rot cipher

Experiment one, traditional cipher algorithm I. Objectives and tasks of the experiment By programming to realize the substitution cipher algorithm and the substitution cipher algorithm, deepen the understanding to the classical cipher system, lays the foundation for the Deep Study cryptography Second, the experimental

RSA Algorithm Description: 1. p and q are not equal. They are two prime numbers that are large enough. P and q are confidential. 2. n = p * q n is public. 3, f (n) = (p-1) * (q-1) 4. e is the prime number of mutual quality with f (n ). 5. Calculated parameter d 6. After five steps above, the public key KU = (e, n) Private Key KR = (d, n) is obtained) The following two articles clearly describe this: Http://wenku.baidu.com/view/e53fbe36a32d7375a417801b.html Http://bank.hexun.com/2009-06-24/11895

FiberPortswitchPort Link-type TrunkPort Trunk Permit VLAN 1 10#Interface GIGABITETHERNET0/0/8Combo Enable FiberIP address 202.100.25.166 255.255.255.192Nat EnableDetect FTP#Interface NULL0#Firewall Zone LocalSet Priority 100#Firewall Zone TrustSet Priority 85Add Interface gigabitethernet0/0/0Add Interface GIGABITETHERNET0/0/4Add Interface GIGABITETHERNET0/0/7Add Interface Virtual-template1Add Interface Vlanif10#Firewall Zone UntrustSet Priority 5Add Interface GIGABITETHERNET0/0/8#Firewall Zone

black border to the widget! ");}}7. Scroll bar DecoratorPackage Decorator;/** Created by jiqing on 2016/10/14.*/public class Scrollbardecorator extends componentdecorator{Public Scrollbardecorator (Component Component) {Super (component); Calling the parent class constructor} public void display () {This.setscrollbar ();Super.display ();}public void Setscrollbar () {SYSTEM.OUT.PRINTLN ("Add scroll bar for widget! ");}}8. Client CallsPackage Decorator; Decorator mode/** Cr

Nodejs's crypto module public key encryption and decryptionNodejs has the following 4 classes related to public key cryptography.1. Cipher: Used for encrypting data;2. Decipher: Used to decrypt data;3. Sign: Used to generate signatures;4. Verify: Used to verify the signature;When using public key cryptography, public and private keys are used to create encrypted data that only the owner of the private key can read, and to authenticate the signature of

AES encryption tool, Public class AES { /*** Encryption** @ Param content* Content to be encrypted* @ Param password* Encrypted password* @ Return*/Public static byte [] encrypt (String content, String password ){Try {KeyGenerator kgen = KeyGenerator. getInstance ("AES ");Kgen. init (128, new SecureRandom (password. getBytes ()));SecretKey secretKey = kgen. generateKey ();Byte [] enCodeFormat = secretKey. getEncoded ();SecretKeySpec key = new SecretKeySpec (enCodeFormat, "AES ");

How to Prevent 1024-bit Diffie-Hellman from being cracked On Wednesday, Researchers Alex Halderman and Nadia Heninger proposed that NSA has been able to decrypt a large number of HTTPS, SSH, and VPN connections by attacking a 1024-bit prime number Diffie-Hellman Key Exchange algorithm. NSA may have cracked 1024-bit Diffie-Hellman Logjam attacks discovered in the first half of this year allow a hacker using man-in-the-middle attacks to reduce the output level of the TLS link encryption algorithm

How to Prevent 1024-bit Diffie-Hellman from being cracked On Wednesday, Researchers Alex Halderman and Nadia Heninger proposed that NSA has been able to decrypt a large number of HTTPS, SSH, and VPN connections by attacking a 1024-bit prime number Diffie-Hellman Key Exchange algorithm. NSA may have cracked 1024-bit Diffie-Hellman Logjam attacks discovered in the first half of this year allow a hacker using man-in-the-middle attacks to reduce the output level of the TLS link encryption algorithm

. yue; import java. io. IOException; import java. security. secureRandom; import javax. crypto. cipher; import javax. crypto. secretKey; import javax. crypto. secretKeyFactory; import javax. crypto. spec. DESKeySpec; import Decoder. BASE64Decoder; import Decoder. BASE64Encoder; public class DesUtil {private final static String DES = DES; public static void main (String [] args) throws Exception {String data = 123 456; String key = abcdefgh; System. er

/* Des Java Complied OK with eclipse Create a desencrypt class, copy the following code, and compile it. */Import java. Security. Key;Import java. Security. securerandom;Import javax. crypto. cipher;Import javax. crypto. keygenerator; Import sun. Misc. base64decoder;Import sun. Misc. base64encoder; /**** Use des to encrypt and decrypt byte [] and string types.* The ciphertext can be stored using string, byte.** Method:* Void getkey (string strkey) gen

consistent with the background) Paste the Code directly: For IOS, You need to introduce GTMBase64.h, GTMBase64.m, and GTMDefines. h. I found this on github and I will search for it myself, as well as # Import "ViewController. h "# import Java code: Introduce sun. misc. BASE64Decoder. jar by yourself. Package com. yue; import java. io. IOException; import java. security. secureRandom; import javax. crypto. cipher; import javax. crypto. secretKey;

1. MD5 is not described here. For details, refer to subsequent articles. 2. DES data encryption: Import java. io. UnsupportedEncodingException; Import java. security. SecureRandom; Import javax. crypto. Cipher; Import javax. crypto. SecretKey; Import javax. crypto. SecretKeyFactory; Import javax. crypto. spec. DESKeySpec; Public class test { Public static void main (String [] args) Throws UnsupportedEncodingException { // Content to b

(This article only saves copies) Original http://edu.yesky.com/edupxpt/64/2182064.shtml In view of the importance of RSA encryption and the lack of relevant source code, it is hereby posted. Need to download the bcprov-jdk14-123.jar. Import javax. crypto. cipher; Import java. Security .*; Import java. Security. spec. rsapublickeyspec; Import java. Security. spec. rsw.vatekeyspec; Import java. Security. spec. invalidkeyspecexception; Import java

is twice the inner circle radius, so you only need to input a small r. Call a startPath () function in drawStar to draw a standard five-star path. Standard Five-star path: Only one context is input, and a large circle radius of 1 is drawn at (0, 0) without any offset or any rotation of the five-star. After the standard pentagram is drawn in drawStar, the displacement of the standard pentagram is changed to the position (x, y) Through graphical transformation. The size is changed to R, and the

Cl;H = 1; % index the first element in the PIX, that is, the heightW = 2; % index the second element in the PIX, that is, the width.Jiaodu = 45; % rotation angle, clockwiseImg1_imread('corner.png '); % here V is the height of the original image, U is the width of the original imageImshow (IMG); % here Y is the height of the transformed image, and X is the width of the transformed Image[V u] = size (IMG );Theta = jiaodu/180 * PI;Rot = [cos (theta)-sin

) * Y (3); 0 0 0 x (3) y (3) 1-y (3) * X (3) -Y (3) * Y (3); X (4) y (4) 1 0 0 0-X (4) * X (4)-X (4) * Y (4); 0 0 0 x (4) y (4) 1-y (4) * X (4)-y (4) * Y (4)]; fa = inv (a) * B; % the solution of the equation obtained by four points is also the global transformation coefficient A = FA (1); B = FA (2 ); C = FA (3); D = FA (4); E = FA (5); F = FA (6); G = FA (7 ); H = FA (8); rot = [d e f; a B C; G H 1]; % in the formula, the first number is X, and the

When the program encountered triangular function when I was confused, so Baidu "junior trigonometric Functions",Forget about these formulas, and punch yourself in the face.The goal is to draw a pentagram through canvas,Breakthrough: As long as the radius of the given two outer punctuate, and the radius of the inner punctuate, with the above formula to calculate the coordinates of each pentagram point.The main code is as follows:"300" means the radius of the outer ring."150" refers to the radius

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Java source code: {code...} Source: www. cnblogs. commailin... Java source code: Import java. security. security; import javax. crypto. cipher; import javax. crypto. secretKey; import javax. crypto. spec. secretKeySpec; public class ThreeDES {private static final String Algorithm = "DESede"; // defines the encryption Algorithm. DES, DESede, Blowfish // keybyte can be used as the encryption key, the length is 24 bytes // src is the encrypted data buff

Symmetric encryption algorithmDefinition: In the symmetric encryption algorithm, the sender of the data sends the plaintext (raw data) and the encryption key (Mi Yue) together with a special encryption algorithm, which makes it into a complex cipher cipher. After receiving the ciphertext, if you want to interpret the original text, it is necessary to decrypt the ciphertext by using the encryption key and th