Post-quantum native. For firms entrusted with critical information.

Quantum-proof by default.

Every document is locked under post-quantum encryption the moment it enters the room. Your team opens and shares files in a click. Outsiders, and tomorrow's quantum computers, get nothing.

Book a demo → See it work

Built for diligence teams. The room can never read your files. CNSA 2.0 aligned.

Diligence RoomQUANTUM-SAFE

14 documents 3 parties

Financial_Model_v7.xlsxSealed

Purchase_Agreement.pdf

IP_Disclosures.zipSealed

Cap_Table.xlsxSealed

counsel@firm opened Cap_Table.xlsxjust now

Post-quantumZero-knowledgeHybrid-sealedCNSA 2.0

BUILT FOR THE TEAMS THAT HANDLE THE MOST SENSITIVE TRANSACTIONS

M&A AdvisoryPrivate EquityIPO CounselCorporate LegalRegulated Finance

Why this matters now

A deal closes in months.
Its secrets must hold for decades.

THE THREAT, HARVEST NOW DECRYPT LATER

Stolen today, opened tomorrow

Attackers do not need to break encryption now. They copy sensitive files today and store them, waiting for quantum computers to unlock everything later. For a deal room, your diligence files could be read years after the deal closes.

THE FIX, POST-QUANTUM BUILT IN

Sealed against the quantum era

Kybran is post-quantum native. Every file is protected with encryption designed to withstand quantum computers, not bolted on, but the foundation. Conventional data rooms can't be opened later. Kybran can't either, by design.

How it works

Sealed before it ever reaches the server

Every step happens on your device. The room stores files it cannot open, and neither can anyone who steals them.

01

Sealed on device

Each document is sealed in the uploader's browser before anything is sent.

02

Quantum-safe by default

Every file is post-quantum protected automatically. No setting to forget.

03

The room holds ciphertext

Only sealed contents reach the room. Nothing readable, nothing worth stealing.

04

Access by cryptography

Adding a party grants access cryptographically, not by flipping a flag.

See it work

Don't take our word for it. Seal something.

This runs genuine quantum-safe encryption live in your browser, nothing simulated. Seal a confidential line or a file, and watch what the room would store versus what stays unreadable.

Seal a document

Type a confidential line or upload a file. It is sealed on this device, nothing leaves the page.

or drop a file here (under 2 MB)

SAVE KEY AS

// what the data room stores

Awaiting input. Seal something to run live quantum-safe encryption.

Your key vault stored only in this browser, never on Kybran

No keys yet. Seal a document above and its key is saved here under your chosen name.

Keys live on your device. Kybran stores only sealed contents and can never read your files.

The difference

What every other data room cannot promise

Conventional data rooms protect files with encryption a quantum computer will eventually break, and their servers can read what you store. Kybran is built the opposite way.

CONVENTIONAL DATA ROOMS

Protected for now

Encryption that a future quantum computer can break.
Files readable by the provider's own servers.
Exposed to harvest now, decrypt later collection.
Security added on top of a system never designed for it.

KYBRAN

Protected for decades

Post-quantum encryption built into the foundation.
Sealed on your device. The room can never read your files.
Useless to anyone who harvests it today.
Quantum-safe and zero-knowledge from the first line of code.

See Kybran on one of your live matters

We are onboarding a small group of design-partner firms. Book a walkthrough and we will set up a quantum-safe room for a real deal.

Book a demo →

What Kybran does

Locked to outsiders. Open to your team.

Kybran is a quantum-safe data room for transactions and matters whose confidentiality must outlast today's encryption. Documents are sealed on your device, the room can never read them, and access is granted party by party.

Quantum-safe storage

Every file is sealed before it leaves your device with post-quantum encryption built into the foundation, not added as an option.

Controlled sharing

Grant access to named counterparties one by one. Access is enforced cryptographically, so a permission is a fact, not a flag the server could flip.

Zero-knowledge by design

Kybran's servers store only sealed contents. We can never read your files, and neither can anyone who breaches or harvests the storage.

Key control and recovery

Keys stay in your custody. Back them up, move them to a USB drive, or wipe them, and recover access through controls your organization holds, never us.

Audit trail

A tamper-evident record of who accessed what and when, the accountability a diligence process and your counsel both require.

Document integrity

Every sealed file is verifiable, so a recipient knows a document is exactly what was placed in the room, unaltered.

Who it is for

Built for the rooms where a leak ends careers

See how each kind of firm uses Kybran on the Industries page.

M&A AND PRIVATE EQUITY

Diligence and deal rooms

Buy-side and sell-side diligence, valuation models, IP disclosures, fund and portfolio reporting.

LEGAL

Privileged material

Privileged matter exchange, litigation holds, board books, and internal investigations.

CAPITAL MARKETS

Pre-listing material

S-1 drafts, underwriter material, and pre-listing financials shared under embargo.

REGULATED FINANCE

Long-lived secrets

Any institution holding data that must stay confidential well into the quantum era.

See it on one of your live matters

We are onboarding a small group of design-partner firms. Book a walkthrough and we will set up a quantum-safe room for a real deal.

Book a demo →

Who it serves

How your firm uses Kybran.

The same quantum-safe foundation, shaped to the way each kind of firm actually works. Pick the one closest to you.

Dealmaking & advisory Legal & governance Capital markets

Dealmaking & advisory

M&A, private equity, and corporate development

Diligence rooms hold the most valuable secrets a firm touches, and they have the longest tail of risk. A model or term sheet copied today could be read years after the deal closes. Kybran seals every file on the dealmaker's device and lets the room hold nothing it can read.

USE CASE

Buy and sell-side diligence

Valuation models, management presentations, and data-room exhibits sealed before they ever reach the server, shared party by party to bidders and advisors.

USE CASE

Fund and LP reporting

Portfolio marks, capital accounts, and side letters distributed to LPs with cryptographic access control, not a permissions flag a server could flip.

USE CASE

Bidder isolation

Each counterparty sees only what was sealed to them. Revoking a bidder removes their key, not just a checkbox, so harvested copies stay unreadable.

Legal & governance

Law firms, general counsel, and the board

Privilege is only as strong as the room that holds it. Litigation files, board materials, and investigation records must stay confidential for years, and a future decryption is the same breach as a present one. Kybran keeps privileged material sealed end to end.

USE CASE

Privileged exchange

Counsel and co-counsel exchange privileged matter files in a room neither the provider nor an intruder can read.

USE CASE

Board materials

Board books and committee packets sealed to each director, with a tamper-evident record of who opened what.

USE CASE

Investigations & holds

Internal investigations and litigation holds where confidentiality and an auditable chain of access both matter.

Capital markets

Underwriters, issuers, and IPO counsel

Pre-listing material moves between many parties under embargo, and a leak is both a legal and a market event. Kybran keeps S-1 drafts, underwriter materials, and pre-listing financials sealed and shared only with the syndicate members who need them.

USE CASE

Pre-listing drafts

S-1 and prospectus drafts circulated to underwriters and counsel, sealed on device and revocable by key.

USE CASE

Syndicate distribution

Underwriter materials shared across the syndicate with per-party access, so embargoed financials never sit in readable storage.

USE CASE

Regulated archives

Records that must remain confidential well past the offering, protected against harvest-now-decrypt-later for the full retention period.

See it for your kind of firm

Book a walkthrough and we will set up a quantum-safe room shaped to how your team actually works.

Book a demo →

Security at Kybran

Designed so the room can't read your files.

Security is not a feature we added. It is the reason Kybran exists. Here is how it works, in plain terms, and an honest account of where we are today.

THE THREAT

Harvest now, decrypt later

Adversaries do not wait to break encryption. They copy sensitive files today and store them, expecting quantum computers to unlock everything later. For long-lived secrets, the deadline is already here.

OUR APPROACH

Post-quantum native

Every file is protected with encryption designed to withstand quantum computers, combined with proven conventional encryption so that both must be defeated to read anything. It is the approach today's standards bodies recommend for the transition.

ARCHITECTURE

Sealed on your device

Documents are encrypted in your browser before they are ever sent. The room receives sealed contents it cannot open. Plaintext never reaches our servers.

ACCESS

Zero-knowledge, key in your custody

Keys stay with you. Kybran holds no master key and has no way to read your files. Recovery is rooted in controls your organization holds, never a back door on our side.

How a document is sealed

Four steps, all on your device

01

Sealed on device

The file is encrypted in your browser before anything is sent.

02

Quantum-safe by default

Post-quantum protection is automatic. There is no weaker setting to choose.

03

The room holds ciphertext

Only sealed contents are stored. Nothing readable, nothing worth harvesting.

04

Access by cryptography

Adding a party grants access cryptographically, not by a database flag.

Our posture and roadmap

Honest about where we are

A security product earns trust by being precise about its limits. Here is ours.

What is true today

Post-quantum and conventional encryption combined, so both must break.
Built on standardized, peer-reviewed algorithms. No hand-rolled cryptography.
Files sealed on-device, keys in your custody, zero-knowledge storage.

What is in progress

Independent third-party security review.
A hardened production backend with full audit logging.
Formal compliance posture for regulated buyers.

Have your security team take a closer look

We welcome scrutiny. Book a walkthrough and bring your toughest questions.

Book a demo →

About Kybran

So Q-Day is never a surprise.

Kybran was founded in New York to make sure the firms entrusted with the world's most sensitive information are never caught off guard when quantum computers break today's encryption.

The day a quantum computer can break today's encryption, often called Q-Day, will not arrive with a warning. The danger is already here. Sensitive files are being copied and stored now, to be opened the moment that day comes.

For the firms that hold the most valuable secrets, in mergers, private capital, public offerings, and the law, that is not a distant risk. A document sealed today may still need to stay secret for a decade or more.

We built Kybran so those firms can act before Q-Day, not after. A data room that is quantum-safe from the foundation, where files are sealed on your own device and the room itself can never read them.

What we believe

That the standard for handling sensitive information should be set now, not scrambled for later. That security worth trusting is built in, not bolted on. And that the institutions safeguarding the most important transactions deserve protection that outlasts the encryption everyone else still relies on.

Where we are

Kybran is early and honest about it. We are building deliberately, working with a small group of design-partner firms, and we say plainly what is proven today and what is still ahead. If that mission resonates, as a firm, a partner, or a builder, we would like to talk.

Help set the standard for the quantum age

Whether you are a firm that needs this or someone who wants to build it, start a conversation.

Book a demo →

Get in touch

Let's talk about your most sensitive room.

The best way to understand Kybran is a live walkthrough. Tell us a little about your firm and we will reach out, or book a time directly.

Request a walkthrough

Send us a few details and we will set up a 30-minute demo. See the data room, the sealing flow, and bring your security questions.

Request a demo →

Design-partner program

We are onboarding a small group of M&A, private equity, legal, and capital-markets firms to pilot Kybran on live matters. If that is you, send a request and mention your firm.

Request a pilot →

Book a demo

Request your walkthrough.

Tell us a little about your firm. We will reach out to set up a live, quantum-safe data room for a real matter.

Name *

Work email *

Firm *

Phone *

Role / title (optional)

Industry (optional)

What matter would you use this for? (optional)

Sent securely to Kybran. We will only use this to contact you about a demo.

Quantum-proof by default.

A deal closes in months.Its secrets must hold for decades.

Stolen today, opened tomorrow

Sealed against the quantum era

Sealed before it ever reaches the server

Sealed on device

Quantum-safe by default

The room holds ciphertext

Access by cryptography

Don't take our word for it. Seal something.

Seal a document

What every other data room cannot promise

Protected for now

Protected for decades

See Kybran on one of your live matters

Locked to outsiders. Open to your team.

Quantum-safe storage

Controlled sharing

Zero-knowledge by design

Key control and recovery

Audit trail

Document integrity

Built for the rooms where a leak ends careers

Diligence and deal rooms

Privileged material

Pre-listing material

Long-lived secrets

See it on one of your live matters

How your firm uses Kybran.

M&A, private equity, and corporate development

Buy and sell-side diligence

Fund and LP reporting

Bidder isolation

Law firms, general counsel, and the board

Privileged exchange

Board materials

Investigations & holds

Underwriters, issuers, and IPO counsel

Pre-listing drafts

Syndicate distribution

Regulated archives

See it for your kind of firm

Designed so the room can't read your files.

Harvest now, decrypt later

Post-quantum native

Sealed on your device

Zero-knowledge, key in your custody

Four steps, all on your device

Sealed on device

Quantum-safe by default

The room holds ciphertext

Access by cryptography

Honest about where we are

What is true today

What is in progress

Have your security team take a closer look

So Q-Day is never a surprise.

What we believe

Where we are

Help set the standard for the quantum age

Let's talk about your most sensitive room.

Request a walkthrough

Design-partner program

Request your walkthrough.

Request received

A deal closes in months.
Its secrets must hold for decades.