System and method for encryption

A validation device for a user to validate a signature generation request for a first message M, the validation device comprising a memory storing instructions that configure the validation device to:

• receive, via an input-output system of the validation device, a validation challenge from a signature creation device, the validation challenge having been created by the signature creation device, in response to receiving said signature generation request and said first message M from a user, using a second message M′ which is based on the first message M and a first secret shared between said signature creation device and said validation device, wherein said validation challenge is generated by encrypting said second message M′ using said first shared secret;
• generate, using a processor of the validation device, the second message M′ from the validation challenge by decrypting said validation challenge using the first shared secret;
• display the second message M′ to the user on a display of the validation device;
• receive confirmation from the user via a user interface of the validation device that the second message M′ as displayed corresponds to the first message M;
• generate, using said processor, a validation code confirming to create the signature generation request;
• and
• output the validation code via the input-output system to the signature creation device, to cause the signature creation device to generate a digital signature for the user for the first message M based on a successful verification of the validation code.