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I encrypt a contract with my private key and send you the encrypted file. You successfully...

I encrypt a contract with my private key and send you the encrypted file. You successfully decrypt it with my corresponding public key, which we assume is correct and publically available to all. Also assume that my private key is not known by anybody other than me.

a. only you can read the contract

b. you can be certain that the contract came from me

c. the contract may have been modified by a bad-guy who modified the encrypted text

d. the contract can be trusted if and only if nobody other than you knows your private key

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Answer #1

This is asymmetric encryption.

I encrypt a contract with my private key and send you the encrypted file. You successfully decrypt it with my corresponding public key.

Then you can be certain that the contract came from me.

Option b

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