SENA STS Series - Manual (Page 56)

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Figure 4-11 Cryptography configuration
4.2.7.2. 3DES Cryptography Method
By setting the cryptography method as 3DES, the STS Series can communicate with other STS Series
device or HelloDevice Pro Series in 3DES(168 bits) encrypted sessions.
Figure 4.12 shows record format of 3DES packet where meanings of each field are as follows,
Length Data Padding
Figure 4-12 Record Format of 3DES packet

Length
The length is 8-bits number. The length is the length of content (data and padding). 3DES is a 64-bit
block cipher algorithm, and then the length must be a multiple of 8(64/8).