Python - Why ever use SHA1 when SHA512 is more secure?

Posted by orokusaki on Stack Overflow See other posts from Stack Overflow or by orokusaki
Published on 2010-04-14T19:55:54Z Indexed on 2010/04/14 20:03 UTC
Read the original article Hit count: 172

Filed under:

sha1

|

hash

|

sha512

I don't mean for this to be a debate, but I'm trying to understand the technical rationale behind why so many apps use SHA1, when SHA512 is more secure. Perhaps it's simply for backwards compatibility.

Besides the obvious larger size (128 chars vs 40), or slight speed differences, is there any other reason why folks use the former?

Also, SHA-1 I believe was first cracked by a VCR's processor years ago. Has anyone cracked 512 yet (perhaps with a leaf blower), or is it still safe to use without salting?

© Stack Overflow or respective owner

Related posts about sha1

PBKDF2-HMAC-SHA1

as seen on Stack Overflow - Search for 'Stack Overflow'
To generate a valid pairwise master key for a WPA2 network a router uses the PBKDF2-HMAC-SHA1 algorithm. I understand that the sha1 function is performed 4096 times to derive the PMK, however I have two questions about the process. Excuse the pseudo code. 1) How is the input to the first instance… >>> More
Is it possible to get identical SHA1 hash?

as seen on Stack Overflow - Search for 'Stack Overflow'
Given two different strings S1 and S2 (S1 != S2) is it possible that: SHA1(S1) == SHA1(S2) is True? If yes - with what probability? Is there a upper bound on the length of a string, for which probably of getting duplicates is 0? If not - why not? Thanks >>> More
Is it possible to convert a 40-character SHA1 hash to a 20-character SHA1 hash?

as seen on Stack Overflow - Search for 'Stack Overflow'
My problem is a bit hairy, and I may be asking the wrong questions, so please bear with me... I have a legacy MySQL database which stores the user passwords & salts for a membership system. Both of these values have been hashed using the Ruby framework - roughly like this: hashedsalt = … >>> More
Is there any difference between md5 and sha1 in this situation?

as seen on Stack Overflow - Search for 'Stack Overflow'
It is known that 1. if ( md5(a) == md5(b) ) 2. then ( md5(a.z) == md5(b.z) ) 3. but ( md5(z.a) != md5(z.b) ) where the dots concatenate the strings. What happens in the second row if we change all the md5 to sha1? So: 1. if ( sha1(c) == sha1(d) ) 2. then ( sha1(c.z)… >>> More
iPhone: convert string using HMAC-SHA1

as seen on Stack Overflow - Search for 'Stack Overflow'
hi all, i want to generate HMAC-SHA1 of NSString type variable. I see the post but this method give me error in CCHmac(kCCHmacAlgSHA256, cKey, strlen(cKey), cData, strlen(cData), cHMAC); and NSString *hash = [HMAC base64Encoding]; line. Please suggest how can I generate the HMAC-SHA1 of any string… >>> More

Related posts about hash

Problem with hash function: hash(1) == hash(1.0)

as seen on Stack Overflow - Search for 'Stack Overflow'
I have an instance of dict with ints, floats, strings as keys, but the problem is when there are a as int and b as float, and float(a) == b, then their hash values are the same, and thats what I do NOT want to get because I need unique hash vales for this cases in order to get corresponding values… >>> More
Hash table vs Hash list vs Hash tree?

as seen on Stack Overflow - Search for 'Stack Overflow'
What property makes Hash table, Hash list and Hash tree different from each other? Which one is used when? When is table superior than tree. >>> More
Constructing a hash table/hash function.

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, I would like to construct a hash table that looks up keys in sequences (strings) of bytes ranging from 1 to 15 bytes. I would like to store an integer value, so I imagine an array for hashing would suffice. I'm having difficulty conceptualizing how to construct a hash function such that given… >>> More
Hash of unique value = unique hash?

as seen on Stack Overflow - Search for 'Stack Overflow'
Theoretically does hashing a unique value yield a unique value? Let's say I have a DB table with 2 columns: id and code. id is an auto-incrementing int and code is a varchar. If I do ... $code = sha1($id); ... and then store $code into the same row as $id. Will my code column be unique as well… >>> More
EMERGENCY - Major Problems After Perl Module Installed via WHM

as seen on Stack Overflow - Search for 'Stack Overflow'
I attempted to install the perl module Net::Twitter::Role::API::Lists using WHM and after doing so my whole site came down. It seems that something that was updated with the install isn't functioning correctly and since our website it written in Perl none of our site scripts will run. In almost 8… >>> More