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Experiment five Java network programming and security

!"; Keygenerator kg=keygenerator.getinstance ("Desede"); Kg.init (168); Secretkey K=kg.generatekey (); Byte[] kb=k.getencoded (); FileOutputStream fk=new fileoutputstream ("Keykb1.dat"); Fk.write (KB); for (int i=0;i3. Then print the plaintext, convert to UTF8 format, and encrypt the plaintext with the secret key.Cipher cp=cipher.getinstance ("Desede"); Cp.init (Cipher.encrypt_mode, k);

PSO Algorithm for solving optimization problems (MATLAB)

(Globalbest_faval) Break,Endk=k+1;Endvalue1=1/globalbest_faval-1; Value1=num2str (Value1);% strcat instruction enables combination output of charactersdisp(Strcat (' The maximum value ',' = ', Value1));the horizontal axis position where the maximum output value isvalue2=globalbest_x; Value2=num2str (Value2);disp(Strcat (' The corresponding coordinate ',' = ', Value2)); x=-5:0.01:5; y=2.1*(1-x+2*x.^2).*Exp(-x.^2/2);p lot (x, Y,' m ',' LineWidth ',3); hold On;plot (globalbest_x,1/globalbest_faval

After viemu is installed in Visual Studio, vim vax shortcut keys are complete, viemuvim

, because some of the upper-case letters are occupied by VIM. The register command is double quotation marks. For example, we want to copy the current row to register k. You should press "kyy. (You can also use V "ky. Why ?) Now the current row should already exist in register k until you copy something into Register k. Now you can use the "kp" command to paste the content in register k to the desired position. Avoid repetition Amazing. Command In VI,

Python Data Structure Learning notes (ix)

parent node. Assuming that the new node is p, his parent node is Q, and if KP Now to remove_min the realization. To ensure the complete nature of the tree, you can first swap the root node with the rightmost node in the bottom layer, and then delete the node at the bottom right. This is possible to destroy the child node key is not less than the nature of the parent node. The method of maintenance is similar to insertion, starting at the root node, a

Windows view port occupancy and close the appropriate process

:2929 117.79.91.18:80 established 4732TCP 192.168.3.230:2930 117.79.91.18:80 established 4732TCP 192.168.3.230:2931 117.79.91.18:80 established 47322. View the usage of the specified portc:\>netstat-aon|findstr "9050"Protocol local address external address state PIDTCP 127.0.0.1:9050 0.0.0.0:0 LISTENING 2016P: See, Port is occupied by process number 2016 process, continue to execute the following command: (You can also go to the task Manager to see the PID corresponding process)3. View the PID c

Vsftpd configuration SSL encryption FTP Data Transmission

FTP is a File Transfer Protocol widely used on the Internet. Its disadvantage is that it transmits data in plaintext. It can easily obtain users and passwords by listening on nodes that pass through the data, which brings many risks to the installation, you can use SSL to encrypt the FTP connection. First, test the use of Tcpdump to listen to the ftp user name and password for plaintext transmission: tcpdump port 21-nA20: 03: 43.077038 IP 192.168.1.1.34453> 192.168.1.4.21: Flags [P.], seq, ack 1

Javascript drop-down menu language options simple implementation _ javascript skills

{background-position:-36px-1364px}. Flag-it {background-position:-36px-1395px}. Flag-jm {background-position:-36px-1426px}. Flag-jo {background-position:-36px-1457px}. Flag-jp {background-position:-36px-1488px}. Flag-ke {background-position:-36px-1519px}. Flag-kg {background-position:-36px-1550px}. Flag-kh {background-position:-36px-1581px}. Flag-ki {background-position:-36px-1612px}. Flag-km {background-position:-36px-1643px}. Flag-kn {background-position:-36px-1674px}. Flag-

Java RSA Plus decryption and purpose

following:ImportJava.io.FileInputStream;ImportJava.io.FileOutputStream;ImportJava.io.ObjectInputStream;ImportJava.io.ObjectOutputStream;ImportJava.math.BigInteger;ImportJava.security.KeyPair;ImportJava.security.KeyPairGenerator;ImportJava.security.PrivateKey;ImportJava.security.PublicKey;ImportJava.security.interfaces.RSAPrivateKey;ImportJava.security.interfaces.RSAPublicKey;Importorg.apache.commons.codec.binary.Base64; Public classRsautils {/*** Generate public and private keys, typically once

Introduction to the principle of ECC encryption algorithms

in the same straight line, their sum is equal to zero yuan, that is, A + B + C = O ∞ ▲K same vertices P are added, and we are recorded as KP. For example, P + P = 2 p + P = 3 p. Next, we use the coordinates of p and q points (x1, Y1), (X2, Y2) to obtain the coordinates of R = p + q (X4, Y4 ).Example 4.1: Obtain the elliptic curve equation y2 + a1xy + a3y = X3 + a2x2 + a4x + A6. The common points are P (x1, Y1), Q (X2, Y2) and the coordinates of R (X

Usage of Turbo C 2.0 and Its configuration in editplus

information about the Turbo C 2.0 editing command.F5 expands the editing window to the entire ScreenF6 switch between the editing window and the Information WindowF10 go from the editing window to the main menuEdit command introduction:Pageup front flipPagedn flip backHome move the cursor to the beginning of the rowEnd move the cursor to the end of the rowCTRL + y Delete the row where the cursor is locatedCTRL + T delete a word at the cursorCTRL + kb set block startCTRL + kkCTRL + kv Block Move

MATLAB compiler settings

First, enter: Mbuild-Setup Then several existing compilers (such as Vc) are displayed) However, if you select one of them, the following problems may occur: Usage:Mbuild [option1... optionn] sourcefile1 [... sourcefilen][Objectfile1... objectfilen] [libraryfile1... libraryfilen][Exportfile1... exportfilen]Use the-help option for more information, or consult the MATLAB CompilerUser's Guide.C: \ progra ~ 1 \ MATLAB \ r2012a \ bin \ Mex. Pl: Error: No file names given.Undefined function or variable

Java reads XML with dom4j

); iterator iter = List. iterator (); While (ITER. hasnext () {element Ep = (element) ITER. next (); For (iterator it = EP. attributeiterator (); it. hasnext ();) {attribute = (attribute) it. next (); string name = attribute. getname (); string value = attribute. getvalue (); sb. append ("" + name + "=" + value);} sb. append ("\ r"); iterator iterss = EP. elementiterator ("material"); While (iterss. hasnext () {element Kp = (element) iterss. next ();

Depressing LOKI: smartptr

Recently, the project needs to manage resources in multiple threads. Naturally, it comes to the idea of using smart pointers with reference counting technology to construct a garbage collection and recycling mechanism. The first consideration is the use of smartptr in Loki, which is already running in the project. Now we can see that Loki: smartptr is not as flexible as we think. The problem is that the constructor of smartptr (uses the original pointer to construct a smart pointer object ):Smar

Domain name and country table

. Er-Eritrea . Es-Spain . Et-Ethiopia . Fi-Finland . Fj-Fiji . Fk-Falkland Islands (Malvinas) . FM-Micronesia, Federal State . Fo-Faroe Islands . Fr-France . Ga-Gabon . GB-United Kingdom . Gd-Grenada . Ge-Georgia . GF-French Guiana . GG-Guernsey . Gh-Ghana . Gi-Gibraltar . Gl-Greenland . GM-Gambia . Gn-Guinea . GP-Guadeloupe . GQ-Equatorial Guinea . Gr-Greece . GS-South Georgia and the South Sandwich Islands . GT-Guatemala . Gu-Guam . GW-Guinea-Bissau . Gy-Guyana . HK-Hong Kong . Hm-heard and M

HDU 3342 legal or not (topological sorting)

Legal or not Time Limit: 2000/1000 MS (Java/others) memory limit: 32768/32768 K (Java/Others)Total submission (s): 3151 accepted submission (s): 1432Problem descriptionacm-DIY is a large QQ group where your excellent acmers get together. it is so harmonious that just like a big family. every day, daily "holy cows" like HH, HH, AC, ZT, KP, BF, qinz and so on chat on-line to exchange their ideas. when someone has questions,Export warm-hearted cows like

Key records without hooks

//************************************** ******************************** // Version: V1.0 // Coder: wineggdrop // Date release: NULL // Purpose: hookless keylogger // Test Platform: Win 2 K Pro and Server SP4 // Compiled on: KP 3.0, may compile on VC ++ 6.0 (not test yet) // Limitation: more usage of system resource; may not work on Win9x // Advantage: hookless technique fools anti-keylogger programs //************************************** *********

String, strngbuffer, stringbulider

(oldchar, newchar); // if the character to be replaced does not exist, the original string is returned.5. Cut: String [] Split (RegEx );6. substring. Obtain a part of the string.String substring (BEGIN); // starts from the specified position and endsString substring (begin, end); // contains the header, not the end. 7. Convert, remove spaces, and compare. 7.1 convert the string to uppercase or lowercase.String touppercase ();String tolowercase ();7.2 remove multiple spaces at both ends of the s

Wineggdrop backdoor V1.0 source code

//************************************** ********************************// Version: V1.0// Coder: wineggdrop// Date release: NULL// Purpose: to demonstrate some portless backdoor Technique// Test Platform: Win 2 K Pro and Server SP4// Compiled on: KP 3.0, may compile on VC ++ 6.0 (not test yet)//************************************** ******************************** # Include # Include # Include // Some structures to define# Define ip_hdrincl 2# Def

Efficient editor vim-operation [reprinted]

register K. You should press "kyy. (You can also use v "Ky. Why ?) Now the current row should already exist in register K until you copy something into Register K. Now you can use the "kp" command to paste the content in register K to the desired position. Avoid repetition Amazing. Command In VI, input. (decimal point) will repeat the previous command you entered. For example, if your last command is "DW" (delete a word), VI will delete another word.

UV-1156 pixel shuffle (Replacement + simulation)

andJIs the column number. The pixel at the upper left corner is at row 0 and column 0. The second line is a non-empty list of at most 32 words, separated by spaces. valid words are the keywordsid, rot, sym, bhsym, bvsym, Div and mix, or a keyword followed ''-". each keyword key designates an elementary transform (as defined by Figure 1), andkey-designates the inverse of transform key. for instance, rot-is the inverse of counter-clockwise 90o rotation, that is clockwise 90o rotation. finally, th

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