cloudAshur KeyWriter

The iStorage patented* cloudAshur KeyWriter application enables the required number of cloudAshur modules to be cloned with the same encrypted encryption key allowing real-time, ultra-secure collaboration with authorised users regardless of location.

*GB2566107, GB2579884A

Connect your cloudAshur modules

Clone the master device encryption key

Collaborate securely

Setting the standard for secure collaboration

Sharing encrypted data securely allows for instant collaboration in the cloud, granting flexibility of working across departments, countries or organisations and saving time in what would be days of posting encrypted USB flash drives to and from colleagues.

With the cloudAshur, only authorised users with a cloned cloudAshur encryption module can decrypt and view data.

cloudAshur KeyWriter copies all critical security parameters including the randomly generated encrypted encryption key and all PINs between the Master cloudAshur module and as many Secondary cloudAshur modules as required using any off the shelf USB hub.

This allows secure and instant collaboration in the cloud between authorised users, as well securely sharing encrypted files on a local network drive, portable data storage device or via email and file transfer services.

Cloning process

The process of copying the encrypted encryption module key and all critical credentials between the Master cloudAshur module and Secondary cloudAshur modules is protected by a secure protocol incorporated within the iStorage cloudAshur secure microcontroller.

The protocol is implemented using cryptographic algorithms, all of which are FIPS certified. Every cloudAshur has a unique certificate issued by a root of trust, which ensures that only iStorage cloudAshur modules can be used during the key exchange process.

You can't hack what you can't see

The KeyWriter software has zero visibility of both the session key and decrypted data. This makes it impossible for a hacker to access or retrieve any critical security parameters stored within the cloudAshur module.

Frequently Asked Questions


Does iStorage offer a trial period of the cloudAshur?

Yes. Should you wish to test any of our devices using our free 30-day evaluation programme, please click here to submit your evaluation request. Alternatively, contact sales@istorage-uk.com to request an evaluation form. 

I have bought over 500 cloudAshur devices. Can iStorage set up the PINs for me?

Yes, we are able to configure the PINs for you. For details on pricing, please contact an iStorage Account Manager:

T: +44 (0)20 8991-6260

E: sales@istorage-uk.com  

cloudAshur KeyWriter

Is there a limit to how many cloudAshur modules you can clone using the iStorage KeyWriter Application?

There is no limit to how many cloudAshur modules you can clone using the iStorage KeyWriter Application. Depending on your USB port hub, you can clone 1 to 9 cloudAshur modules at a time, then repeat the process if you have more than 9 cloudAshur modules. For enterprises using a large number of cloudAshur modules, iStorage can perform the KeyWriter process on behalf of the company upon request.

Is it possible to share an encrypted file, via email or file sharing service, to a third party who does not have a cloudAshur device?

As the third party does not have the cloudAshur module where the encryption/decryption key is stored, the user is unable to read the data. Only authorised users with a cloned cloudAshur encryption module can decrypt and view the files shared. 


Find out more on how can you encrypt your data securely using the cloudAshur


Find out more on how can you manage your users using the cloudAshur


Choose the right capacity for your needs.

Get help

Any questions? Call a specialist or chat online.

+44 (0) 20 8991 6260

Chat now >

Technical specifications


Hardware Security Module (patent pending)


FIPS PUB 197 certified USB 3.0 encryption controller


3.7V Li-Polymer Rechargeable Battery


Dimensions - H/W/D

87.40mm / 19.40mm / 13.40mm


cloudAshur is compatible with both Windows (7/8/10) and macOS (Sierra/High Sierra/Mojave/Catalina) and works with numerous cloud providers including Amazon Drive, AWS with Amazon WorkDocs Drive, Google Drive, OneDrive, Dropbox/Dropbox Business, iCloud, Box with Box Sync, Egnyte, GSuite with Drive File Stream, HornetDrive, iDrive, Jottacloud/Jottacloud Business, MEGA/MEGA Business, pCloud Drive/pCloud Business, Synx.com/Sync.com Business, Tresorit/Tresorit Business, Yandex, Microsoft Azure File Storage with the 3rd party software "GoodSync" and many more. (All listed cloud providers have been tested by iStorage)

Hardware data encryption

Can be configured in two encryption modes AES-ECB 256-bit (FIPS Compliant) and AES-XTS 256-bit.


FIPS 140-2 Level 3, NLNCSA BSPA & NATO Restricted Level (Pending Q3/Q4)


Ordering information

iStorage Part Number: IS-EM-CA-256


3 years warranty with free lifetime technical support

iStorage cloudAshur is developed and manufactured by iStorage Ltd.


  • PIN authenticated, hardware encrypted, cloud encryption module (patents pending)
  • Five factor authentication
  • On-device Crypto-chip
  • Brute force hack defence mechanism
  • Compatible with Windows and macOS
  • Auto lock on removal
  • Two encryption modes – AES-XTS 256-bit & AES-ECB 256-bit
  • Incorporates a Common Criteria EAL 5+ (Hardware Certified) secure microprocessor
  • FIPS Level 3 compliant tamper proof & evident design
  • Polymer coated, wear resistant on-board alphanumeric keypad
  • Immune to Bad USB
  • Whitelisting on networks
  • IP68 certified (dust & waterproof)
  • User PIN enrolment
  • Separate Admin and User modes
  • Self-destruct feature
  • Inactivity Auto-lock
  • One-time User recovery PIN
  • Customisation services available


Now available to buy!

Get help

Any questions? Call a specialist or chat online.

+44 (0) 20 8991 6260

Chat now >

Please choose options

Buying options

cloudAshur is compatible with both PCs and MACs and works with numerous cloud providers including, Amazon Drive, Google Drive, OneDrive, Dropbox, iCloud and many more.

cloudAshur KeyWriter (patent pending) makes sharing of data in the cloud, via email and file transfer services (e.g. WeTransfer) between authorised users a breeze with ultimate security and peace of mind, allowing users to securely share data with one another, in real-time, regardless of location.

cloudAshur Remote Management console gives you full control of all cloudAshur hardware security modules deployed within your organisation, offering a wide range of features to manage and monitor all users.

iStorage Part Number: IS-EM-CA-256

Softwares are compatible with cloudAshur encryption modules only. Software images are for illustration purposes only(Available via download only).

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