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A hacker intercepts and replays a digitally signed financial transaction to t...

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A hacker intercepts and

replays

a digitally signed financial transaction

to transfer funds multiple times,

even though the signature is valid.

Which best practice

would

prevent this?

a) Encrypting the digital

signature before sending it

b) Using

time-stamped nonces to prevent signature reuse

c) Using a

longer hash function (e.g., SHA-512 instead of SHA-256)

d) Storing all signatures in a public database to detect duplicates

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