Is there a reason this thread is going to the list? I am subscribed to securityfocus, but have never seen threads like this come through? Just wondering before I email them.
-----Original Message-----
From: listbounce (at) securityfocus (dot) com [email concealed] [mailto:listbounce (at) securityfocus (dot) com [email concealed]] On Behalf Of David Howe
Sent: Wednesday, August 19, 2009 9:47 AM
To: pen-test (at) securityfocus (dot) com [email concealed]
Cc: M.D.Mufambisi; crypto (at) securityfocus (dot) com [email concealed]
Subject: Re: Cryptographic Functions
M.D.Mufambisi wrote:
> Hello people.
>
> 1. When a passphrase is used a key in symetric cryptography, how does
> the pass phrase map to the key in an algorithm like AES? ie....how
> many letters correspond to 1 bit? etc?
That is undefined. AES uses a key of fixed size (ok, you can choose the
key size, but within those constraints) but how you get from an ascii
string to a binary key is not part of the definition. In most cases
though, its a simple hash, or minor variation thereof.
ANS Group plc
Synergy House
Manchester Science Park
Manchester
M15 6SY
www.ansgroup.co.uk
The information contained in this communication from david.howe (at) ansgroup.co (dot) uk [email concealed] is confidential and may be legally privileged.
It is intended solely for use by crypto (at) securityfocus (dot) com [email concealed] and others authorized to receive it.
If you are not crypto (at) securityfocus (dot) com [email concealed] you are hereby notified that any disclosure, copying, distribution or taking action
in reliance of the contents of this information is strictly prohibited and may be unlawful.
ANS Group plc 2009 - Privacy Policy - Registered Office is Synergy House, Manchester Science Park, Manchester, M15 6SY. Reg No. 3176761. (Registered in England & Wales)
-----Original Message-----
From: listbounce (at) securityfocus (dot) com [email concealed] [mailto:listbounce (at) securityfocus (dot) com [email concealed]] On Behalf Of David Howe
Sent: Wednesday, August 19, 2009 9:47 AM
To: pen-test (at) securityfocus (dot) com [email concealed]
Cc: M.D.Mufambisi; crypto (at) securityfocus (dot) com [email concealed]
Subject: Re: Cryptographic Functions
M.D.Mufambisi wrote:
> Hello people.
>
> 1. When a passphrase is used a key in symetric cryptography, how does
> the pass phrase map to the key in an algorithm like AES? ie....how
> many letters correspond to 1 bit? etc?
That is undefined. AES uses a key of fixed size (ok, you can choose the
key size, but within those constraints) but how you get from an ascii
string to a binary key is not part of the definition. In most cases
though, its a simple hash, or minor variation thereof.
David Howe
Senior Support Consultant
david.howe (at) ansgroup.co (dot) uk [email concealed]
Office Number: 0161 227 1010
DDI:
Mobile:
Fax: 0161 227 1020
ANS Group plc
Synergy House
Manchester Science Park
Manchester
M15 6SY
www.ansgroup.co.uk
The information contained in this communication from david.howe (at) ansgroup.co (dot) uk [email concealed] is confidential and may be legally privileged.
It is intended solely for use by crypto (at) securityfocus (dot) com [email concealed] and others authorized to receive it.
If you are not crypto (at) securityfocus (dot) com [email concealed] you are hereby notified that any disclosure, copying, distribution or taking action
in reliance of the contents of this information is strictly prohibited and may be unlawful.
ANS Group plc 2009 - Privacy Policy - Registered Office is Synergy House, Manchester Science Park, Manchester, M15 6SY. Reg No. 3176761. (Registered in England & Wales)
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