Computer Networking › Section H · Security in computer networks › Topic H.5
Securing e-mail
E-mail is the first place this section puts its cryptographic tools to work in a real application. Because a message is written now and read later, its protection has to travel inside the message itself, and that shapes every design choice.
In this topic
- Security for a message, not a connection
- Confidentiality: a session key in an envelope
- Worked example: wrapping a toy session key
- Authentication and integrity: a signed digest
- Doing both at once
- Worked example: what Bob does on arrival
- PGP and the web of trust
- S/MIME and the limits of end-to-end mail
- Protecting each hop with TLS
- Checking the sending domain
- Common mistakes to avoid
- Key takeaways
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