RFID Protection - ravensystem

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RFID Blocking

RFID (Radio Frequency Identification) is a contactless system able to read out data from a transponder chip by a RFID reader via radio waves.

Contactless sytems are also sometimes called
NFC (near field communication) when the chip has to be put into close proximity with the reader in order to be read.

The transponder chips are very small, so they can be fitted into all kinds of documents and cards storing
personal data, PINs, account balances, etc..

When it comes to RFID blocking material safeguarding all types of RFID/NFC cards of consumers and passports is the main challenge.

It is the maximum degree of attenuation that counts, not just some degree of attenuation, as is the case for aluminium, aluminium composite film or non wovens coated with aluminium or fabrics with metal threads or paper/fabrics coated with zinc or copper.

Consumers usually don’t know the frequencies at which their ID cards, Bank Cards or Passports operate (125KHz, 13.56MHz, 800-900MHz). So they have to rely on the material with the best attenuation degree.  

The only TÜV-certified RFID blocking material that protects personal data, PINs, account balances, etc. AND guarantees the highest attenuation level is CRYPTALLOY®.


  • Cryptalloy® is an RFID-shielding foil that blocks the RFID signals for all common RFID frequencies.

  • It protects the digital privacy.

  • It turns pouches, bags, covers, luggage and cases to data safes for personal and biometric data.

  • Any Unauthorized Access to the data stored on the RFID chip is excluded by this RFID Blocking foil and has been tested and certified by SGS-TUV Saarland Forster GmbH for shield attenuation and approved for shielding against unauthorized readout from RFID/NFC Chips.

  • CRYPTALLOY® blocks the signal for all common RFID-frequencies such as 125 kHz LF or 13.56 Mhz HF.

TÜV certification proving Crypalloy's blocking capabilty


Through the dissemination of wireless identification (RFID) data theft has become far easier. Instead of having to come into physical contact with the card to copy them illegally or to use them directly, RFID reading of information is possible using quite simple means without any contact from a distance of up to several meters.

Problem compared to conventional theft:

The cardholder might not realize that he is the victim of a data thief. This keeps the unauthorized person ample time to make any number of duplicate keys and gain access to your premises.

Common RFID use:

A lot of access to premises or offices is now managed by wireless RFID tags, and loss of the data is an especially critical situation when the badges of your employees may also contain personal information such as name and date of birth, which may additionally be otherwise misused.

The modern passport also uses an RFID chip to hold all the persons private details (and although encrypted the encryption was cracked within a week of the passports first being put into service!).

These are much greater danger potentials for people, which extend well into the privacy of individuals and may result in very serious consequences, and not just the loss of money...

Small and inconspiciuous:

RFID-Tags, so-called transponders, are available in many different shapes and sized and also work with car theft protection systems.

However, even if the company IDs are only a simple number is stored and the actual data is housed in a central database, there is still a great danger:

The unauthorized reading of this number only takes a fraction of a second, and when copied onto a blank card it will result in a spare key which your system will recognize as the original key.

Encryption methods offer some protection, but not for long.

Finally, the data thief usually has plenty of time to decipher with a powerful computer and brute-force attack the data. But for just just making a duplicate key, there is no need to decrypt the data, the information is just copied to blank card.

The Data theft:

The scenarios for data theft are variable. It can be from the next table in the restaurant where you are having lunch, on the escalator or the elevator, the unassuming passenger next to you on public transport, the queue at the supermarket checkout, or even the visitors in your own house.

For technical reasons, the RFID chip on your card is communicating his data to anyone who asks him about it.

The Protection Solution:

To counteract this situation we use Cryptalloy® Foil as an interlining in our security products. This material was developed by Kryptronic Technologies. It is a complex alloy of aluminum and other specialty metals that highly effectively suppresses communication between your RFID cards and any unauthorized reader.

An Amazing Trick:

In order to achieve an effective shield, the RFID card does not even have to be surrounded by Cryptalloy® (forming a Faraday cage), the mere presence of the material in the immediate vicinity (quasi-contact) is already sufficient...

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