The IETF has taken the next small step down the long, long road of protecting user traffic from spooks, snoops and attackers, setting down the basic architectural principle that new protocols should resist monitoring.
It's not going to be a trivial undertaking: practically every layer of the Internet protocol stack has its origins in a more innocent era.
The new document, RFC 7258 (here), formalises the decision reached at the Vancouver IETF plenary in November [video] that pervasive monitoring is an attack on Internet users (and, in fact, “Pervasive Monitoring is an Attack” is the title of the RFC).
Unlike the blithe statements from law enforcement around the world that metadata collection is innocuous, the RFC explicitly includes metadata collection in its list of threats to Internet users, along with the collection of protocol artefacts, application content, active and passive wiretaps, traffic analysis and cryptographic subversion.
The aim of the new RFC, it says, is to record “the IETF community's consensus” and establish “the technical nature of PM.”
However, the RFC also makes the admission that we're never going to beat the spooks and snoops, because traffic necessarily traverses public networks and reveals where it's from and where it's going. “In all cases, there will remain some privacy-relevant information that is inevitably disclosed by protocols.”
Instead, the document states, protocol design in the future should “significantly increase the cost of attacking, force what was covert to be overt, or make the attack more likely to be detected”.
The RFC puts the onus on protocol developers to think about whether they're creating a new risk (or replicating an old one) early in the process: “adequate, early review of architectural decisions including whether appropriate mitigation of PM can be made is important”, because fixing mistakes late in the process is expensive.
The authors also note that the practice of reusing existing technology, while normal developer behaviour, can “significantly impact” how easy it is to monitor traffic in a new protocol. ®
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