caesar cipher java code

If the same plaintext letter in a different position in the clear text is the same as the corresponding ciphertext in the ciphertext, it is called a single-table cryptosystem.Representative single-table password:1. Shift or add password2. Multiplier or multiplication password3. Affine password4. Key phrase passwordHere is an example:1. Addition Cipher algorithm:P=c=k=zm (zm∈{0,1,..., m-1})Ek (x) =x+k (mod m) =y∈cDk (y) =y-k (mod m) =x∈pWhen k=3, the

First, the principle:CTR Mode is a stream cipher that generates a key stream by encrypting successive accumulated counters, and in CTR mode, each packet corresponds to a successive cumulative counter, and the key stream is generated by encrypting the counter. The final cipher packet is obtained by XOR the bit sequence encrypted by the counter and the plaintext packet.Second, schematic diagram:Three, the adv

Problem Description:Des encryption is used recently and is consistent with the results of Java's cipher class encryption. The cliper of Java has not been studied, but in work cipher generates a string based on the Des/cbc/pkcs5padding encryption method.In comparison, this string is formatted directly with the NSData generated by OC encryption ([NSString stringwit

BASE64 encryption algorithm, widely used, especially in e-mail transmission, has a great useThe program code written in Java is as followsImportjava.awt.BorderLayout;ImportJava.awt.EventQueue;Importjava.awt.event.ActionEvent;ImportJava.awt.event.ActionListener;Importjava.io.IOException;ImportJavax.swing.JFrame;ImportJavax.swing.JPanel;ImportJavax.swing.border.EmptyBorder;ImportJavax.swing.JTextArea;ImportJa

ease, and I will not worry that Clark will tamper with my IOU because:1. Clark was unable to make changes because I sent Clark a cipher. Clark could have modified the decrypted IOU, but Clark did not have my private key to imitate my encryption of the IOU. This is called tamper-proof.2. With my private key to encrypt the IOU, and only my public key can be decrypted. In turn, the IOU, which can be decrypted with my public key, must be encrypted with m

Use encryption technology to protect Java source code Content: 1. Why encryption? Ii. Custom Class Loader Iii. encryption and decryption 4. Application Instances 5. Notes Reference resources The source code of the Java program is easily peeked at by others. Anyone can analyze others'

{Code ...} Import sun. misc. BASE64Decoder; import sun. misc. BASE64Encoder; import javax. crypto. cipher; import javax. crypto. secretKey; import javax. crypto. secretKeyFactory; import javax. crypto. spec. DESKeySpec; import java. io. IOException; import java. security. secureRandom; public class PHPDESEncrypt {Strin

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

(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. spe

= string2ByteArr(hexStr); return decode(arr, password); } private static String decode(byte[] arr, String password) { try{ Cipher cipher = Cipher.getInstance(AES); cipher.init(Cipher.DECRYPT_MODE, getKey(password)); byte[] result = cipher.doFinal(arr); return new String(result, CHARSET_NAME); }catch (Exception e){

Reprint Address: Java version AES encryption algorithm The Advanced Encryption Standard in cryptography (Advanced encryption Standard,aes), also known as Rijndael encryption, is a block encryption standard used by the U.S. federal government. This standard, which replaces the original DES, has been analyzed and widely used worldwide. After five years of selection process, the Advanced Encryption Standard was issued by the National Institute of Standar

This article mainly introduces the des encryption and decryption code sharing that is compatible with PHP and Java. it is suitable for cases where the server is written in JAVA and the client is written in PHP and des encryption and decryption is required, for more information about php code, see:

This article mainly introduces the des encryption and decryption code sharing that is compatible with PHP and Java. it is suitable for cases where the server is written in JAVA and the client is written in PHP and des encryption and decryption is required, for more information about php code, see:

Php code: Java code: Package com. test; import it. sauronsoftware. base64.Base64; import java. security. key; import java. security. secureRandom; import java. security. spec. algorithmParameterSpec; import javax. crypto.