Google’s CECPQ1 experiment in 2016 integrated a post-quantum key-exchange
algorithm, newhope1024, into TLS 1.2. The Google-Cloudflare CECPQ2 experiment
in 2019 integrated a more efficient key-exchange algorithm, ntruhrss701, into
TLS 1.3.

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This paper revisits the choices made in CECPQ2, and shows how to achieve
higher performance for post-quantum key exchange in TLS 1.3 using a
higher-security algorithm, sntrup761. Previous work had indicated that
ntruhrss701 key generation was much faster than sntrup761 key generation, but
this paper makes sntrup761 key generation much faster by generating a batch of
keys at once.

Batch key generation is invisible at the TLS protocol layer, but raises
software-engineering questions regarding the difficulty of integrating batch
key exchange into existing TLS libraries and applications. This paper shows
that careful choices of software layers make it easy to integrate fast
post-quantum software, including batch key exchange, into TLS with minor
changes to TLS libraries and no changes to applications.

As a demonstration of feasibility, this paper reports successful integration
of its fast sntrup761 library, via a lightly patched OpenSSL, into an
unmodified web browser and an unmodified TLS terminator. This paper also
reports TLS 1.3 handshake benchmarks, achieving more TLS 1.3 handshakes per
second than any software included in OpenSSL.

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