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Encryption is a means of protecting data by encoding it in such a way that the casual observer can t view it without a password/passphrase or a special file known as a cryptographic key (normally abbreviated to key). Encryption is used for privacy purposes and also to verify the identity of the person who originated a file or an e-mail message. Two types of encryption are normally utilized on home computers and offered by Ubuntu: File encryption: Files can be encrypted so that they require a secret passphrase to be decrypted. Alternatively, you can encrypt files so that they can be decrypted only by a particular individual. E-mail encryption: E-mail messages can either be encrypted, so that only the recipient will be able to read them, or authenticated via a cryptographically generated signature, so that the recipient can be sure the e-mail genuinely originated from you and not a third party. Ubuntu s e-mail program, Evolution, supports the digital signing of e-mail, as well as full encryption of e-mail sent to others or decryption of e-mail sent to you. The Nautilus file manager can also be used to encrypt files for personal use or so that only a particular individual will be able to decrypt them.
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CHAPTER 9 HOW TO SEC URE Y OUR COMPUTE R
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Note Although Evolution supports encryption, you don t have to use it. Indeed, many Ubuntu users don t
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utilize public key encryption, although power users often go this route. And, in general, relatively few people use e-mail encryption.
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Underpinning Ubuntu s encryption system is a public key encryption system. Two keys are generated by an individual: the private key and the public key. The private key is kept private by the individual who generated it, while the public key is passed around to anyone who wants it (or even published on Internet databases). The two keys are related in that one key can encrypt data so that only the corresponding key can decrypt it. For example, you could encrypt a file or e-mail message intended for Jane using her public key, and only Jane would be able to decrypt it using her private key. However, and crucially, you would not be able to subsequently decrypt the file, even though you had encrypted it in the first place data encrypted with a public key cannot then be decrypted with that same public key. Only the private key can decrypt it. If Jane wanted to encrypt a file so that only you could decrypt it, she would need to use your public key. You would then use your private key to decrypt it. No one else would be able to decrypt it once it was encrypted. When utilized in an e-mail program, public key encryption works in two ways. When sending a message to you, anyone can use your public key to encrypt a message (and any attached files) so that only you can read it. This ensures confidentiality. In the same way, you can encrypt a message sent to others using their public key, so that only they can read it. Alternatively, and more commonly, a digital signature can be added to an e-mail file, even though the e-mail itself is sent unencrypted. This signature is generated from your private key along with the body of the message, and it is decrypted at the other end using your public key, therefore proving the e-mail could have come only from you. This is known as signing an e-mail message, because it is as if you personally signed it in your own handwriting, thereby vouching for its authenticity. The e-mail is sent in plain text in case the recipient doesn t use public key encryption.
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