Abstract: Method and system for creating an amount of digital currency comprising generating a currency create signature by cryptographically signing currency data using at least a currency creator secret key. generating verifiable create data suitable for addition to a digital currency ledger, wherein the create data comprises the currency data and the currency create signature, the currency data comprising a value of the amount of new digital currency and currency key data based at least in part on a currency public key, wherein the currency public key corresponds to the amount of digital currency.

Abstract: Method and system for transferring digital currency from a payer to recipient comprising receiving an identifier of data describing the first entity. Retrieving an entry from a block chain based on the received identifier. Authenticating the entry using a public key of the second entity. Extracting the data describing the first entity from the retrieved entry. Authenticating a block in the block chain containing the entry using a public key of a third entity. If the authentication of the block in the block chain is successful then transferring digital currency from a payer to a recipient, wherein the first entity is the payer or the recipient, and wherein transferring digital currency from the payer to the recipient comprises the payer. Obtaining wallet public key data associated with the recipient. Generating, using at least the wallet public key data, a currency public key for the amount of digital currency to be transferred to the recipient.

Abstract: A user inputs a pattern consisting of a plurality of lines. The lines are classified by relative length, overall direction and degree of curvature. Where a line is started from a new position, the direction from the previous starting point is taken into account. The series of lines is then serialized into a key value, which may then be used to decrypt data stored on a device. This enables data to be securely stored since the key is supplied by the user at runtime and is not itself stored on the device.

Abstract: A user is registered for an electronic peer-to-peer payment system by authenticating the user at an automated teller machine (ATM), receiving the user's mobile number and addressing a verification code to the user's mobile number, which the user must enter in order to be registered.

Abstract: A user inputs a pattern consisting of a plurality of lines. The lines are classified by relative length, overall direction and degree of curvature. Where a line is started from a new position, the direction from the previous starting point is taken into account. The series of lines is then serialised into a key value, which may then be used to decrypt data stored on a device. This enables data to be securely stored since the key is supplied by the user at runtime and is not itself stored on the device.