Allied-telesis AT-S60 Instrukcja Użytkownika Pobierz pdf (Strona 345)

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Chapter 20: Encryption

Section III: Security Features 344

digital signature. The signature station publishes its public key, and then

signs its messages by encrypting them with its private key. To verify the

source of a message, the receiver decrypts the messages with the

published public key. If the message that results is valid, then the signing

station is authenticated as the source of the message.

The most common asymmetrical encryption algorithm is RSA. This

algorithm uses mathematical operations which are relatively easy to

calculate in one direction, but which have no known reverse solution.

The security of RSA relies on the difficulty of factoring the modulus of

the RSA key. Because typical key lengths of 512 bits or greater are used

in public key encryption systems, decrypting RSA encrypted messages is

almost impossible using current technology.

Asymmetrical encryption algorithms require enormous computational

resources, making them very slow when compared to symmetrical

algorithms. For this reason they are normally only used on small blocks

of data (for example, exchanging symmetrical algorithm keys), and not

for entire data streams.

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