Fundamentals of InfoSecintermediate
Arrange the steps of creating and verifying a digital signature in the correct sequential order.
Answer
The sender computes a cryptographic hash of the message., The sender encrypts the hash with their private key to produce the digital signature., The sender transmits both the message and the digital signature to the recipient., The recipient uses the sender's public key to decrypt the signature and verify the hash.
Explanation
### The order
1. **The sender calculates a hash from the document's contents.** The signature process first needs a compact representation of the data.
2. **The sender uses the private key to sign the document's hash.** The signature is created after the hash is calculated.
3. **The sender provides the document and signature to the recipient.** The recipient needs both the data and its signature to perform the check.
4. **The recipient verifies the signature using the corresponding public key.** Verification checks that the signature matches the document and key.
### The concept
The ordering separates creation from verification. The sender creates the signature using the private key; the recipient checks it with the corresponding public key. If the document changes during transfer, verification should fail because the document’s hash changes.
### Terms
- **Hash**: A compact value calculated from data.
- **Private key**: The secret key used to sign.
- **Public key**: The corresponding key used to verify.
- **Verification**: Checking whether a signature is valid for the data and key.
### Remember
Create the content hash before signing, then send the data and signature for verification.
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