SYSKEY

cryptography, operating system, security A utility that

encrpyts the hashed password information in a SAM

database using a 128-bit encryption key.

SYSKEY was an optional feature added in Windows NT 4.0 SP3.

It was meant to protect against offline password cracking

attacks so that the SAM database would still be secure even if

someone had a copy of it. However, in December 1999, a

security team from BindView found

a security hole in SYSKEY which indicates that a certain form

of cryptoanalytic attack is possible offline. A

brute-force attack then appeared to be possible.

Microsoft later collaborated with BindView to issue a fix

(dubbed the 'Syskey Bug') which appears to have been settled

and SYSKEY pronounced secure enough to resist brute-force

attack.

According to Todd Sabin of the BindView team RAZOR, the

pre-RC3 versions of Windows 2000 were also affected.

BindView Security Advisory.

BindView press release.

Microsoft bulletin.

(2000-07-16)