Siemens SINAUT MD741-1 System Manual page 139

Network A
Computer
IP address
Network mask 255.255.255.0
Network B
Computer
IP address
Network mask 255.255.255.0
Network C
Computer
IP address
Network mask 255.255.255.0
Asymmetrical
encryption
SINAUT MD741-1
C79000-G8976-C236-05
A1 A2
192.168.11.3 192.168.11.4
255.255.255.0
B1 B2
192.168.15.3 192.168.15.4
255.255.255.0
C1 C2
192.168.27.3 192.168.27.4
255.255.255.0
In asymmetrical encryption, data are encrypted with one key and
decrypted with a second key. Both keys are suitable for encryption and
decryption. One of the keys is kept secret by its owner (Private Key),
the other is issued to the public (Public Key), i.e. possible
communication partners.
A message encrypted with a Public Key can only be decrypted and
read by the recipient who has the corresponding Private Key. A
message encrypted with the Private Key can be decrypted by any
recipient who has the corresponding Public Key. Encryption with the
Private Key shows that the message actually originates from the owner
of the corresponding Public Key. We therefore speak of a digital
signature.
Asymmetrical encryption methods such as RSA are, however, slow
and vulnerable to certain attacks, which is why they are often
combined with a symmetrical method ( symmetrical encryption). On
the other hand, concepts are also possible which avoid the complex
administration of symmetrical keys.
A3 A4
192.168.11.5 192.168.11.6 192.168.11.7
255.255.255.0 255.255.255.0
B3 B4
192.168.15.5 192.168.15.6
255.255.255.0 255.255.255.0
C3 C4
192.168.27.5 192.168.27.6
255.255.255.0 255.255.255.0
Glossary
A5
255.255.255.0
Additional
internal
routes:
Network:
192.168.15.0/24
Gateway:
192.168.11.2
Network:
192.168.27.0/24
Gateway:
192.168.11.2
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