rsa algorithm in java

Implement simple RSA key generation and encryption/decryption (Java), rsajava Recently I have been studying PKI and have come into contact with some encryption algorithms. I focused on RSA and wrote a simple Demo to implement the RSA algorithm, including public and private k

= cipher.dofinal (plaintext);string S1 = new String (enbytes);System.out.println ("Ciphertext after encryption:" + S1);Get the key through the key stringPublicKey = Getpublickey (publickeystring);Privatekey = Getprivatekey (privatekeystring);DecryptCipher.init (Cipher.decrypt_mode, Privatekey);Byte[]debytes = Cipher.dofinal (enbytes);publickeystring = getkeystring (PublicKey);System.out.println ("public:\n" +publickeystring);privatekeystring = getkeystring (Privatekey);System.out.println ("priv

) {a[i++] = 0;}var al = a.length;var result = "";var j, k, block;For (i = 0; I block = new BigInt ();j = 0;For (k = i; K block.digits[j] = a[k++];block.digits[j] + = a[k++] }var crypt = Key.barrett.powMod (block, key.e);var Text = Key.radix = = 16? Bitohex (crypt): bitostring (crypt, key.radix);Result + = text + "";}return result.substring (0, result.length-1); Remove last Space.}function Decryptedstring (key, S){var blocks = S.split ("");var result = "";var i, j, block;For (i = 0; I var bi;if (

If I have studied in college, I forget to continue learning and then I forget to continue learning. Because you don't know this.AlgorithmWhat is the essence. This time I finally understood it. If you are looking for abuse, please visit the original matrix document. I think you are not a hacker. Read the blog of matrix. It makes you realize that it is an idiot in one minute. I feel that every word is known in five minutes, but every sentence cannot be understood.Matrix67's blog once searched for

First, the basic knowledgehttp://blog.csdn.net/pi9nc/article/details/9734437Second, the analog loginBecause last semester took part in a big data game, need to crawl data, so just want to write a crawler crawl Sina Weibo data.Of course crawling data is not aimless, I need to follow the key words to crawl related Weibo.Just like Weibo has an advanced search feature, but to get more tweets, you need to log in, so you'll need to simulate a login.The following code is modeled by the

Join JMeter Advanced Technology QQ Group: 572445436, participate in JMeter technical ExchangeThis article describes jmeter encryption parameters using the RSA algorithmIf the test process, some of the interface using RSA encryption algorithm, our JMeter can also be called directly, do not need to develop and remove the encryption code!Directly on the codeImportor

RSA algorithm is an asymmetric encryption algorithm, which is widely used in public key cryptography, and it is mainly used to encrypt information and digital signature. Wikipedia gives an introduction to the RSA algorithm as follows: Suppose Alice wants to receive a privat

a pair of keys using the RSA algorithm and stores it//in th EIR respective files GenerateKey (); } final String originaltext = "Text to is encrypted"; ObjectInputStream inputstream = null; Encrypt the string using the public key InputStream = new ObjectInputStream (new FileInputStream (Public_key_file)); Final PublicKey PublicKey = (publickey) inputstream.readobject (); Final

Out of boredom, intends to implement the RSA algorithm againThe first step, large prime number generationIn Java's BigInteger, there's a ready-made method.public static BigInteger probableprime (int bitlength, Random rnd) {Bitlength is the number of bits that is expected to be generated, and Rnd is the random number generatorThe function note indicates that the return value of this method is composite and t

Php has been practicing rsa algorithms for more than a month in the company. I am studying Php interns every day. but I am about to do my graduation thesis. I can't find any time. now I will share my questions: design and implementation of a secure Web service based on the public key cryptography system description: WEB servers are the core of enterprise network Intranet websites, and the data is very important, once damaged, php will implement the

;importjavax.crypto.BadPaddingException;import javax.crypto.cipher;importjavax.crypto.illegalblocksizeexception;import Javax.crypto.nosuchpaddingexception;publicclasstest{publicstaticvoidmain ( String[]args) {//test ();//test1 ();//test2 ();//test3 (); Test4 ();} PRIVATENBSP;STATICNBSP;VOIDNBSP;TEST4 () {try{//RSA key pair keypairgenerator Keypairgenerator=keypairgenerator.getinstance ("RSA"); Keypairgenera

I. RSA INTRODUCTION RSA public Key Cryptography system is proposed by R.rivest,a.shamir,l.adleman, not only can be used for data encryption, but also for digital signatures, the algorithm is as follows: 1, take two similar large prime numbers p, q; 2. Calculation of n=p*q,z= (p-1) * (q-1); 3. Any integer e with a z-element; 4. Calculates the integer d that s

First, the introduction: RSA encryption algorithm is the most commonly used asymmetric encryption algorithm, CFCA in the certificate service cannot leave it. RSA is the first more sophisticated public key algorithm that can be used for both encryption and digital signatures.

PHP Implementation of RSA algorithm

PHP Implementation of RSA algorithm Into the company internship one months, do PHP interns, every day in the study, but immediately to do graduation thesis, really can not draw time, now will be the subject of the sun: Design and implementation of secure Web service based on public key cryptography Describe: Web server is the core of intranet Web site, the data of which is very important, once destroyed wil

RSA algorithm C language implementation One, source files three rsa.h, RSA.C, MAIN.CRsa.h#include Two run Implementation of RSA algorithm C language

PHP Implementation of RSA algorithm Into the company internship one months, do PHP interns, every day in the study, but immediately to do graduation thesis, really can not draw time, now will be the subject of the sun: Design and implementation of secure Web service based on public key cryptography Describe: Web server is the core of intranet Web site, the data of which is very important, once destroyed wil

This article mainly introduces the use of OpenSSL to implement RSA asymmetric encryption algorithm example, we refer to the use of the bar nbsp; Code as follows: ; nbsp; nbsp; need to be aware that Apache supports OpenSSL nbsp;

; } /*** Digital signature production with private key, *@paramData *@paramPrivatekey *@return * @throwsException*/ Public Static byte[] Sign (byte[] Data,byte[] privatekey)throwsException {pkcs8encodedkeyspec PKC=NewPkcs8encodedkeyspec (Privatekey); Keyfactory keyfactory=keyfactory.getinstance (Key_algorithm); Privatekey Prikey=keyfactory.generateprivate (PKC); Signature Sig=signature.getinstance (Signature_algorithm); Sig.initsign (Prikey); Sig.update (data); returnsig

msg, 789 If the random private key is 23, obtained from (D * E) % 832 = 1, D = 1447 Key pair (901,23) (901,1447) Encryption process 2 Int text = 123 (note that the message must be smaller than N ); Because text ^ e % N = code, that is, 123 ^ 23% 901 = Code Get code = 149 ./rsa 123 23 901 pow=1169008215014432917465348578887506800769541157267remain=149 Decryption process 2 Int code = 149; Because code ^ d % N = text, that is, 149 ^ 1447% 901 = tex