I understand that one can use for example PGP (or GnuPG) to encrypt emails and files. (And I understand that there are other programs out there that will do "similar things") This, though, requires that both the sender and recipient have PGP installed on the computer that they are using. And it requires, of course, sharing keys. From my understanding, this means that one can't use a public computer or for example a work computer to do encryption with PGP. Since we can't assume that all computers have PGP installed, this, in my mind, seems to make PGP undesirable to use on a large scale
I understand that
- There is pretty much no such thing as perfect secrecy in the real world
- One might not want to use public computers or work computers to send sensitive information even though there might also be an advantage in using a public computer in a library.
Since most computers are connected to the internet, my question is:
What is a "good" way to encrypt messages using just the internet that does not assume any installed program except a standard browser like Firefox, Chrome, etc?
So I am looking for a way to use for example Yahoo Mail or Gmail with online based encryption.
I am not necessarily interested in "very strong" encryption. I am just interested in encrypting emails and not necessarily files.