I want the algorithm for cisco type 7 encryption and decryption. On searching, I found out that it uses Vigenere cipher encryption but it won't work. Please anybody help me out. If I found some small lead then also it will be good.
Thank You.
The algorithm is published in a Global Information Assurance Certification (GIAC) Paper titled "Cisco IOS type 7 password vulnerability." SANS Submission date September 24, 2000. https://www.giac.org/paper/gcih/84/cisco-ios-type-7-password-vulnerability/100566
There is an even better description of the algorithm in the PassLib documentation page titled "Cisco “Type 7” hash." https://passlib.readthedocs.io/en/stable/lib/passlib.hash.cisco_type7.html
The "Type-7" algorithm is an XOR cipher with a hard-coded key-string which is shifted by an offset referred to as the "salt." My interpretation after writing code that performs this Type-7 decoding, it is NOT a Vigenère cipher.