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- Router B receives Router A's digitally signed update and strips the digital signature from it.
- Router B decrypts the digital signature by using Router A's public key.
- Router B inputs the routing table update into the one-way hash algorithm, resulting in message digest B.
- Router B compares message digest A to message digest B.
If they match, B has authenticated that the information came from router A, and can update the tables. If they do not match, the routing tables will not be updated.
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