Best way to transfer csv or excel file ??

Hi
Can anyone recommend the best way for a customer emailing a csv or excel file to me - how can i guarantee it came from them and hasn't been tampered with. This file is generated from the application i develped if this helps.
Have looked at public private keys and signatures etc,
Thx
Stephen

1. your customer should have generated a key pair (public/private).
2. you should have a copy of his public key.
3. the customer creates a hash (using MD5 for example) from the file he wants to send.
4. the customer encrypts the resulting hash with his secret key (this is a signature).
5. the customer sends the file and the encrypted hash.
After you receive both files:
1. you create a hash from the excel file received (using the same algorithm the customer used to create the hash).
2. you decrypt the encrypted hash the customer sent.
3. you compare both hashes, if both are the same, then the excel file you received is Ok = has not been tampered.
Hope this helps.

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Best way to transfer csv or excel file ??

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