Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: mpENC Multi-Party Encrypted Messaging Protocol design document   This document is a technical overview and discussion of our work, a protocol
for secure group messaging. By secure we mean for the actual users i.e.
end-to-end security, as opposed to "secure" for irrelevant third parties.
  Our work provides everything needed to run a messaging session between real
users on top of a real transport protocol. That is, we specify not just a key
exchange, but when and how to run these relative to transport-layer events; how
to achieve liveness properties such as reliability and consistency, that are
time-sensitive and lie outside of the send-receive logic that cryptography-only
protocols often restrict themselves to; and offer suggestions for displaying
accurate (i.e. secure) but not overwhelming information in user interfaces.
  We aim towards a general-purpose unified protocol. In other words, we'd
prefer to avoid creating a completely new protocol merely to support
automation, or asynchronity, or a different transport protocol. This would add
complexity to the overall ecosystem of communications protocols. It is simply
unnecessary if the original protocol is designed well, as we have tried to do.
  That aim is not complete -- our full protocol system, as currently
implemented, is suitable only for use with certain instant messaging protocols.
However, we have tried to separate out conceptually-independent concerns, and
solve these individually using minimal assumptions even if other components
make extra assumptions. This means that many components of our full system can
be reused in future protocol extensions, and we know exactly which components
must be replaced in order to lift the existing constraints on our full system.

20
The categories of this paper are: acc-phys
16
The categories of this paper are: stat
13
The categories of this paper are: quant-ph
28
The categories of this paper are: alg-geom
25
The categories of this paper are: patt-sol
10
The categories of this paper are: q-bio
0
The categories of this paper are: hep-ph
12
The categories of this paper are: nucl-th
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The categories of this paper are: hep-ex
3
The categories of this paper are: physics
9
The categories of this paper are: nlin
5
The categories of this paper are: gr-qc
30
The categories of this paper are: q-alg
14
The categories of this paper are: math-ph
36
The categories of this paper are: cmp-lg
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The categories of this paper are: solv-int