Is Barclays quantum-safe?
Partly. 112 of 141 public servers under barclays.co.uk use post-quantum key exchange, the protection against traffic recorded today being decrypted once a large quantum computer exists. Grade B. Scanned October 18, 2026.
Fix first
Production login, API, VPN, payment and developer servers that still rely on key exchange scheduled for retirement.
- secure.personalisedcard.barclays.co.uk
28 other servers without post-quantum key exchange
- click.email.barclays.co.uk
- click.emails.barclays.co.uk
- cloud.email.barclays.co.uk
- cloud.emails.barclays.co.uk
- fnp.barclays.co.uk
- investments.barclays.co.uk
- metrics.barclays.co.uk
- pbwmappointmentbooking.barclays.co.uk
- pbwmcommunications.barclays.co.uk
- personalisedcard.barclays.co.uk
- replay.barclays.co.uk
- research-centre.barclays.co.uk
- resources.barclays.co.uk
- smartinvestor-gem.barclays.co.uk
- smartinvestor-pi.barclays.co.uk
- smartinvestor-uat-gem.barclays.co.uk
- smartinvestor-uat-pi.barclays.co.uk
- smartinvestor-uat.barclays.co.uk
- smartinvestor.barclays.co.uk
- th.barclays.co.uk
- tm.barclays.co.uk
- view.email.barclays.co.uk
- view.emails.barclays.co.uk
- www.extractor.barclays.co.uk
- www.media.barclays.co.uk
- www.onlineabs.barclays.co.uk
- www.resources.barclays.co.uk
- www.smartinvestor.barclays.co.uk
112 servers already protected
- ask.barclays.co.uk
- bank.barclays.co.uk
- barclays-insurance.barclays.co.uk
- barclays.co.uk
- branch.barclays.co.uk
- checkout.barclays.co.uk
- cloudit.bank.barclays.co.uk
- clouditdh.bank.barclays.co.uk
- clouditdh2.bank.barclays.co.uk
- demo.barclays.co.uk
- email-int.barclays.co.uk
- experiences.barclays.co.uk
- featuresstore.barclays.co.uk
- forms-bus.barclays.co.uk
- forms-int.barclays.co.uk
- forms-mtg.barclays.co.uk
- forms-opb.barclays.co.uk
- forms-vob.barclays.co.uk
- forms-wth.barclays.co.uk
- forms.barclays.co.uk
- formsdss-lcp.barclays.co.uk
- formsdss-live.barclays.co.uk
- help.barclays.co.uk
- image.email.barclays.co.uk
- image.emails.barclays.co.uk
- jobs.barclays.co.uk
- lct-bus1-prd-glf.barclays.co.uk
- lct-int1-prd-glf.barclays.co.uk
- lct-mtg1-prd-glf.barclays.co.uk
- lct-opb1-prd-glf.barclays.co.uk
- lct-vob1-prd-glf.barclays.co.uk
- lct-wth1-prd-glf.barclays.co.uk
- lct.barclays.co.uk
- m.barclays.co.uk
- mca.barclays.co.uk
- mobile.barclays.co.uk
- online.personal.barclays.co.uk
- openbanking.barclays.co.uk
- pilot.barclays.co.uk
- pilot13.barclays.co.uk
- pilot14.barclays.co.uk
- pilot15.barclays.co.uk
- pilot16.barclays.co.uk
- pilot23.barclays.co.uk
- pilot24.barclays.co.uk
- pilot25.barclays.co.uk
- pilot26.barclays.co.uk
- pilot6.barclays.co.uk
- pres.investorrelations.barclays.co.uk
- r0-bus1-prd-glf.barclays.co.uk
- r0-int1-prd-glf.barclays.co.uk
- r0-mtg1-prd-glf.barclays.co.uk
- r0-opb1-prd-glf.barclays.co.uk
- r0-vob1-prd-glf.barclays.co.uk
- r0-wth1-prd-glf.barclays.co.uk
- r1-bus1-prd-glf.barclays.co.uk
- r1-int1-prd-glf.barclays.co.uk
- r1-mtg1-prd-glf.barclays.co.uk
- r1-opb1-prd-glf.barclays.co.uk
- r1-vob1-prd-glf.barclays.co.uk
- r1-wth1-prd-glf.barclays.co.uk
- r2-bus1-prd-glf.barclays.co.uk
- r2-int1-prd-glf.barclays.co.uk
- r2-mtg1-prd-glf.barclays.co.uk
- r2-opb1-prd-glf.barclays.co.uk
- r2-vob1-prd-glf.barclays.co.uk
- r2-wth1-prd-glf.barclays.co.uk
- r3-bus1-prd-glf.barclays.co.uk
- r3-int1-prd-glf.barclays.co.uk
- r3-mtg1-prd-glf.barclays.co.uk
- r3-opb1-prd-glf.barclays.co.uk
- r3-vob1-prd-glf.barclays.co.uk
- r3-wth1-prd-glf.barclays.co.uk
- rolbdss-lcp.barclays.co.uk
- rolbdss-live.barclays.co.uk
- search-int-solr74.barclays.co.uk
- search-int.barclays.co.uk
- search-solr74.barclays.co.uk
- search.barclays.co.uk
- sme-lending.barclays.co.uk
- smetrics.barclays.co.uk
- webcasts.barclays.co.uk
- welcome.bank.barclays.co.uk
- www.apply.barclays.co.uk
- www.applyloan.barclays.co.uk
- www.bank.barclays.co.uk
- www.barclays.co.uk
- www.careers.barclays.co.uk
- www.choose.barclays.co.uk
- www.forms.barclays.co.uk
- www.graduates.barclays.co.uk
- www.help.barclays.co.uk
- www.insurance-services.barclays.co.uk
- www.insurance.barclays.co.uk
- www.investingforincome.barclays.co.uk
- www.investments.barclays.co.uk
- www.jobs.barclays.co.uk
- www.ledgermaster.barclays.co.uk
- www.life.barclays.co.uk
- www.loans.barclays.co.uk
- www.mortgages.barclays.co.uk
- www.online.personal.barclays.co.uk
- www.openplan.barclays.co.uk
- www.personal.barclays.co.uk
- www.personalbanking.barclays.co.uk
- www.premier.barclays.co.uk
- www.protect.barclays.co.uk
- www.secure.barclays.co.uk
- www.students.barclays.co.uk
- www.travel.barclays.co.uk
- www.youth.barclays.co.uk
- youniquely.barclays.co.uk
What this means
NIST has scheduled the key exchange most servers still use for retirement: deprecated after 2030, disallowed after 2035 (NIST IR 8547). Traffic recorded today can be decrypted once a large quantum computer exists. A server that offers hybrid ML-KEM key exchange closes that today; a server that does not is still open to harvest now, decrypt later.
Hostnames come from public certificate logs plus common service names, kept where the name resolves to a public address, and each is tested from the outside with post-quantum-only TLS 1.3 handshakes. A hostname shows what a server is called, not what traffic it carries; internal systems are out of scope. Method.
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<a href="https://latticescan.com/readiness/barclays.co.uk"><img src="https://latticescan.com/badge/readiness/barclays.co.uk" alt="quantum readiness"></a>