You can protect data from undetected changes by including a proof of identity value called a digital signature.
A digital signature relies on hashing and public key cryptography. When you sign data, you hash the data and encrypt the results with your private key. The encrypted hash value is called a digital signature.
If you change the original data, a different digital signature will be generated.
To use a PKA key to sign a file, write a program.
Verifying a digital signature is the opposite of signing data. Verifying a signature will tell you if the signed data has changed or not. When a digital signature is verified, the signature is decrypted using the public key to produce the original hash value. The data that was signed is hashed. If the two hash values match, then the signature has been verified. To do this, write a program.
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