http://java.sun.com/security/signExample12/
http://java.sun.com/security/signExample12/doit
http://java.sun.com/security/signExample/
http://java.sun.com/security/signExample/doit
http://java.sun.com/sfaq/
http://developer.java.sun.com/developer/technicalArticles/Security/Signed/index.html
http://developer.java.sun.com/developer/onlineTraining/Programming/JDCBook/signed.html
http://java.sun.com/security/usingJavakey.html

http://java.sun.com/security/
http://java.sun.com/security/policy.html
http://java.sun.com/docs/books/tutorial/security1.2/index.html
http://java.sun.com/docs/books/tutorial/jar/sign/signing.html
http://developer.java.sun.com/developer/Books/JAR/sign/signing.html

http://java.sun.com/products//jdk/1.1/docs/tooldocs/win32/javakey.html
http://java.sun.com/products/jdk/1.2/docs/tooldocs/solaris/jarsigner.html
http://java.sun.com/products/jdk/1.2/docs/tooldocs/win32/jarsigner.html
http://java.sun.com/j2se/1.3/docs/tooldocs/win32/jarsigner.html
http://java.sun.com/products/jdk/1.2/docs/tooldocs/solaris/keytool.html
http://java.sun.com/products/jdk/1.2/docs/tooldocs/win32/keytool.html

Please note: the keytool and jarsigner tools completely replace the javakey
tool provided in JDK 1.1. These new tools provide more features than javakey,
including the ability to protect the keystore and private keys with passwords,
and the ability to verify signatures in addition to generating them.