What is a scramble keypad?

A scramble keypad (also called a scramblepad) is a PIN entry device that presents a new random digit layout each time it is activated (by pressing *). The layout stays fixed while the user enters their PIN — terminated automatically at a preset digit count or by pressing #. Because the digit-to-key mapping is unique to each activation, an observer or camera cannot determine the PIN from watching which physical keys are pressed.

How does Codeguard's scramble keypad defeat shoulder-surfing?

When the user presses * to activate the Codeguard keypad, its 10 digits are randomly assigned to the physical keys in a layout unique to that session. The layout remains fixed while the PIN is entered. An observer or camera can only record which physical keys were pressed — not the digit values those keys carried in that activation. Even with video footage, the digit-to-key mapping for that session is unknown, making the recording useless to an attacker.

How do I order a Codeguard scramble keypad?

Codeguard Security supplies worldwide. To order, submit an enquiry via the website at codeguardsecurity.com, call +44 (0)1763 260294, or email mail@codeguardsecurity.com. You will receive a pro-forma invoice by return email detailing the total cost including shipping.

Patented Worldwide · Est. 1995

The World's Leading Scramble Keypad for Access Control

Q: Where are Codeguard keypads used?

Codeguard scramble keypads are used in high-security environments worldwide including airports, banks and vaults, courtrooms, dockyards, government buildings, hospitals, military facilities, parliament buildings, railways, IT server rooms, and other critical infrastructure.

Press * to activate a unique scrambled layout — then enter your PIN. Because the digit arrangement is different every time the keypad is activated, shoulder-surfing and camera replay attacks are physically impossible. Trusted by governments, airports, and banks worldwide.

View Products See How It Works

30+

Years in service

Output protocols

IP65

Weatherproof

ADA

DDA compliant

Codeguard scramble keypad — a new scrambled layout on every activation

New scrambled layout on every activation.
Observers can never determine the PIN.

Technology

Why Scramble? Why It Matters.

Standard keypads have fixed digit positions — a weakness any camera or observer can exploit. Codeguard eliminates this permanently.

Press * to Activate

The user presses * to wake the keypad. The 10 digits are instantly assigned to the physical keys in a unique random layout for that session.

User Enters Code

The user reads the scrambled display and presses the physical keys matching their PIN digits. The layout stays fixed throughout entry — terminated automatically at a preset digit count, or with #.

Camera Replay Fails

Even with video footage, an attacker cannot determine the PIN — because the digit-to-key mapping is unique to that session.

Features & Certifications

Built for the Toughest Environments

Patented technology backed by global certifications and over 30 years of field-proven reliability.

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Patented Worldwide

The scramble keypad concept is protected by international patents with no direct equivalent on the market.

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Multiple Output Protocols

Wiegand and RS232 outputs make the keypad compatible with virtually any access control system.

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IP65 Weatherproof

Fully sealed against dust and water jets. Suitable for outdoor installation in all weather conditions.

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ADA/DDA Compliant Options

Stainless steel mounting options meet ADA (US) and DDA (UK) accessibility standards.

Certifications

FCC Part 15 Class A

CE Certified

IP65 (BS EN 60529:1992)

ISO 9001:2000

IPC 610A-D

RoHS Compliant

WEEE Compliant

ADA / DDA Compliant

Technical Highlights

12V DC operation

Tamper detection

Backlit keys

-20°C to +60°C

Wiegand 26-bit

RS232 output

Worldwide supply

FAQ

Frequently Asked Questions

Everything you need to know about scramble keypads and how Codeguard works.

A scramble keypad (also called a scramblepad) is a PIN entry device that presents a new random digit layout each time it is activated. The user presses * to wake the keypad and see the scrambled layout, enters their PIN, then terminates entry automatically (at a preset digit count) or by pressing #. Because the digit-to-key mapping is unique to each activation, an observer or camera cannot determine the PIN from watching which physical keys are pressed.

When the user presses * to activate the Codeguard keypad, its 10 digits are randomly assigned across the physical keys in a layout unique to that session. The layout stays fixed while the PIN is entered. An observer watching can only see which physical key positions are pressed — not the digit values those keys carried in that activation. Even with video footage, the digit-to-key mapping for that session is unknown, making the recording useless to an attacker.

The Codeguard scramble keypad is available in two output versions: Wiegand 26-bit (compatible with virtually all access control panels) and RS232 serial (for direct PC and server integration). All variants are available in grey and black finishes.

Yes. The Codeguard SERlll keypad carries an IP65 weatherproof rating (BS EN 60529:1992), meaning it is fully sealed against dust and water jets. Its operating temperature range is −20°C to +60°C, making it suitable for outdoor installation in all weather conditions.

The Codeguard scramble keypad holds the following certifications: CE, FCC Part 15 Class A, IP65 (BS EN 60529:1992), ISO 9001:2000, IPC 610A-D, RoHS, WEEE, and ADA/DDA compliance for accessible installations.

Codeguard scramble keypads are deployed in high-security environments worldwide, including airports, banks and vaults, courtrooms, dockyards, government buildings, hospitals, military facilities, parliament buildings, railways, IT server rooms, and other critical infrastructure.

Codeguard Security supplies directly to end users and integrators worldwide. Submit an enquiry using the form below, call +44 (0)1763 260294, or email mail@codeguardsecurity.com. You will receive a pro-forma invoice by return email detailing the full cost including shipping.

Enquire / Order

Request a Pro-Forma Quotation

Select your products and submit your details — we'll reply by email with a full quotation including shipping to your location worldwide.

Codeguard Security Ltd.

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Address 3 Saxon Way, Melbourn
South Cambridgeshire, SG8 6DN
United Kingdom

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Telephone +44 (0)1763 260294

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Email mail@codeguardsecurity.com

You will receive your pro-forma invoice / quotation by return email, detailing total cost including shipping and payment methods.

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