A code-generating device (6a-c) for enabling interaction with dynamic security between a user (2a-c) and a transaction service provider (3). The code-generating device (6a-c) includes information acquisition means (51, 52) and processing circuitry (60). The processing circuitry (60) is configured to receive, via the information acquisition means (51, 52), a transaction-specific code generated by the transaction service provider (3), evaluate the transaction-specific code, perform, based on the evaluation of the transaction- specific code, a transaction-specific sequence of predetermined functions, each involving prompting the user (2a-c) to indicate a respective function- related value, resulting in a sequence of function-related values indicated by the user, and determine a transaction-specific response code based on the sequence of function-related values, thereby enabling secure authentication of the transaction.
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