No! Please, please don't do this. Obscurity is no substitute for security. 1) Bcrypt or similar is not 'overkill' no matter who you are. Users reuse passwords, and they're entitled to the best protection you can reasonably provide them. 2) Bcrypt is not there to protect against online attacks, it's there to protect against offline attacks, where an attacker obtains your hashed and salted passwords. 3) Doing "something weird" is security through obscurity. Do not base your security on your attacker not knowing what you did. Really, really don't just concatenate salts to the beginning or end of the password. 4) Both MD5 and SHA1 are merkle-damgard construction hashes ( http://en.wikipedia.org/wiki/Merkle%E2%80%93Damg%C3%A5rd_construction). As a result, the concatenation of several hashes is no more secure than the most secure of the individual hashes.
-Nick Johnson On Sun, Nov 13, 2011 at 2:58 PM, Brandon Wirtz <drak...@digerat.com> wrote: > Unless you are protecting Medical records bcrypt is overkill if you do some > reasonably smart things like "Failed logins from IP >9" > > Or, if you just do something weird to the password BEFORE you SHA it. Like > interleave the user name in the password, Salt1 + UpSaEsRsNwAoMrEd + Salt2 > > Or Pick 2 Hash's SHA(pass) + Md5(pass) > > Don't want to store all that string length? Odd Characters from > Sha(Pass+salt) + Even Characters from MD5(Pass+Salt) > > Uniqueness of the method is more important than the method. > > > > -----Original Message----- > From: google-appengine@googlegroups.com > [mailto:google-appengine@googlegroups.com] On Behalf Of Brian Quinlan > Sent: Saturday, November 12, 2011 6:58 PM > To: google-appengine@googlegroups.com > Subject: Re: [google-appengine] Help resolve massive performance regression > in 2.7 vs 2.5 runtime > > Hi Pol, > > On Sun, Nov 13, 2011 at 1:48 PM, Pol <p...@everpix.net> wrote: > > Hi, > > > > Since switching to 2.7 runtime, logging in to http://www.everpix.com > > went from about a second to anywhere from 15s to 60s. I tracked it > > down to this single password checking line: > > > > from bcrypt import bcrypt > > bcrypt.hashpw(password, self.password_hash) == self.password_hash > > What value are you using for "threadsafe" in your app.yaml? > > How large is self.password_hash? > > Cheers, > Brian > > > This comes from "a native Python implementation of the py-bcrypt > > package from http://www.mindrot.org/projects/py-bcrypt/"; grabbed from > > here: https://github.com/erlichmen/py-bcrypt. > > > > So what's happening here and how can we fix this? > > > > Thanks, > > > > - Pol > > > > -- > > You received this message because you are subscribed to the Google Groups > "Google App Engine" group. > > To post to this group, send email to google-appengine@googlegroups.com. > > To unsubscribe from this group, send email to > google-appengine+unsubscr...@googlegroups.com. > > For more options, visit this group at > http://groups.google.com/group/google-appengine?hl=en. > > > > > > -- > You received this message because you are subscribed to the Google Groups > "Google App Engine" group. > To post to this group, send email to google-appengine@googlegroups.com. > To unsubscribe from this group, send email to > google-appengine+unsubscr...@googlegroups.com. > For more options, visit this group at > http://groups.google.com/group/google-appengine?hl=en. > > > -- > You received this message because you are subscribed to the Google Groups > "Google App Engine" group. > To post to this group, send email to google-appengine@googlegroups.com. > To unsubscribe from this group, send email to > google-appengine+unsubscr...@googlegroups.com. > For more options, visit this group at > http://groups.google.com/group/google-appengine?hl=en. > > -- Nick Johnson, Developer Programs Engineer, App Engine -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To post to this group, send email to google-appengine@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
