This lab will teach you how to configure the password encryption service, use a level on Cisco router or switch 7 encryption encrypts the plaintext password.
But it's very easy to use this encryption service is to prevent peak Tom from looking at your shoulder check plaintext passwords configuration is displayed on the screen.
Online posting configuration to delete the type 7 passwords are encrypted when you share, you can easily crack the password. Type 5 password using the MD5 hash value, is a one-way (non-reversible) 128-bit algorithm. This password cannot be "decrypted" due to the nature of the algorithm. When you authenticate the MD5 format password Cisco device, and match it to the machine encrypt your password string strings are stored in the configuration. If there is a match then authentication was successful, if not then authentication is not your password is rejected.
Head type 7 passwords are regarded as weak, and type 5 password is "uncrackable" PE se.
Type 5 password hashes cannot be decrypted with a rainbow table password hash values of type 5 is divided into 3 separate sections. Using the types found in the laboratory this laboratory 5 password hashes, $1 Cisco type 5 password, $ID2R means "salt" and $2AKUK4US6yUQVkggSMkLV0 is "salt" calculate MD5 hash value. Cisco does not publish "salt" technically how to use MD5 hashing so it is "unknown".
Salt is used to ensure that they are unique and exclusive to the salts functions to write MD5 strings in the extra security. For example, let us say the actual password after using the phrase, prehashed the password value in the second character of the randomly generated password is Hello123, and Cisco parts of salt than "his" $SALT "under llo123 will give you a unique MD5 strings. Ultimately I am tryign to point is that Cisco using salt features of these technologies are proprietary. Keep in head in the salt is random generated of and and password hash storage in together, makes it almost impossible, even created for each current value of standard MD5 Rainbow table of Rainbow, because you not knows in the "salt" how using you of function cannot prepared a feet was set on each may of password as salt random generated of each using Shi of Rainbow table in the found of Cisco equipment Shang of password "secret xxxx enabled" command.
So when someone tells you that you can crack Type5 rainbow tables is not correct because the standard rainbow tables will not work, because a standard rainbow tables do not have every possible MD5 hashes of salted passwords hashed Cisco IOS can generate value.
Step 1. Configure the user account to use the local user name Tom and Cisco's secret
R1 con0 is now available
Press RETURN to get started.
R1>enable
R1#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
R1(config)#username tom secret Cisco
Step 2. Configure a user account to use the local user name John and password Cisco;
R1(config)#username john password Cisco
Step 3. Tom and John--verify that the user account was created by viewing the running configuration. Tip: you can view the user name in the configuration of the round using a regular expression, as follows;
R1(config)#do show run | inc username
username tom privilege 15 secret 5 $1$ID2R$2AKUK4US6yUQVkggSMkLV0
username john privilege 15 password 0 Cisco
R1(config)#
Step 4. In global configuration mode by performing the service password-encryption see below; enable password encryption service
R1(config)#service password-encryption
Step 5. Verify, after John's user name is encrypted by viewing the user name in the configuration of the round is shown below; enable password encryption service
R1(config)#do show run | inc username
username tom privilege 15 secret 5 $1$ID2R$2AKUK4US6yUQVkggSMkLV0
username john privilege 15 password 7 106D000A0618
R1(config)#
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