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Oracle defines the DES encryption and decryption and MD5 encryption function example, des encryption and decryption (1) DES encryption function create or replace functionencrypt_des(p_text varchar2, p_key varchar2) return varchar2 isv_text varchar2(4

MD5 's full name is Message-digest algorithm 5, developed by the MIT Computer Science Lab and RSA Data Security Inc in the early 90, with the development of MD2, MD3 and MD4.MD5 transforms any length of "byte string" into a large integer of 128bit,

1. What is MD5? MD5 is short for message-Digest algorithm 5 (Message Digest algorithm Fifth Edition, it is one of the hash algorithms (also translated hash algorithms and digest algorithms) Widely used in the current computer field to ensure the

Keyword-based webpage replication algorithm I think the algorithms mentioned above are based on this document. For large search engines, there are some performance gaps, so some optimizations are aimed at the keywords of web pages, or the meta

(1) DES encryption function Create or Replace function encrypt_des (p_text varchar2, P_key varchar2) return varchar2 is v_text varchar2 (4000) ; V_ENC varchar2 (4000); Raw_input RAW (128); Key_input RAW (128); Decrypted_raw Raw (2048); Begin

1. MD5 encryption, often used to encrypt user name passwords, when the user is authenticated. protected byte[] encrypt(byte[] obj) ...{ 　　try ...{ 　　　　MessageDigest md5 = MessageDigest.getInstance("MD5"); 　　　　　　md5.update(obj); 　　　　return

1. MD5 encryption, often used to encrypt user name passwords, when the user is authenticated. There is no way to decrypt it.protected byte [] Encrypt (byte [] obj) ... {Try ... {MessageDigest MD5 = messagedigest.getinstance ("MD5");Md5.update

http://blog.csdn.net/xdweleven/article/details/38319351(1) des cryptographic functionsCreate or Replace functionEncrypt_des (P_text varchar2, P_key varchar2) return varchar2 isV_text varchar2 (4000);V_ENC varchar2 (4000);Raw_input RAW

(1) des cryptographic functions Create or replace functionencrypt_des (P_text varchar2, P_key varchar2) return varchar2 isv_text varchar2 (4000); V_enc Varc HAR2 (4000); Raw_input Raw (Key_input raw);d Ecrypted_raw Raw (2048) Beginv_text: = Rpad (P_

When storing files, in order to save storage space, you need to implement file de-weight, that is, the same file only on the server to store one copy. One implementation is to upload the file to the application server, calculate the MD5 and store it