asymmetric encryption example

to tamper with the information after the "fingerprint" also modified, only with E own private key encryption, then B can use a's public key to decrypt the data do not? No!!!E only modifies the contents of the information, B decrypts the "fingerprint" with the public key of a, can the content and the "fingerprint" horse right? No!!!Although the confidentiality of information is not guaranteed, this completes the integrity of the information and authen

Overviewjava-Information Security (i)-base64,md5,sha,hmacjava-Information Security (II.)-Symmetric encryption algorithm DES,3DES,AES,BLOWFISH,RC2,RC4java-Information Security (iv)-data signing, digital certificatesjava-Information Security (v)-Asymmetric encryption algorithm RSAIf you want to understand the good HTTPS, please try to understand the above informati

encryption, private key decryption---encryptionX509encodedkeyspec =NewX509encodedkeyspec (rsapublickey.getencoded ()); Publickeyfactory= Keyfactory.getinstance ("RSA"); PublicKey=publickeyfactory.generatepublic (X509ENCODEDKEYSPEC); Publiccipher= Cipher.getinstance ("RSA"); Publiccipher.init (Cipher.encrypt_mode, PublicKey); Result=publiccipher.dofinal (Src.getbytes ()); System.out.println ("Public key

, public key, and private key.The private key can only be safely kept by one party and cannot be compromised, while the public key may be sent to any person requesting it. Asymmetric encryption uses one of these keys to encrypt, while decryption requires another key.For example, you ask the bank for the public key, the bank sends you the public key, you encrypt t

. memorystream = New Memorystream ();Cryptostream CS = New Cryptostream (MS, Des. createencryptor (Key, IV), cryptostreammode. Write );CS. Write (inputbytearray, 0 , Inputbytearray. Length );CS. flushfinalblock (); Return Convert. tobase64string (Ms. toarray ()); }Catch(Exception ex){ ReturnEx. message;}} PublicStaticStringDecrypt (StringStrtext){ Byte [] inputbytearray; Try{Inputbytearray=Convert. frombase64string (strtext ); descryptoserviceprovider des = New descryptoser

首先引入两个术语：明文和密文。明文是指未加密前的原始数据，密文是指加密后的数据。根据加密和解密时的密码不同，可以分为两种类型的加密解密算法。 一、对称加密/解密。 加密和解密使用相同的密码，有代表性的有DES、Blowfish、TEA、Base64。对称加密解密的特点是运算相对非对称加密解密简单、速度块，主要应用于需要加密大量数据的场合，例如游戏的资源文件加密。 对称加密，是一种比较传统的加密方式，其加密运算、解密运算使用的是同样的密钥，信息的发送者和信息的接收者在进行信息的传输与处理时，必须共同持有该密码（称为对称密码）。因此，通信双方都必须获得这把钥匙，并保持钥匙的秘密。单钥密码系统的安全性依赖于以下两个因素：第一、加密算法必须是足够强的，仅仅基于密文本身去解密信息在实践上是不可能的。第二、加密方法的安全性依赖于密钥的秘密性，而不是算法的秘密性，因此，我们没有必要确保算法的秘密性（事实上，现实中使用的很多单钥密码系统的算法都是公开的），但是我们一定要保证密钥的秘密性。DES(Data Encryptio