The following is the RSA digital signature algorithm: 1.
Calculate the hash value of the data packet: This will provide the data integrity guarantee as the hash can be computed at the receiver’s end again and matched with the original hash to check whether the data has been modified in transit.
How Identity and Authenticity Are Verified (Part 2)
Technically, message signing can work without hashing the data first, but is not considered secure.
Signs the hash value with the signer’s private key: As only the signer has the private key, the authenticity of the signature and the signed data is ensured.
Digital signatures have some important properties, such as authenticity, unforgeability, and nonreusability.
Authenticity means that the digital signatures are verifiable by a receiving party.
The unforgeability property ensures that only the sender of the message can use the signing functionality using the private key.
In other words, no one else can produce the signed message produced by a legitimate sender.
Why This Matters for Blockchain Technology
Nonreusability means that the digital signature cannot be separated from a message and used again for another message.
The operation of a generic digital signature function is
These two approaches to using digital signatures with encryption are as follows.
Key Points to Remember
- RSA digital signature algorithm The following is the RSA digital signature algorithm: 1.
- Calculate the hash value of the data packet: This will provide the data integrity guarantee as the hash can be computed at the receiver’s end again and matched with the original hash to check whether the data has been modified in transit.
- Technically, message signing can work without hashing the data first, but is not considered secure.
- Signs the hash value with the signer’s private key: As only the signer has the private key, the authenticity of the signature and the signed data is ensured.
Conclusion
RSA digital signature algorithm represents one of the many innovative layers that make blockchain technology so powerful and transformative. As distributed systems continue to evolve, a solid understanding of these core concepts becomes increasingly valuable — not just for developers, but for anyone building, investing in, or working alongside blockchain-powered systems.
Whether you are just starting your blockchain journey or deepening existing expertise, mastering these fundamentals gives you the tools to think clearly about decentralized systems and make smarter decisions in this rapidly evolving space.