Method and a system for a secure execution of workflow tasks of a workflow in a decentralized workflow system

A computer-implemented system, comprising:

• a plurality of task execution agents, the plurality of task execution agents including an i'th execution agent, the i'th execution agent implemented by one or more processors and configured to:
• receive, from a preceding execution agent from the plurality of task execution agents, a task-based private key generated by the preceding execution agent;
• sign workflow information of a workflow for a subsequent execution agent with a workflow signature, the workflow signature being computed using a workflow signature scheme by taking as input at least the task-based private key;
• and
• forward, to a subsequent execution agent from the plurality of task execution agents, the workflow information with its associated workflow signature;
• wherein the i'th execution agent is further configured to compute the task-based private key for the subsequent execution agent, the task-based private key being computed using system parameters and a workflow identifier assigned to the subsequent execution agent, the workflow information further being forwarded with the task-based private key.

A non-transitory computer-readable medium storing executable instructions thereon, which, when executed by a processor, cause the processor to perform operations comprising:

• receiving, from a preceding execution agent from a plurality of task execution agents, a task-based private key generated by the preceding execution agent;
• signing workflow information of a workflow for a subsequent execution agent with a workflow signature, the workflow signature being computed using a workflow signature scheme by taking as input at least the task-based private key;
• forwarding, to a subsequent execution agent from the plurality of task execution agents, the workflow information with its associated workflow signature;
• and
• computing the task-based private key for the subsequent execution agent, the task-based private key being computed using system parameters and a workflow identifier assigned to the subsequent execution agent, the workflow information further being forwarded with the task-based private key.