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● Secure hash algorithm (SHA)
Selection of the Secure Hash Algorithm (SHA)
Range of values:
– SHA-1
– SHA-256
Default setting: SHA-256
● Key wrap algorithm
Selection of the Advanced Encryption Standard (AES)
Range of values:
– AES-128
– AES-256
Default setting: AES-128
● Key length
Specifies the length of the pre-shared key in bytes.
The following lengths are pre-selected depending on the configured key wrap algorithm.
– For AES-128: 16
– For AES-256: 32
● Max. number of statistics queries
If the configured number of statistics queries of the master is exceeded within the key
exchange interval, the RTU enters a message in the diagnostics buffer.
Range of values: 2...255 Default setting: 5
● Authentication requests before key exchange
Maximum number of authentication requests of the RTU with the master. When this
number is reached, the session key is renewed.
Range of values: 1...10000 Default setting: 1000
Recommendation: Set the number for the RTU twice as high as for the master.
● Key exchange interval (min)
Period after which the key is exchanged again between the RTU and the master. The
interval must be matched up on both communications partners.
Range of values: 0...65535 min. at 0 (zero), the key is never changed (function disabled).
Default setting: 15 min.
Recommendation: Set the key exchange interval for the RTU twice as high as for the
master.
RTU3030C
Operating Instructions, 09/2017, C79000-G8976-C382-04
Configuration (WBM)
4.20 Telecontrol
179
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