To verify a digital signature and validate the integrity of data using SHA256, you typically follow these steps:
Verifying a Digital Signature:
1. Receive Signed Data: Obtain the signed data, which typically consists of the original data and a digital signature.
2. Access the Public Key: Ensure you have access to the public key of the entity that signed the data. This key is used to verify the digital signature.
3. Compute SHA256 Hash: Calculate the SHA256 hash of the original data. This hash serves as a unique identifier for the data.
4. Verify Signature: Use the public key to decrypt the digital signature, obtaining a decrypted hash value.
5. Compare Hash Values:Compare the decrypted hash value with the SHA256 hash computed from the original data.