National health insurance agency
SLF · SLCDR- 100,000/day citizen documents inspected
- 5x faster in head-to-head testing
- 2+ yrs uninterrupted production
CUSTOMERS · 2026 EDITION 100+ organizations run on
100+ organizations run on
SecuLetter every day
47 government agencies, 28 financial institutions, 25 defense and manufacturing enterprises — named references, industry threat data, certifications, and procurement records on a single page. Built to drop straight into your audit, procurement, and security review.
- 100+organizations in production
- 10+ yrspurpose-built CDR (since 2015)
- 0service outages
- 100%migration completion rate
CERTIFICATIONS · 01 Evidence that holds up
Evidence that holds up
in audits.
From the Common Criteria, TTA GS, and government procurement listings that public-sector approvals require, to the KISA and Gartner evaluations behind finance security programs — six external proofs stand behind every deployment.
- K100Security Evaluation
KISA APT Evaluation
- GS·1Quality Standard
TTA GS Grade 1
- CCInternational
Common Criteria (CC)
- G2BPublic Procurement
Government Procurement Listed
- GTNAnalyst Coverage
Gartner Email Security
- R&DPatents · R&D
Industry-leading CDR patent portfolio
REFERENCES · 02
Named references, by industry.
Operational references organized across government, finance, and defense. Each case includes deployment scale, the buying trigger, and measured operating outcomes.
Network-separation programs, cross-network file transfer, and public-portal upload gateways for national ministries and agencies.
- Ministry of Science and ICT (MSIT)
- Ministry of Trade, Industry and Energy
- Ministry of Culture, Sports and Tourism
- National Health Insurance Service
- National Pension Service
- Korea Internet & Security Agency
- Korea Electric Power Corporation
- Korea Post
- Korea Institute of Energy Technology Evaluation
- National Tax Service
- Korean National Police Agency
- Public Procurement Service
Korea Internet & Security Agency (KISA)
SLF · SLCDR- 100% detection in APT evaluation
- Unlimited file-size handling
- 12s average analysis
National postal information center
SLF · SLCDR- 30,000users concurrent PDF analysis
- 0 processing delays
- 37Kusers production footprint
Korea Electric Power Corporation (KEPCO)
SLE · SLF- 2,339users protected
- 0 ransomware incidents
- 24/7 uninterrupted production
National energy R&D evaluation agency
DISARM · SLE- 5days company-wide rollout
- 100% BEC impersonation blocked
- 0 user impact
Self-regulated security programs, email gateway replacements, and BEC defense for banks, brokerages, and insurers.
- KB Securities
- Korea Investment & Securities
- Daishin Securities
- DB Insurance
- DAOL Savings Bank
- Korea Insurance Development Institute
- Hana Securities
- Mirae Asset Life
- Hanwha Life
- BNK Busan Bank
- Shinhan Card
- Hyundai Marine & Fire
Major commercial bank
SLE · SLF- 12/13 PoC detection (incumbent: 1/13)
- 92% detection rate
- 3,300users protected
Top-tier brokerage
SLE · DISARM- 0min service downtime
- 3.2wks migration window
- 2,876users production footprint
Regional brokerage
SLE · SLCDR- 1,425users protected
- 12s average analysis
- 100% HWP detection rate
Major brokerage (retail + wholesale)
SLE · ConTI- 912K/day peak throughput
- APT 3 groups attributed
- 100% audit evidence accepted
Insurance industry data exchange
SLCDR- 34ms per-file sanitization
- 309formats preserved
- 0 layout loss
Air-gapped networks, regulated security-suitability environments, and document security at the OT boundary.
- LIG Nex1
- HD Hyundai Oilbank
- Samsung Electronics Sales
- Hyundai Rotem
- Hanwha Aerospace
- POSCO DX
- SK Innovation
- LS Cable & System
- Hyosung Heavy Industries
- Doosan Enerbility
- Celltrion
- SK Bioscience
Defense prime contractor
SLE · DISARM · on-premises- 3,250users company-wide
- 0 logs leaving the country
- 2wks parallel-run cutover
Refining and petrochemical major
SLF · SLCDR- 24/7 uninterrupted production
- 49K/day throughput
- 3stages deep disassembly
National electronics distribution arm
SLE · SLCDR- National sales network coverage
- 160K/day email processed
- 0 incidents in 2 years
University admin networks, academic systems, and student email — gateways serving very large user bases.
- Joongbu University
- Chonnam National University
- GIST
- Korea National Open University
- Dankook University
- Seoul Cyber University
Regional university
SLE · SLCDR- 12,000users protected
- 0 incidents during semester
- 24/7 uninterrupted production
EVIDENCE · DETECTION COMPARISON 13 samples, same environment,
13 samples, same environment,
different results.
Benchmark test at a major commercial bank, 2019 — identical samples, identical environment. Across 13 non-executable attachments, the behavior-based solution flagged 1; SecuLetter flagged 12.
Behavior-based sandbox vendor
1 /13
Sandbox-based — detonates the file in a virtual environment and observes behavior. Non-executable files with no runtime behavior are, by design, undetectable. Detection drops further the moment evasion techniques — VM detection, time delays, user-trigger gating — come into play.
- Non-executable attachments missed by design
- 3–5 minute sandbox latency — mail delivery delays
- Low accuracy on document-borne formats
SecuLetter SLF (MARS engine)
12 /13 92% detection
Reverse-engineering based — disassembles the file structure for static analysis. Identifies structural anomalies without executing the code. Non-executable attachments, evasion techniques, and document-borne formats are caught at the same accuracy.
- Non-executable files analyzed at the structural level
- 12-second average — no mail delays
- Full coverage of HWP, HWPX, and PostScript document formats
Benchmark test at a major commercial bank, 2019, identical samples. Comparisons reference behavior-based and sandbox-based detection vendors as a category.
ALL CUSTOMERS · 04
47 government, 28 finance, 25 defense and manufacturing
A subset is shown here. For audit response or RFP review, reach out to your account manager for the full named-organization list.
NHIS 
NPS 
KISA 
KEPCO 
Korea Post 
KOTRA 
KOICA 
KETEP 
MSIT 
Ministry of Trade, Industry and Energy 
Ministry of Culture, Sports and Tourism 
KAMCO 
KB Securities 
Korea Investment & Securities 
Daishin Securities 
BNK Busan Bank 
DB Insurance 
eBest Securities 
KSD 
LIG Nex1 
HD Hyundai Oilbank 
Samsung Electronics Sales 
Seoul Semiconductor NHIS NPS KISA KEPCO Korea Post KOTRA KOICA KETEP MSIT Ministry of Trade, Industry and Energy Ministry of Culture, Sports and Tourism KAMCO KB Securities Korea Investment & Securities Daishin Securities BNK Busan Bank DB Insurance eBest Securities KSD LIG Nex1 HD Hyundai Oilbank Samsung Electronics Sales Seoul Semiconductor Seoul Semiconductor Samsung Electronics Sales HD Hyundai Oilbank LIG Nex1 KSD eBest Securities DB Insurance BNK Busan Bank Daishin Securities Korea Investment & Securities KB Securities KAMCO Ministry of Culture, Sports and Tourism Ministry of Trade, Industry and Energy MSIT KETEP KOICA KOTRA Korea Post KEPCO KISA NPS NHIS Seoul Semiconductor Samsung Electronics Sales HD Hyundai Oilbank LIG Nex1 KSD eBest Securities DB Insurance BNK Busan Bank Daishin Securities Korea Investment & Securities KB Securities KAMCO Ministry of Culture, Sports and Tourism Ministry of Trade, Industry and Energy MSIT KETEP KOICA KOTRA Korea Post KEPCO KISA NPS NHIS NEXT STEP · 06 Join the 100+ organizations
Join the 100+ organizations
already protected.
PoC, benchmark testing, architecture review, migration — the further outside the catalog, the more directly our engineers respond. Average response within 0.8 business days for government, finance, and defense buyers.
- 100+organizations adopted
- 10 yrspurpose-built CDR
- 0service outages
- 0.8business-day response