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Not likely. To do so would require uploading your private key to the various services assuming that they have built the necessary web pages to prompt you for your encryption passphrase, etc. This would make your private key accessible to anyone on the service (an administrator) and would nullify any security benefit.
Indeed, the only way you can ensure security using public-key cryptography is to ensure your exclusive access to the private key itself. There is probably a way to use public-key cryptography using webmail but would be really cumbersome to use.
Barring the use of digital signatures, it is conceivable to design a webmail system whereby you could send encrypted emails if the public keys of the recipients could be loaded onto the webmail servers. But does that really solve the problem? Without the private key to digitally sign the email, anyone could forge an email as if from you.
On Mar 29, 2005, at 8:45 PM, Joey Harrison wrote:
is there any way to use gnupg with online email services like gmail, yahoo, and hotmail?
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