Their use of Java made the Client-Server chat program, a combination of network communications, data security, knowledge of multi-threaded one. RSA algorithm using the completion of the distribution of DES keys 2. RSA algorithm combines the use of MD5 message to complete the signature 3. The original message and signature to provide confidentiality protection (with DES encryption algorithm) 4. Able to decrypt and verify the legitimacy of the signature

cs安全通信1.30
..............\client
..............\......\ClientUI.java
..............\......\Sign_n_Check.java
..............\......\SKey_DES.java
..............\......\SKey_RSA.java
..............\server
..............\......\ServerUI.java
..............\......\Sign_n_Check.java
..............\......\SKey_DES.java
..............\......\SKey_RSA.java

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