11/12/2022 0 Comments Decrypt cisco secret 4![]() ![]() ![]() Using the Type 5 password hash found in the lab instruction of this lab, $1 represents the Cisco type 5 password, the $ID2R which represents the “salt” and $2AKUK4US6yUQVkggSMkLV0 is the actual MD5 hash that is calculated with the “salt”. Type 5 password hashes cannot be decrypted with rainbow tables due to the fact the Type 5 password hash is divided into 3 separate sections. Keep in mind type 7 passwords are considered weak whereas type 5 passwords are “uncrackable” pe se. If it matches then the authentication is successful, if not then authentication is not and your password is declined. When you authenticate to a Cisco device that stores the password in MD5 format, the device encrypts the password string you provided and matches it to the string stored in configuration. This password cannot be “decrypted” due to the nature of the algorithm. Type 5 passwords use a MD5 hash which is a one-way (non-reversible) 128bit algorithm. When posting configurations online to share be sure to remove the type 7 encrypted passwords as these passwords can be easily cracked. There is however a good use for this encryption service which is to prevent peaking tom’s from looking over your shoulder while you have a configuration displayed on screen from viewing clear text passwords. This lab you will teach you how to configure the password encryption service to encrypt clear text passwords using to level 7 encryption on a Cisco Router and/or Switch. An example website being this website here. There are many websites that offer a decryption applet to allow you to copy and paste a service password encrypted hash and decrypt the hash for you to clear text. Level 7 encryption on a Cisco device by today’s cryptographic standards is considered extremely weak. ![]()
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