CECPQ1

In cryptography, CECPQ1 is a post-quantum cipher developed by Google to make web browsers secure via Transport Layer Security (TLS).[1]

Details

CECPQ1 was designed to provide confidentiality even against an attacker who possesses a large quantum computer. It is a key-agreement algorithm plugged into TLS that combines X25519 and New Hope, a ring learning with errors primitive. Even if New Hope turns out to be breakable, the X25519 key-agreement will ensure that it provides at least the security of our existing connections.[1]

It is available in Google Chrome 54 beta.[2] In 2016, the experimental use in Chrome ended and it was planned to disable CECPQ1 in a later Chrome update.[3]

In CECPQ1, 32 bytes of shared secret material are derived using X25519 key exchange, with a further 32 bytes being derived using the newhope lattice-based key exchange method (whence the quantum-resistance). The resulting bytes are concatenated and form a pre-master secret for deriving shared keys.

See also

References

  1. 1 2 "Chrome: Stop future computers from cracking current encryption". CNET.
  2. ↑ "Chrome 54 Beta Brings Custom Elements V1: Create Custom HTML Tags - Phoronix". Phoronix.
  3. ↑ "CECPQ1 results (28 Nov 2016)". Adam Langley, security officer at Google.


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