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Hour 8. Email Security > Using Digital Signatures

Using Digital Signatures

When email is signed with a digital signature, it provides a level of proof that the person using the email address sent the message. More importantly, it also ensures that no one tampered with the message.

A digital signature is a digital code that can be attached to an email message to uniquely identify the sender. Like a written signature, the purpose of a digital signature is to guarantee that the individual sending the message really is who he claims to be. To be effective, we need to be assured that a digital signature is not forged, and there are a number of different encryption techniques that guarantee this level of security.

Encryption is a more secure form of a digital signature, and encodes the message so that only someone with the sender's secret key or password can read the message. Encrypted data is also referred to as cipher text.



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