Visit that site for details
about how to use that address to test and validate your client-side AUTH setup.
But note the warning on that site: ???Do not use this machine to monitor your
SMTP connectivity. It is for SMTP interpretability testing only!???
This is the Title of the Book, eMatter Edition
Copyright ?© 2007 O??™Reilly & Associates, Inc. All rights reserved.
5.2 Public Key Cryptography | 199
5.2 Public Key Cryptography
Public-key algorithms are asymmetric algorithms based on the use of two different
keys. The two keys are called the private key and the public key:
??? The private key is known only by its owner.
??? The public key is known to everyone (it is public).
What one key encrypts, the other one decrypts, and vice versa. That means that if
someone else encrypts something with your public key (which he knows because it??™s
public), you can use your private key to decrypt the message.
With public key cryptography, the same algorithm is used to decrypt as was used to
encrypt. This simplifies code.
As long as the owner keeps the private key secret, no one but the owner will be able
to decrypt the messages encrypted with the corresponding public key. In public-key
systems, it is relatively easy to compute the public key from the private key, but very
difficult to compute the private key from the public key.
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