Ken Thompson, who co-created the popular operating system Unix along with Dennis Ritchie, remains a revered figure in the field of computer science. In 2014, famous open-source developer Leah Neukirchen got her hands on a /etc/password file from a BSD 3 source tree. It contained hashed passwords of some big names like Dennis Ritchie, Steve Bourne, Ken Thompson, Brian W. Kernighan in the computer science field.
Neukirchen tried cracking the passwords out of curiosity as the passwords were sealed with a DES-based crypt(3) algorithm, which is now considered easy to crack.
She was successful in cracking passwords of most of the personalities on the list except five passwords. Out of the uncracked passwords, Neukirchen was most curious about Ken Thompson’s password.
Neukirchen tried combinations of all lower-case letters and digits spending a lot of days but failed to get the password. The topic was raised on The Unix Heritage Society mailing list this month when Neukirchen reminded everyone how frustrated she is about Thompson’s uncracked password.
Posting in the society’s mailing list thread, she wrote: ” never managed to crack ken’s password with the hash ZghOT0eRm4U9s, and I think I enumerated the whole 8 letter lowercase + special symbols key space.”
Ken’s Password – An Absolute Genius
Six days later, a forum member named Nigel Williams achieved the success and wrote “Ken is done” in the forum ..
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