有关电子商务的一篇文章，哪位朋友帮忙翻译下！！比较急！！原文如下！
Most ecommerce merchants leave the mechanics to their hosting company or IT staff, but it helps to understand the basic principles. Any system has to meet four requirements:
privacy: information must be kept from unauthorized parties.
integrity: message must not be altered or tampered with.
authentication: sender and recipient must prove their identities to each other.
non-repudiation: proof is needed that the message was indeed received.
Privacy is handled by encryption. In PKI (public key infrastructure) a message is encrypted by a public key, and decrypted by a private key. The public key is widely distributed, but only the recipient has the private key. For authentication (proving the identity of the sender, since only the sender has the particular key) the encrypted message is encrypted again, but this time with a private key. Such procedures form the basis of RSA (used by banks and governments) and PGP (Pretty Good Privacy, used to encrypt emails).
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