 |
 | Home | Contact Us | FAQ | Search & Site Map | Link to Us |
 | Sign In | Join | Other 45 Sites in Network |
Java Forum / General / May 2006easiest way to encode a file?
Im trying to encode the data that I save in my applications saved files, basically I just want to find something simpley implemented and dependable on the conversions. is there anything in the Java api that Im missing that may be able to help me with this? Or will I need to develop something customized? > Im trying to encode the data that I save in my applications saved > files, basically I just want to find something simpley implemented and > dependable on the conversions. > > is there anything in the Java api that Im missing that may be able to > help me with this? Or will I need to develop something customized? I think we're using different terminology. I'm guessing you have some data in the form of objects floating around in memory, and you'd like to save this data to files. Simplest way to do that is to use Java serialization (see http://java.sun.com/docs/books/tutorial/essential/io/serialization.html). One step above that is to use an XML persistence library (http://www.castor.org/); the next step is persisting to DB (http://www.hibernate.org/), and then after that you'd be looking at designing your own custom file format. - Oliver Or he might mean cryptographically encode data? >Im trying to encode the data that I save in my applications saved >files, basically I just want to find something simpley implemented and >dependable on the conversions. Do you mean? 1. encode in a national character set, see http://mindprod.com/jgloss/encoding.html 2. encrypt so snoops can't see what you sent. see http://mindprod.com/jgloss/jce.htm 3. armour so that binary data can be sent as printable text. See http://mindprod.com/jgloss/armouring.html  SignatureCanadian Mind Products, Roedy Green. http://mindprod.com Java custom programming, consulting and coaching. > 2. encrypt so snoops can't see what you sent. see > http://mindprod.com/jgloss/jce.htm http://mindprod.com/jgloss/jce.html Andrey Signaturehttp://uio.imagero.com Unified I/O for Java http://reader.imagero.com Java image reader http://jgui.imagero.com Java GUI components and utilities um... I mean I have already saved a file (as plain text). However I would like to dissallow the user the ability to open the file as text and read every single one of my saved items. So I think that this means that I have a regular text file that I want to hide any readable data from a person that would open it in notepad and try to read it. um... I mean I have already saved a file (as plain text). However I would like to dissallow the user the ability to open the file as text and read every single one of my saved items. So I think that this means that I have a regular text file that I want to hide any readable data from a person that would open it in notepad and try to read it. > um... I mean I have already saved a file (as plain text). However I > would like to dissallow the user the ability to open the file as text [quoted text clipped - 3 lines] > to hide any readable data from a person that would open it in notepad > and try to read it. You want cryptography then. That's the http://mindprod.com/jgloss/jce.html link. - Oliver > You want cryptography then. That's the >http://mindprod.com/jgloss/jce.html link. other related links of interest: http://mindprod.com/jgloss/encryption.html http://mindprod.com/jgloss/ssl.html http://mindprod.com/jgloss/certificate.html http://mindprod.com/jgloss/digitalsignatures.html SignatureCanadian Mind Products, Roedy Green. http://mindprod.com Java custom programming, consulting and coaching. > um... I mean I have already saved a file (as plain text). However I > would like to dissallow the user the ability to open the file as text [quoted text clipped - 3 lines] > to hide any readable data from a person that would open it in notepad > and try to read it. one interesting question is - how do you want to hide this person to delete or change this data? Andrey Signaturehttp://uio.imagero.com Unified I/O for Java http://reader.imagero.com Java image reader http://jgui.imagero.com Java GUI components and utilities that is an interesting question, wish I knew what you were asking... perhaps you are missing a couple of words? > that is an interesting question, wish I knew what you were asking... > perhaps you are missing a couple of words? OK, from start: > I have a regular text file that I want > to hide any readable data from a person that would open it in notepad > and try to read it. I assume that this data could be important. So you don't want to lose it. So, since you can't hide user from opening data in notepad, he can change or delete this data. Andrey Signaturehttp://uio.imagero.com Unified I/O for Java http://reader.imagero.com Java image reader http://jgui.imagero.com Java GUI components and utilities >> that is an interesting question, wish I knew what you were asking... >> perhaps you are missing a couple of words? [quoted text clipped - 7 lines] > So, since you can't hide user from opening data in notepad, > he can change or delete this data. By "hide", you probably mean "prevent": You can't prevent the user from opening the data file in notepad. Depending on the OS being used, it may be possible to modify the access rights so that only the application (and perhaps the system administrator) can access the file. But then again, if you could implement this access at the OS level, there wouldn't be much use in encrypting the file in the first place. - Oliver >>> that is an interesting question, wish I knew what you were asking... >>> perhaps you are missing a couple of words? [quoted text clipped - 16 lines] > the OS level, there wouldn't be much use in encrypting the file in the > first place. It seemed pretty clear cut to me. He doesn't want the file readable but realizes that someone could reverse engineer his code to find out how to get the solution. I'd say use an encoding - but since the cryptographic functionality is already built into Java, just assign and store a key and then use it with an encryption algorithm like AES. (AES is fast.) Since the key will be available, using a more secure algorithm won't really matter, but AES is good all around. -- LTP :) I used cryptology, its not secure for some user that really wants to break it, but for my purposes I think it will do! Thanks, I plan on using the handshake idea before "billing" the user. > By "hide", you probably mean "prevent. yup Andrey Signaturehttp://uio.imagero.com Unified I/O for Java http://reader.imagero.com Java image reader http://jgui.imagero.com Java GUI components and utilities Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
|
Reply to this Message
|
 Sign In
 Join
 My Latest Posts My Monitored Threads My Blog My Photo Gallery My Profile My Homepage Start New Thread Enable EMail Alerts Rate this Thread
|
©2009 Advenet LLC Privacy Policy - Terms of Use
This website includes both content owned or controlled by Advenet as well as content owned or controlled by third parties.