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digital signature

 
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9. Which of the following security features are provided by digital signatures?
A. Confidentiality
B. Non-repudiation
C. Verifiability
D. Sealing
can anyone please explain why A is not right, and what does D bean? does that mean Message digest?
Lucy
 
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Hi Lucy,
Please have a look at http://developer.java.sun.com/developer/technicalArticles/Interviews/DigitalSigs/
In a few words using a digital signature does not mean that your document is encrypted, it's just a guarantee that your document has not been altered.
-Chris
 
lucy hu
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Confidentiality
Confidentiality is the process of protecting data from unauthorized use or users. Simply put, it means that only the intended recipient of a message can make sense of it. http://www.javaworld.com/javaworld/jw-04-2000/jw-0428-security_p.html
 
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Chris is right on this one I think
 
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hi
i am looking for some good material in EJB security and design patterns
can you pls suggest where i can ...
 
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I believe sealing means the content has not been altered and nothing has been added to it. The idea comes from sealing an envelope and posting it.
 
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For security, "Beginning Java Networking" from WROX (Chad Darby, et al) will give you everything you need and then some. On design patterns, there's no better than to take a deep breath, and plunge into the classic "Design Patterns" from the GoF (skip the first part, tho.) Here's another...The Design Patterns Java Companion
Regards,
Doug (SCEA part one, complete)
 
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I agree with you advice of reading Design Patterns. But I disagree on your advice on skipping the first part. The first chapter is one of the best pieces ever written on OOP. Definitely a must read.
 
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