For tampering, PGP-signed email is helpful.
For protecting secret communication contents, PGP-encrypted email can be helpful to some degree.
For preventing a surveillance from knowing who you talk to, when, from where and what type of content you likely exchange, email cannot become secure.
I suspect it is the combination of the three the author has in mind.
For tampering, PGP-signed email is helpful.
For protecting secret communication contents, PGP-encrypted email can be helpful to some degree.
For preventing a surveillance from knowing who you talk to, when, from where and what type of content you likely exchange, email cannot become secure.
I suspect it is the combination of the three the author has in mind.