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keys to encrypt the data; only the other half of the pair can decrypt the data. Of vital importance is that you can t share the private half of the key pair. Only the public key can be shared; in fact, it can be widely distributed to others. It is an absolute tenet of public-key cryptography that each subject keeps their private key con dential, never sharing it with anyone. You can choose to use either key to encrypt, but only the matching key from the pair will decrypt. In gure A.2, Alice uses the recipient s public key to encrypt her plaintext message into ciphertext. Bob uses his private key to decrypt the ciphertext back into the original plaintext message. If you want to make sure only the recipient can read your message, use that person s public key to encrypt, and then they and only they using their private key can decrypt. This is encryption to send a secret message to only the intended recipient. If you want everyone who gets your message to know it came from you and only you, use your private key to encrypt; then, the recipients can use your public key to decrypt. This is using a digital signature to prove that you and only you could have sent the message. Whichever way asymmetric encryption is used, it s limited to relatively small messages. A frequent pattern is to use asymmetric encryption to encrypt and exchange a shared key but then to use shared-key encryption for large messages that are being exchanged. The ubiquitous and highly successful SSL technology uses this pattern for virtually all web sites doing secure transactions: it uses asymmetric encryption for the initial authentication and to exchange a shared secret key; then, using the shared key, all the data transmitted across the SSL channel is encrypted using a symmetric algorithm.
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Bob s public key Alice
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Figure A.2 The public-key (asymmetric) encryption process. Alice uses Bob s public key to encrypt plaintext into ciphertext using an asymmetric (public-key cryptography) algorithm. Bob uses his private key from the same key pair to decrypt the ciphertext into the original plaintext. This message is completely unreadable by anyone without Bob s private key.
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APPENDIX
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For web services and cloud computing (which is based on and uses web services), digital signatures and encryption are typically applied to XML streams of data (or used inside SOAP envelopes). The standards formed for this purpose are called, not surprisingly, XML Signature and XML Encryption.
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XML Signature
XML Signature is a foundational technology for web services security in general and its use in cloud computing security. XML Signature is built on top of mature digital signature technology. The purpose of digital signatures is to provide a mechanism for message integrity (no one has changed the message since it was created) and nonrepudiation (you can t refute this message exchange). XML Signature was created to encode digital signatures into XML. Congress approved electronic signatures in June 2000. This approval gave legitimacy to electronic signatures. It prevents the contesting of a signed contract solely because it is signed electronically. This event set the stage for digital signature standards. XML Signature came out of an IETF/W3C working group called XML-DSig that was established to create a highly extensible signature syntax tightly integrated with existing XML technologies, but one that could also handle composite documents from diverse application domains as well.
XML Encryption
Similar to XML Signature, XML Encryption is built on top of mature cryptographic technology in this case, shared-key encryption technology. Core requirements for XML Encryption are that it must be able to encrypt an arbitrarily sized XML message, and it must do so ef ciently. Those two factors led its creators to choose shared-key (symmetric) encryption as the foundation for XML Encryption (remember, sharedkey encryption can handle arbitrary-sized messages, whereas asymmetric key encryption is limited to small messages). Encryption provides for message con dentiality (the message is secret from all but the intended recipient). You need XML Encryption over and above transport-level encryption, such as SSL, because you want to control message-level security at the application level and not leave it to the underlying infrastructure (which you don t control) to provide it. With XML Encryption, you can maintain con dentiality of messages in the face of the message taking multiple hops on its way to its destination, which can compromise end-to-end security. At SSL termination points, you lose control of the security of your data. This is common when you use shared services. You also need con dentiality when storing the XML message, even after it reaches its nal destination. This requirement is called persistent con dentiality. Like XML Signature, XML Encryption applies standard algorithms to data and then stores that encrypted result in XML. And as with XML Signature, you can apply encryption selectively to portions of a document.
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