I think you may be misuderstanding the Public Key advice.

  1. Back at base, you generate a public/private key pair. (Using say; Crypt::RSA.
  2. You give the public key to the laptop users.
  3. Within the script on the laptop, you use that public key to encrypt the numbers and you store the encrypted data in their DBs.

    You discard the numbers immediately.

  4. When they return to base, you can use the private key to decrypt those databases.

Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.
"I'd rather go naked than blow up my ass"

In reply to Re^7: Creating a rainbow table for a ten-digit number: Advice? by BrowserUk
in thread Creating a rainbow table for a ten-digit number: Advice? by willyyam

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