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Re: HTTPS data in a form

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Arno Welzel wrote:

> "If I have a form where there's a username and a password, and I'd like
> only the *password* to be encrypted before being sent [...]"

OK, then the correct answer is that it is foolish to want that because the 
used encryption/hashing algorithm would have to reside on the client in the 
form of a client-side script *for every attacker plain to see* (obfuscation 
is _not_ protection).

Where passwords are involved, the form data – password *and* username –, 
SHOULD¹ be sent via an encrypted *connection* (HTTPS or, IOW, HTTP over a 
TLS-1.2-encrypted TCP connection; minimum cipher strength should be 256 
bits).  The password SHOULD NOT be stored on the server at all (and maybe 
not even the username verbatim), but only its checksum (“hash”) *that is 
computed by the server and SHOULD never leave the server*.  (Computing a 
hash is _not_ encryption.)

Checking a username/password then means comparing the hash of the provided 
username/password against the stored hash(es) *server-side*.  The hash 
should be computed using a strong hashing algorithm (so _not_ plain MD5 or 
SHA1, but rather the likes of bcrypt [default for password_hash() since PHP 
5.5.0] and scrypt with a strong salt [using the default for password_hash() 
is recommended as of PHP 7.0.0 as the “salt” option was deprecated]).

See also:

<https://www.owasp.org/index.php/Authentication_Cheat_Sheet> pp.
<https://www.owasp.org/index.php/Password_Storage_Cheat_Sheet> pp.
<http://php.net/password_hash>

However, it is equally possible that the OP has a basic misconception about 
“password encryption”.  Hiding a password, e.g. by masking characters (e.g. 
using the HTML type="password" attribute), is _not_ “password encryption” 
either.

_________
¹  see RFC 2119 for the definitions of all-uppercase requirement levels
-- 
PointedEars
Zend Certified PHP Engineer 
<http://www.zend.com/en/yellow-pages/ZEND024953> | Twitter: @PointedEars2
Please do not cc me. / Bitte keine Kopien per E-Mail.

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Thread

HTTPS data in a form bit-naughty@hotmail.com - 2016-09-15 21:45 -0700
  Re: HTTPS data in a form "J.O. Aho" <user@example.net> - 2016-09-16 07:52 +0200
  Re: HTTPS data in a form Arno Welzel <usenet@arnowelzel.de> - 2016-09-17 15:57 +0200
    Re: HTTPS data in a form Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2016-09-17 21:17 +0200
      Re: HTTPS data in a form Jerry Stuckle <jstucklex@attglobal.net> - 2016-09-17 17:02 -0400
        Re: HTTPS data in a form "Peter H. Coffin" <hellsop@ninehells.com> - 2016-09-21 11:33 -0500
          Re: HTTPS data in a form Jerry Stuckle <jstucklex@attglobal.net> - 2016-09-23 08:47 -0400
          Re: HTTPS data in a form Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2016-09-24 22:11 +0200
      Re: HTTPS data in a form Arno Welzel <usenet@arnowelzel.de> - 2016-09-19 21:36 +0200
        Re: HTTPS data in a form Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2016-09-19 23:28 +0200
          Re: HTTPS data in a form "Christoph M. Becker" <cmbecker69@arcor.de> - 2016-09-19 23:44 +0200
            Re: HTTPS data in a form Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2016-09-19 23:57 +0200
              Re: HTTPS data in a form "Christoph M. Becker" <cmbecker69@arcor.de> - 2016-09-20 19:00 +0200
          Re: HTTPS data in a form Jerry Stuckle <jstucklex@attglobal.net> - 2016-09-19 21:00 -0400
          Re: HTTPS data in a form Stefan+Usenet@Froehlich.Priv.at (Stefan Froehlich) - 2016-09-20 05:59 +0000
            Re: HTTPS data in a form Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2016-09-20 15:40 +0200
              Re: HTTPS data in a form "J.O. Aho" <user@example.net> - 2016-09-20 18:39 +0200
                Re: HTTPS data in a form Jerry Stuckle <jstucklex@attglobal.net> - 2016-09-20 14:36 -0400
              Re: HTTPS data in a form Stefan+Usenet@Froehlich.Priv.at (Stefan Froehlich) - 2016-09-20 21:04 +0000
                Re: HTTPS data in a form Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2016-09-24 21:58 +0200
                Re: HTTPS data in a form Arno Welzel <usenet@arnowelzel.de> - 2016-09-26 19:43 +0200
              Re: HTTPS data in a form Arno Welzel <usenet@arnowelzel.de> - 2016-09-23 09:14 +0200
                Re: HTTPS data in a form Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2016-09-24 22:00 +0200
                Re: HTTPS data in a form Arno Welzel <usenet@arnowelzel.de> - 2016-09-26 19:44 +0200
          Re: HTTPS data in a form Arno Welzel <usenet@arnowelzel.de> - 2016-09-20 08:20 +0200
            Re: HTTPS data in a form Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2016-09-20 15:41 +0200
              Re: HTTPS data in a form Arno Welzel <usenet@arnowelzel.de> - 2016-09-23 09:02 +0200
                Re: HTTPS data in a form Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2016-09-24 22:06 +0200
                Re: HTTPS data in a form Arno Welzel <usenet@arnowelzel.de> - 2016-09-26 19:49 +0200
  Re: HTTPS data in a form Richard Damon <Richard@Damon-Family.org> - 2016-09-18 14:22 -0400
    Re: HTTPS data in a form Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2016-09-19 23:36 +0200
      Re: HTTPS data in a form Jerry Stuckle <jstucklex@attglobal.net> - 2016-09-19 21:03 -0400
  Re: HTTPS data in a form "Peter H. Coffin" <hellsop@ninehells.com> - 2016-09-21 11:29 -0500

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