Security Code Samples

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Java technologies include APIs for signing and verifying signed data, encrypting and decrypting data, and writing a security manager. A security manager is a Java virtual machine (JVM¹) object that implements a security policy such as prompting an end user for password verification. However, for export reasons, code for encrypting and decrypting data cannot be shown on the Web.

• Java Cryptography Extension
• Java Web Start and Security
• Signing and Verifying Signed Data
• Writing a Security Manager

• EncryptTest demonstrates the JCE API by encrypting and decrypting a series of objects. For supporting information see Exploring the Security Changes of the J2SE Platform.
  
  
• JSSE demonstrates the JSSE library by reading a Web page through port 443, which is the HTTPS port. For supporting information see Exploring the Security Changes of the J2SE Platform.
  
  

• writeFile.java shows how to run an applet securely with Java Web Start. For supporting information see Java Web Start to the Rescue.
  
  
• writeFile.java is another version of an applet that uses Java Network Launch Protocol (JNLP) to write to a user-selected file. The applet is run securely with Java Web Start. For supporting information see Java Web Start to the Rescue.
  
  

• GenSig.java shows how to generate a digital signature on data.
  
  
• VerSig.java shows how to verify a digital signature on data.
  
  

• FileIO.java has a security manager that prompts the end user to enter a password before it allows a read or write operation.
  
  
• PasswordSecurityManager.java is the custom security manager for the FileIO.java program.