Encryption Fundamentals


Cryptography provides confidentiality through encryption, which is the process of disguising a message to hide its original content.

With encryption, plain text (the readable message) is converted into ciphertext (the unreadable, disguised message); decryption at the destination reverses this process. Figure 10-18 illustrates this process.

Figure 10-18 Encryption Protects Data Confidentiality

Math is fun!

Math is fun!

M Encrypt (Lock)


Secret Key

Data Confidentiality

Decrypt (Unlock)


The purpose of encryption is to guarantee confidentiality; only authorized entities can encrypt and decrypt data. With most modern algorithms, successful encryption and decryption require knowledge of the appropriate cryptographic keys. A sample use of data encryption is when the IPsec encryption algorithm is used to hide the payload of IP packets.

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Project Management Made Easy

Project Management Made Easy

What you need to know about… Project Management Made Easy! Project management consists of more than just a large building project and can encompass small projects as well. No matter what the size of your project, you need to have some sort of project management. How you manage your project has everything to do with its outcome.

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