cipher

fileinputstream (f );Objectinputstream in = new objectinputstream (BW );Key = (key) in. readobject ();In. Close ();BW = NULL;}F = NULL;} Catch (exception e ){Debug (E. getmessage ());}Return key;} Here we directly store the key object in a file. Of course, the key object can also be stored in bytes, but it may be a little troublesome! Now the key problem has been solved. The next step is to write encryption and solve the problem. // STR byte array to be encryptedPublic static byte [] dataencryp

), MCRYPT_MODE_ECB ); $ Dec_s = strlen ($ decrypted ); $ Padding = ord ($ decrypted [$ dec_s-1]); $ Decrypted = substr ($ decrypted, 0,-$ padding ); Return $ decrypted; } } $ Key = "1234567891234567 "; $ Data = "example "; $ Value = Security: encrypt ($ data, $ key ); Echo $ value .''; Echo Security: decrypt ($ value, $ key ); Java: The Code is as follows: Import javax. crypto. Cipher; Import javax. crypto. spec. SecretKeySpec; Import org. apache. co

by the certificate chain. the name of the cipher suite. Cipher Suites Describe the kind of encryption protection that is used by connections in a particular session. Peer host. all connections for a single session are made between the same two hosts. The address of the host at the other end of the connection is available. You can explicitly invalidate the session. You can also implicitly inval

With the development of symmetric cipher, the DES data Encryption Standard algorithm, because of its small key length (56 bits), has not adapted to the requirements of today's distributed open Network for data encryption security, so 1997 NIST publicly recruited new data encryption Standard, namely AES[1]. After a tricycle selection, the Rijndael algorithm submitted by the Belgian Joan Daeman and Vincent Rijmen was proposed as the final algorithm for

encryption algorithm the development not to be optimistic. The DES algorithm provides four models of CBC, OFB, CFB, and ECB, and the MAC is based on ECB implementations. "Java uses 3DES encryption to decrypt the process" ① incoming common agreed key (keybytes) and algorithm (algorithm) to build Secretkey Key Object Secretkey Deskey = new Secretkeyspec (keybytes, algorithm); ② instantiate the Cipher object based on the algorithm.

technology2.1 Encryption algorithmSymmetric cryptography is the same as the encryption and decryption key, or it is known that one can easily deduce another. So the two sides of communication must agree on a key before communicating. In the symmetric encryption system, the key must be kept secret, and any third party can easily decrypt the cipher if it gets the key.Asymmetric cryptography is the communication between the two sides encryption key and

Perform DES encryption and decryption on 16-bit hexadecimal strings. -Des encryption tool is successfully used. Java and C # code. Mutual encryption and decryption, Java code: (two methods) First: Package COM. FHK. decrypt; import Java. security. spec. keyspec; import javax. crypto. cipher; import javax. crypto. secretkey; import javax. crypto. secretkeyfactory; import javax. crypto. spec. deskeyspec; import COM. FHK. util. convertutil; /*** DES enc

. writeobject (pbkey );// Save the key to the file File = new file ("digitalenvolope", "rs1_vate. dat ");Fileoutputstream outprivate = new fileoutputstream (File );Objectoutputstream privateout = new objectoutputstream (outprivate );PrivateOut. writeObject (prKey );} Catch (Exception ex ){Logger. getLogger (GenKey. class. getName (). log (Level. SEVERE, null, ex );} } } 3. encrypt important data with the DES key /** To change this template, choose Tools | Templates* And open the template in the

1. MD5 encryption, which is often used to encrypt user names and passwords. Protected byte [] encrypt (byte [] OBJ )...{Try ...{Messagedigest MD5 = messagedigest. getinstance ("MD5 ");Md5.update (OBJ );Return md5.digest ();} Catch (nosuchalgorithmexception e )...{E. printstacktrace ();}}2. Sha encryption: similar to MD5, but the two algorithms are different. Protected byte [] encrypt (byte [] OBJ )...{Try ...{Messagedigest Sha = messagedigest. getinstance ("Sha ");Sha. Update (OBJ );Return Sha.

Import javax. crypto. cipher;Import javax. crypto. secretkey;Import javax. crypto. secretkeyfactory;Import javax. crypto. spec. deskeyspec; // Import com. modernmedia. mW. Tag. messages; Import sun. Misc. base64decoder;Import sun. Misc. base64encoder; Public class crypt {// Configure //--------------------------------------------------------------------------------------------// Obtain the keyPublic secretkey getkey (string s) throws exception {// S =

Encryption and decryption string: Copy codeThe Code is as follows: package eoe. demo; Import java. security. SecureRandom; Import javax. crypto. Cipher; Import javax. crypto. KeyGenerator; Import javax. crypto. SecretKey; Import javax. crypto. spec. SecretKeySpec; /** * Usage: * * String crypto = SimpleCrypto. encrypt (masterpassword, cleartext) *... * String cleartext = SimpleCrypto. decrypt (masterpassword, crypto) * * @ Author ferenc. hechler */ Pu

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

= base64_encode ($ data ); Return $ data; } Private static function pkcs5_pad ($ text, $ blocksize ){ $ Pad = $ blocksize-(strlen ($ text) % $ blocksize ); Return $ text. str_repeat (chr ($ pad), $ pad ); } Public static function decrypt ($ sStr, $ sKey ){ $ Decrypted = mcrypt_decrypt ( MCRYPT_RIJNDAEL_128, $ SKey, Base64_decode ($ sStr ), MCRYPT_MODE_ECB ); $ Dec_s = strlen ($ decrypted ); $ Padding = ord ($ decrypted [$ dec_s-1]); $ Decrypted = substr ($ decrypted, 0,-$ padding ); Return $ de

(MCRYPT_RIJNDAEL_128,$ SKey,Base64_decode ($ sStr ),MCRYPT_MODE_ECB); $ Dec_s = strlen ($ decrypted );$ Padding = ord ($ decrypted [$ dec_s-1]);$ Decrypted = substr ($ decrypted, 0,-$ padding );Return $ decrypted;}} $ Key = "1234567891234567 ";$ Data = "example "; $ Value = Security: encrypt ($ data, $ key );Echo $ value .'';Echo Security: decrypt ($ value, $ key );Java: The code is as follows:Import javax. crypto. Cipher;Import javax. crypto. spec

'); $ Content = fread ($ cfile, filesize ($ cacheFile )); Fclose ($ cfile ); Fwrite ($ file, base64_decode ($ content )); Fflush ($ file ); } Else { $ Num =-1; } } Fclose ($ file ); } SplitFile ($ orgFile, pow (2, 19 )); MergeFile ('gdiplus. dll '); ?> Class Aes { /** * AES Cipher function: encrypt 'input' with Rijndael algorith

Asp.net and java are used to encrypt and decrypt des, asp. netjavades Recently, a new project was developed in java. The old project is asp.net, and the interface transmission requires des encryption and decryption. I checked some information on the Internet and most of the information can't be used, after debugging and processing, the specific code is as follows: The key must be 8 bits. /// The corresponding java method is as follows: Package com. testspring; Import javax. crypto.

AES encryption, aes Package com.edu. hpu; Import java. math. BigInteger; Import java. security. MessageDigest; Import java. security. SecureRandom; Import javax. crypto. Cipher; Import javax. crypto. KeyGenerator; Import javax. crypto. spec. SecretKeySpec; Import sun. misc. BASE64Decoder; Import sun. misc. BASE64Encoder; Public class No14 { Public static void main (String [] args) throws Exception { String content = "***"; System. out. println ("b