rot cipher

AES encryption and decryption, AES is a type of symmetric encryption. It is simply understood that there is only one key, and it is used for encryption and decryption. The security is not very good. Package com. aisino. qysds. common. util; import java. io. unsupportedEncodingException; import java. security. invalidKeyException; import java. security. noSuchAlgorithmException; import java. security. secureRandom; import java. util. random; import javax. crypto. badPaddingException; import javax

AES encryption algorithm, user-sensitive information encryption, and aes Encryption Algorithm /*** AES is a reversible encryption algorithm that encrypts users' sensitive information and performs Base64 encoding and conversion after the original data is encrypted by AES;*/Public class AESOperator {/** The Encrypted Key can consist of 26 letters and numbers. Here the AES-128-CBC encryption mode is used, and the key needs to be 16 characters. 0021XdSh0021XdSh*/Private String sKey = "10d2Xd4hf0s1Xv

to grasp the following knowledge points: Basics: Bit bits, bytes, characters, character encodings, incoming transformations, IO Know how to use symmetric encryption to solve problems in actual development Know symmetric encryption, asymmetric encryption, message digest, digital signature, digital certificate is to solve the problem of what happened Understanding the SSL communication process How to request HTTPS interface in actual development Caesar Code 1. Introduce

First, we can see: plaintext ---> Public Key ---> ciphertext --> key --> plaintext RSA greatly improves file security because of the differences between public key RSA algorithm: ImportJava. Security. Key; ImportJava. Security. keyfactory; ImportJava. Security. keypair; ImportJava. Security. keypairgenerator; ImportJava. Security. privatekey; ImportJava. Security. publickey; ImportJava. Security. Interfaces. rsw.vatekey; ImportJava. Security. Interfaces. rsapublickey; ImportJava. Sec

Recently saw an article detailing how the German Enigma machine was cracked during World War Ii. Enigma machine is essentially encrypted using the principle of substitution cipher.1) The principle of replacement encryption and the method of crackingIn ancient times, when people wanted to encrypt a piece of text, the letters in the original text (that is, the plaintext) were replaced with other letters according to some kind of pairing, thus obtaining

),..., until (255,255,255 ). In this way, the grayscale image can be represented by a 256 color chart. The image data is the color palette index value, that is, the actual RGB brightness value. In addition, because it is a 256-color palette, one byte in the image data represents one pixel. For a color 256 color image, the image processing may produce a color that does not belong to the 256 color. Therefore, the image processing generally uses a grayscale image. This can also focus more on algor

= Encoding. UTF8.GetBytes (txtIV );DES. Mode = CipherMode. CFB;DES. Padding = PaddingMode. None;ICryptoTransform tf = DES. CreateDecryptor (); String hexString = Value;Byte [] bytes = new byte [hexString. Length/2];For (int I = 0; I {Bytes [I] = byte. Parse (hexString. Substring (I * 2, 2 ),System. Globalization. NumberStyles. HexNumber );} Return UTF8Encoding. UTF8.GetString (tf. TransformFinalBlock (bytes, 0, 16 )); Php: /*** The Encrypt library provides two-way encryption of text and b

keygenerator object for the selected DES algorithmKeygenerator kg = keygenerator. getinstance ("des ");Kg. INIT (SR ); // Generate the keySecretkey key = kg. generatekey (); // Obtain the key dataByte rawkeydata [] = key. getencoded (); /* You can use the key to encrypt or decrypt it, or save itFor future use of files */Dosomething (rawkeydata ); Step 2: encrypt data. After obtaining the key, you can use it to encrypt data. In addition to the decrypted classloader, there is usually an independ

Java encryption and decryption aes des TripleDes, aestripledes Package xxx. common. util; import org. slf4j. logger; import org. slf4j. loggerFactory; import javax. crypto. badPaddingException; import javax. crypto. cipher; import javax. crypto. illegalBlockSizeException; import javax. crypto. noSuchPaddingException; import javax. crypto. spec. secretKeySpec; import java. io. unsupportedEncodingException; import java. security. invalidAlgorithmParamet

/*************************************** * ********************* Function: // DES_EN (byte [] src, byte [] key) Description: // DES encryption algorithm Input: // byte [] src encryption source, byte [] key encryption key Output: // encrypted src Return: // byte [] ********************************* * ***********************/public static byte [] DES_EN (byte [] src, byte [] key) {try {SecretKey secret ey = new SecretKeySpec (key, "DES"); // generate key 21 Ci