Fundamentals of InfoSecintermediate
A valid digital signature proves that a message has never been sent before.
Answer
false
Explanation
### Why this is right
The statement is false because the signature workflow described does not establish that a message is new. Someone could resend an earlier signed message and its signature could still verify.
### The concept
A signature checks the relationship between a document, its hash, and the signer’s key. That can reveal alteration and support evidence of origin, but it does not automatically include a time or freshness check. Systems need additional context or mechanisms to distinguish a new message from a replay.
### The other options
- **True**: This would treat signature validity as proof of freshness. The described signature process does not provide that guarantee.
### Terms
- **Digital signature**: A cryptographic value used to check authenticity and integrity.
- **Replay**: The re-use or re-sending of an earlier message.
- **Freshness**: Evidence that a message is new rather than an earlier transmission.
### Remember
A valid signature can still belong to an old message.
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