Ssh Key Pairs - Siemens RUGGEDCOM ROS User Manual

Chapter 1
Introduction
Section 1.2.2.2

SSH Key Pairs

Controlled versions of ROS support SSH public/private key pairs that conform to the following specifications:
• PEM format
• DSA key pair, 512 to 2048 bits in length
The DSA key pair used in the default key pair and in those generated by ROS uses a public key of 1024 bits in
length.
NOTE
DSA keys smaller than 1024 bits in length are not recommended, and support is only included here for
compatibility with legacy equipment.
NOTE
DSA key generation times increase depending on the key length. 1024 bit RSA keys may take several
minutes to generate, whereas 2048 bit keys may take significantly longer. A typical modern PC system,
however, can generate these keys in seconds.
The following (bash) shell script fragment uses the ssh-keygen command line utility to generate a 1024 bit DSA
key suitable for use in ROS . The resulting ssh.keys file, which may then be uploaded to ROS:
# DSA key size:
BITS=1024
# Make an SSH key pair:
ssh-keygen -t dsa -b 1024 -N '' -f ssh.keys
The following is an example of an SSH key generated by ROS:
Private-Key: (1024 bit)
priv:
00:b2:d3:9d:fa:56:99:a5:7a:ba:1e:91:c5:e1:35:
77:85:e8:c5:28:36
pub:
6f:f3:9e:af:e6:d6:fd:51:51:b9:fa:d5:f9:0a:b7:
ef:fc:d7:7c:14:59:52:48:52:a6:55:65:b7:cb:38:
2e:84:76:a3:83:62:d0:83:c5:14:b2:6d:7f:cc:f4:
b0:61:0d:12:6d:0f:5a:38:02:67:a4:b7:36:1d:49:
0a:d2:58:e2:ff:4a:0a:54:8e:f2:f4:c3:1c:e0:1f:
9b:1a:ee:16:e0:e9:eb:c8:fe:e8:16:99:e9:61:81:
ed:e4:f2:58:fb:3b:cb:c3:f5:9a:fa:ed:cd:39:51:
47:90:5d:6d:1b:27:d5:04:c5:de:57:7e:a7:a3:03:
e8:fb:0a:d5:32:89:40:12
P:
00:f4:81:c1:9b:5f:1f:eb:ac:43:2e:db:dd:77:51:
6e:1c:62:8d:4e:95:c6:e7:b9:4c:fb:39:9c:9d:da:
60:4b:0f:1f:c6:61:b0:fc:5f:94:e7:45:c3:2b:68:
9d:11:ba:e1:8a:f9:c8:6a:40:95:b9:93:7c:d0:99:
96:bf:05:2e:aa:f5:4e:f0:63:02:00:c7:c2:52:c7:
1a:70:7c:f7:e5:fe:dd:3d:57:02:86:ae:d4:89:20:
ca:4b:46:80:ea:de:a1:30:11:5c:91:e2:40:d4:a3:
82:c5:40:3b:25:8e:d8:b2:85:cc:f5:9f:a9:1d:ea:
0a:ac:77:95:ee:d6:f7:61:e3
Q:
00:d5:db:48:18:bd:ec:69:99:eb:ff:5f:e1:40:af:
20:80:6d:5c:b1:23
G:
01:f9:a1:91:c0:82:12:74:49:8a:d5:13:88:21:3e:
32:ea:f1:74:55:2b:de:61:6c:fd:dd:f5:e1:c5:03:
68:b4:ad:40:48:58:62:6c:79:75:b1:5d:42:e6:a9:
6
RUGGEDCOM ROS
User Guide
SSH Key Pairs