Hi Vidya, Security dialog is to inform you about secure or non secure web pages. when you transition from a secure page to a non secure or vice versa, the dialog pops up to inform you the status.
You can also figure out if the page is secure or not by looking at the web address. if it has http: then it is not secure, but if it has https: then it is secure. In a secure page, the information that you enter on the page is sent to the web site after encrypting it. The web site receiving the encrypted information then decrypt the information. The algorithm (RSA algorithm named with initial letters of three of it's inventors) uses pair of keys, out of which one key is public and the other is private. The web site sends the public key to your browser , but no one other than the web site knows the private key (that's why it is private. Any one who knows the public key can encrypt the information, but without the private key no one can decrypt the information. private key how ever is not totally secure, given enough computing power, it can be deciphered. But the computing power available commonly is not enough to decrypt 128 bit or higher. it is shown by many researchers (using super computers) that up to 140 bits can be decrypted, (exact number may differ) as it's been some time for me when I had last updated my knowledge. the time it takes to decipher a key, grows exponentially, i.e. if it takes to decrypt a key an hour, it will take 2 hours to decrypt the same key with one more bit added to it. If you have read about the story where a king is happy and promises a guy to give what ever he wants, and the guy says give me 1 grain on the first cell of the chess, 2 on second and 4 on third, double the amount with each cell, and later they figure out that pretty soon they ran out of the whole grain supply of the state. that's how exponential growth works. The same technology is used by digital signature, but the process is reversed. anything that one wants to sign, is encrypted using the private key and your public key is used to decrypt the information. now the problem. how will someone verify that actually you signed the document? since your private key is not available to anyone. There comes a hierarchical system of maintaining private keys, where each entity stores the keys, and the final private key is with verisign, who maintains it somewhere in USA and the facility is guarded like nuclear facilities. When we get digital signature, we get our private key which we should preserve with utmost care, and the issuing agency saves our private key by encrypting it with their public key, and their own private key stays with their issuing agency. and they do not have access to their own private key, so they generate our public key before encrypting our private key, as they will not be able to decrypt our private key then onwards. So if you want to verify that some public key is actually the public key of the entity who claims so, you send that public key to the verification agency, who maintains the private key and the public key, they match your public key with the public key that they have, and tell you the status. Digital certificates maintain all the information required to identify an entity. But we don't have to do all the above ourselves, mostly the software that we use do all the activity behind the seen. Hope it clarifies. Regards Dinesh ----- Original Message ----- From: "Vidya Lakshmi" <[EMAIL PROTECTED]> To: <accessindia@accessindia.org.in> Sent: Friday, August 18, 2006 10:24 AM Subject: Re: [AI] Help - Security Dialog > > Hi Kiran ! > At present I am doing the same. But, I didn't understand why that dialog > box is appearing only when clicking on some links in some sites. > Another worry for me is - will this dialog create any issues to the > computer? > Thanks. > > > > Kiran Kaja <[EMAIL PROTECTED]> wrote: > Simple, click the "Yes" button. > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Vidya Lakshmi > Sent: Friday, August 18, 2006 9:07 AM > To: accessindia@accessindia.org.in > Subject: [AI] Help - Security Dialog > > > Hi ! > Can anybody help me to understand the below issue? > Sometimes in some sites if I try to open certain links, the security > dialog box appears. For example, you can visit dell.com. In this site if > you > click on link Battery Recall, you will get this dialog. > Why is this so? > What should one do at this time? > > Thanks in advance > > > > > Cheers > > Vidya > Computer Trainer > Enable India > Ph:9880708084 > > --------------------------------- > How low will we go? Check out Yahoo! Messenger's low PC-to-Phone call > rates. > > > To unsubscribe send a message to [EMAIL PROTECTED] > with the subject unsubscribe. > > To change your subscription to digest mode or make any other changes, > please visit the list home page at > http://accessindia.org.in/mailman/listinfo/accessindia_accessindia.org.in > > > > Cheers > > Vidya > Computer Trainer > Enable India > Ph:9880708084 > > --------------------------------- > Do you Yahoo!? > Everyone is raving about the all-new Yahoo! Mail Beta. -------------------------------------------------------------------------------- > To unsubscribe send a message to [EMAIL PROTECTED] > with the subject unsubscribe. > > To change your subscription to digest mode or make any other changes, > please visit the list home page at > http://accessindia.org.in/mailman/listinfo/accessindia_accessindia.org.in To unsubscribe send a message to [EMAIL PROTECTED] with the subject unsubscribe. 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