[eax+4] 012b2a52 |.　　8B51 mov edx,dword ptr ds:[ecx+4] 012b2a55 |.　　8b45 0C mov eax,dword ptr ss:[ebp+c] 012b2a58 |.　　8B48 mov ecx,dword ptr ds:[eax+4] 012b2a5b |.　　8B41 mov eax,dword ptr ds:[ecx+4] 012b2a5e |.　　8b4d 0C mov ecx,dword ptr ss:[ebp+c] 012b2a61 |.　　8d4401 Lea Eax,dword ptr ds:[ecx+eax+> 01

Due to historical reasons, one of the problems with deploying L2 Tunneling Protocol (L2TP/IPSec) with Internet Protocol Security is that the IPsec dialogs after Network Address Translation (NAT) cannot be located. Internet service providers and small office/Home Office (SOHO) networks usually use NAT to share a single public IP address. Although Nat helps to save the remaining IP address space, it also brings problems to end-to-end protocols such as IPSec. A new technology called IPSec NAT trave

I read an article on IAT encryption processing. I learned how to fix IAT after arriving at OEP. If there is any error, please advise.Copyright: evilangel Test shell is The original program kryton The Krypter [v.0.2] I. Shell check: PEiD shell check:Kryton 0.2-> Yado/Lockless 2. Arrive at OEP First, load the OD, ignore all exceptions, and stop 00434000> 8B0C24 mov ecx, [esp]; Kernel32.7C81702700434003 E9 0A7C0100 jmp 0044BC1200434008 AD lods dword ptr [esi]00434009 42 inc edx0043400A 40 inc eax00

, the application should assign the eax register a value of H and execute the cpuid command: MOV EAX, 80000000HCPUID After the execution is complete, the results will be saved in the eax register. To return valid CPU extension information, the eax register should always pass a value greater than or equal to H and less than or equal to the value of the result. In any case, if the value passed to eax is greater than the maximum value it can accept, or the function that returns the extended informa

defines how security services (such as encryption) are used between entities) communication. It consists of the following elements: 1) security parameter index SPI; 2) IP destination address; 3) security protocol.Sa is a one-way logical connection. That is to say, in one communication, IPSec needs to establish two SAS, one for inbound communication and the other for outbound communication. If a host, such as a file server or remote access server, needs to communicate with multiple clients at th

communications between the two parties; in the second phase, an IPSec SA is established using an established IKE SA. Completing these services in two phases helps to increase the speed of key exchange. First-stage negotiation (main mode negotiation) step:1. Policy negotiation, in this step, the four mandatory parameter values are negotiated:1 encryption algorith

Configuration of the Linux network card rate and duplex mode(2012-09-06 14:39:57)reproduced Tags: technology network Interface Negotiation Network card tool it Category: Linux tools to change the speed of network interfaces and Negotiate methodsMiitooland theEthtoolThrough the Mii-tool and Ethtool tools to adjust the speed of the network card, duplex, etc., this can improve the efficiency of the network card;Mii-too

From http://zerray.com/ Looking at the hooks in Win32 compilation, I was wondering how to write a whole-person program that changed the keyboard layout. Check the information and find that the underlying keyboard hook (wh_keyboard_ll) can be implemented. First, install and uninstall the HOOK: Installhook proc hins: DWORDInvoke setwindowshookex, wh_keyboard_ll, ADDR keyproc, hins, nullMoV hhook, eaxRETInstallhook endp Uninstallhook procInvoke unhookwindowshookex, hhookRETUninstallhook endp Like

will only press the parameter stack and then call it, but this is not the form of _ fastcall. it is also because it does not support _ fastcall, which makes assembly and other languages (such as C) mixed programming difficult once _ fastcall is involved. We all want to adopt some strategies to make MASM support the _ fastcall call method. In other words, it enables MASM to define and call functions of the _ fastcall type. To achieve this goal, we must first understand the characteristics of t

:{0040c230 push EBP0040c231 mov EBP, ESP0040c233 sub ESP, 60 h0040c236 push EBX0040c237 push ESI0040c238 push EDI0040c239 Lea EDI, [ebp-60h]0040c23c mov ECx, 18 h0040c241 mov eax, 0 cccccccch0040c246 rep STOs dword ptr [EDI]31: mostbase1 * pbase1 = pderived;0040c248 cmp dword ptr [EBP + 8], 0 [1]0040c24c jne f + 27 h (0040c257)0040c24e mov dword ptr [ebp-18h], 0 [2]0040c255 jmp f + 35 h (0040c265)0040c257 mov eax, dword ptr [EBP + 8]0040c25a mov ECx, dword ptr [eax] [3]0040c25c mov

again!" In this error dialog box today !" . Start OllyDBG, select the menu File> open the CrackMe3.exe file, and we will stop here: In the Disassembly window, right-click a menu and choose search> all reference text strings and click: Of course, it is more convenient to use the above super string reference + plug-in. However, our goal is to be familiar with some OllyDBG operations. I will try to use the built-in functions of OllyDBG with less plug-ins. Now, in another dialog box, right-click

choose search> all reference text strings and click: Of course, it is more convenient to use the above super string reference + plug-in. However, our goal is to be familiar with some ollydbg operations. I will try to use the built-in functions of ollydbg with less plug-ins. Now, in another dialog box, right-click it, select the "Search Text" menu item, and enter "Wrong serial, try again !" The start WORD "wrong" (note that the search content is case-sensitive) to find one: Right-click

========================================================== ========================================================== ====004991B1 call rtcRandomNext004991B7 fmul dbl_403920004991BD call _ vbaFpI4004991C3 mov dword_4D1030, eax; random number R1004991C8 lea ecx, [ebp-98h]004991CE call _ vbaFreeVar004991D4 mov dword ptr [ebp-4], 0Eh004991DB mov dword ptr [ebp-90h], 80020004 h004991E5 mov dword ptr [ebp-98h], 0Ah004991EF lea ecx, [ebp-98h]004991F5 push ecx004991F6 call rtcRandomize004991FC lea ecx,

Codefunction Strtohex (Const str:ansistring): ansistring;AsmPush EBXPush ESIPush EDITest Eax,eaxJZ @ @ExitMOV Esi,edx//Save the EdX value, the address used to generate the new stringMOV edi,eax//Save original stringMOV edx,[eax-4]//Get string lengthTest Edx,edx//Check length

Virus program source code instance analysis-CIH virus [3] code, you need to refer to the jmp ExitRing0Init; exit Ring0 level 　　 ; Size of the merged code CodeSizeOfMergeVirusCodeSection = offset $ 　　 ; New IFSMgr_InstallFileSystemApiHook function call InstallFileSystemApiHook: Push ebx 　　 Call @ 4 　　 @ 4: Pop ebx; get the offset address of the current command Add ebx, FileSystemApiHook-@ 4; the offset difference is equal to the offset of FileSystemApiHook. 　　 Push ebx Int 20 h; call Vxd to remov

". Find the strings below: 004E7F29 ASCII "newunit"004E7F6B mov edx, 123.004E8270 ASCII "book. mdb" → this file is generated in the directory after being decompressed!004E8045 PUSH 123.004E82F4 ASCII "book. mdb"004E809E PUSH 123.004E8208 ASCII ". mdb"004E80D9 PUSH 123.004E8218 ASCII "Provider = Microsoft. Jet. OLEDB.4.0; Data Source ="004E80E1 PUSH 123.004E8350 ASCII "; Jet OLEDB: Database Password ="004E80E6 PUSH 123.004E8378 ASCII "muae0115"004E80EB

Protection Mechanism [Statement]I write articles mainly for communication, and hope that you can maintain the integrity of the article during reprinting. [Preface]This time I focused on the protection mechanism and did not write any shell removal method. In fact, I have misled many kind audiences. The most important thing to know about a shell software is its protection mechanism, which I learned later. The following describes some protection mechanisms. This is only for everyone and me to lear

-click a menu and choose search> all reference text strings and click: Of course, it is more convenient to use the above super string reference + plug-in. However, our goal is to be familiar with some ollydbg operations. I will try to use the built-in functions of ollydbg with less plug-ins. Now, in another dialog box, right-click it, select the "Search Text" menu item, and enter "Wrong serial, try again !" The start WORD "wrong" (note that the search content is case-sensitive) to find one: