HP Jetdirect 610n HP Jetdirect Print Servers - HP Jetdirect and SSL/TLS - Page 13

Symmetric Cryptography

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User Unencrypted Message Encryption Performed Message Delivery Decryption Performed User Unencrypted Message Figure 15 - Symmetric Cryptography In Figure 15, the confidentiality provided to the message is done via a single key. Because the same key is used for encryption and decryption, this process is known as symmetric cryptography. Symmetric cryptography commonly has two attributes associated with it: • It performs well - it is fast and easy to implement • It has a key distribution problem - how do you get the symmetric key to everyone that needs it in a secure way? Asymmetric cryptography is also available and functions very different than symmetric cryptography. It has two keys - one Public and one Private. The private key is not shared with anyone. The Public key is like a public telephone number. You can share it with everyone. Let's look at Figure 16 - Asymmetric Cryptography. 13

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13
Message Delivery
User
Encryption Performed
User
Decryption Performed
Unencrypted Message
Unencrypted Message
Figure 15 - Symmetric Cryptography
In Figure 15, the confidentiality provided to the message is done via a single key.
Because the same
key is used for encryption and decryption, this process is known as symmetric cryptography.
Symmetric cryptography commonly has two attributes associated with it:
•
It performs well – it is fast and easy to implement
•
It has a key distribution problem – how do you get the symmetric key to everyone that needs
it in a secure way?
Asymmetric cryptography is also available and functions very different than symmetric cryptography.
It has two keys – one Public and one Private.
The private key is not shared with anyone. The Public
key is like a public telephone number.
You can share it with everyone.
Let’s look at Figure 16 –
Asymmetric Cryptography.