TESTING · MONITORING · INCIDENT RESPONSE

Find out how someone would break into your business - before they try.

We test your systems the way an attacker would, then fix what we find. Reports you can act on, written in plain language.

RECON
$ scan --scope acme.corp→ 34 hosts, 12 public→ tcp/3389 exposed! admin panel, no MFA$
CRITICALhost-14
Unauthenticated remote access. Anyone on the internet could log in.
REPORT
7ways in, ranked
CLIENTS & PARTNERS WE WORK WITH
BCP Council
Bournemouth University
Multix Holding
Cyber Innovations
Talk To Breezie
OWASP
BCP Council
Bournemouth University
Multix Holding
Cyber Innovations
Talk To Breezie
OWASP

What we do.

Six ways we find and close the gaps in your security. Most clients start with the first one.

06 SERVICES
01 — PENETRATION TESTING

See where you would be broken into

We attack your websites, apps and systems the way a real intruder would, with your permission. Then we show you every way in we found, ranked by how much damage it could do.

1 WEAKNESS FOUND
02 — EXPOSURE MAPPING

Find what of yours is already exposed

Old servers, forgotten logins, staff details, files left public. We search the internet for everything connected to your company and tell you what to take down.

MAIL
API
VPN
DNS
S3
SCANNING EXPOSED ASSETS
03 — STAFF TRAINING

Train your team to spot the scam

Most breaches start with one person clicking one email. We send realistic test phishing to your staff, then teach the people who fall for it what to look for next time.

PHISH
RECOGNISED & NEUTRALISED
04 — NETWORK DESIGN

Build a network that holds

Setting up a new office, system or cloud environment? We design and build it secure from day one, so you are not paying to fix it later.

DATA
CORE
EDGE
BUILT LAYER BY LAYER
05 — UPGRADES & TUNING

Make what you already have faster and safer

We go through your current systems, patch what is out of date, remove what is not needed, and get more speed out of the hardware you already own.

THROUGHPUT TUNED
06 — AUDITS & COMPLIANCE

Pass your audit without the scramble

ISO 27001, GDPR, Cyber Essentials, client security questionnaires. We check your policies against what is actually required and write what is missing.

COMPLIANT
Decimus Security Operations

Someone is watching,
so you do not have to.

Our operations centre runs around the clock. We watch your systems for the early signs of an attack, act on them, and then tell you what happened and what we did about it - without the jargon.

Plain EnglishEvery report, no jargon
Fixed priceAgreed before we start
24/7Monitoring and incident response
FIELD RECORD

Competitions & Conferences.

Our team competes in national and international security competitions and speaks at industry conferences. Hover a card for detail, click through to the source.

UK National Cyber Security ChallengeNATIONAL FINALISTSBUUK Cyber Cup · 2025UK National Cyber Security ChallengeUK Cyber Cup · 2025UK National Cyber Security ChallengeTeam BU had the opportunity to respond to a simulated national cyber incident targeting critical UK port infrastructure. Presented in front of NCA, Interpol, MI6, BAE Systems & UK Government.Click For More Information. ↗Aviation Cyber Security Challenge EuropeTOP 3ZHAviation ISAC · 2025Aviation Cyber Security Challenge EuropeAviation ISAC · 2025Aviation Cyber Security Challenge EuropeRepresented the UK and finished in the top 3 in Europe against global cyber teams.Click For More Information. ↗UKFinnovator ChallengeWINNERSFIUKFin+ · 2026UKFinnovator ChallengeUKFin+ · 2026UKFinnovator ChallengeBuild and defend a fintech application in a 48-hour competition. Winners of the UKFin+ challenge, beating 20+ teams from across the UK.Click For More Information. ↗UK National Cyber Security CTFNATIONAL FINALISTSIEHack The Isles · 2026UK National Cyber Security CTFHack The Isles · 2026UK National Cyber Security CTFRepresented Team Ireland on National Cyber Security CTF competition against all national cyber teams.Click For More Information. ↗TEDx Bournemouth UniversityCONFERENCETETEDx Talk · 2026TEDx Bournemouth UniversityTEDx Talk · 2026TEDx Bournemouth UniversityDelivered a presentation about The Power of Doing: Why Action Beats TheoryClick For More Information. ↗Defence BattleLab DorsetRED & BLUE TEAMINGARMYArmy Cyber Spartan · 2024Defence BattleLab DorsetArmy Cyber Spartan · 2024Defence BattleLab DorsetEnhancing hacking and problem-solving skills in tackling global cyber threats at the Army Cyber Spartan 2024.Click For More Information. ↗OWASP Secure Vibe CodingCONFERENCEOWASPOWASP Dorset · 2026OWASP Secure Vibe CodingOWASP Dorset · 2026OWASP Secure Vibe CodingInvited as a guest speaker to present on building AI-assisted applications using OSINT guardrails.Click For More Information. ↗

Why clients stay with us.

We work with small businesses, enterprises and public-sector teams.

You will understand the report

What we found, how serious it is, and what to fix first. No 400-page PDF.

What we find stays with us

Encrypted handling and a signed NDA before any work starts.

The people testing you compete

Our team is highly professional, delivering all work to the highest standards.

IN THEIR WORDS

What clients say.

The people who hired us, in their own words - on what we found, what we fixed, and what changed afterwards.

“Decimus ran a full security audit of our mobile app and handed us a report that was genuinely easy to follow - no jargon, just what mattered. They then walked us through it and helped us fix everything that needed fixing. I could not recommend them more.”

Talk to Breezi
Becky Weatherley · FounderTalk to Breezi

“We are a care provider, not a tech company, so online security always felt out of our depth. Decimus sent our staff realistic fake scam emails to see who would be caught out - and at first plenty of us were. They then trained the whole team in plain, friendly language. A few weeks later almost nobody was fooled, and our people finally feel confident spotting a dodgy message.”

Meridian Care Group
Jane Whitcombe · Founder & DirectorMeridian Care Group

“Decimus searched the internet for anything linked to our business and showed us what was quietly sitting out in the open - including an old server we had completely forgotten about that still held customer details. They explained it all in language I could actually follow and helped us take it down safely. Knowing someone is keeping an eye out is a real weight off my mind.”

Southcoast Logistics
Mark Pemberton · DirectorSouthcoast Logistics
READY WHEN YOU ARE

Find your weak points before someone else does.

Book a 30-minute scoping call
No cost, no obligation
Held over encrypted video
We tell you what we'd look at and what it would cost