How secure is a partial 64bit hash of a SHA1 160bit hash?



So http://en.wikipedia.org/wiki/SHA-1 SHA-1 produces a 160-bit (20-byte) hash valueand As of 2012, the most efficient attack against SHA-1 is considered to be the one by Marc Stevens with an estimated cost of $2.77M to break a single hash value by renting CPU power from cloud serversWith a theoretical attack taking 2^60 operationsSo if a custom verification algorithm only the first 64bits of the full hash how secure is that? How many operations would it require?

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Related to : How secure is a partial 64bit hash of a SHA1 160bit hash?


How secure is a partial 64bit hash of a SHA1 160bit hash?
Category : Information Security
So http://en.wikipedia.org/wiki/SHA-1 SHA-1 produces a 160-bit (20-byte) hash valueand As of 2012, the most efficient attack against SHA-1 is considered to be the one by Marc Stevens with an estimated cost of $2.77M to break a single hash value by renting CPU power from cloud serversWith a theore

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(Problem Solved) Hash(m1 xor m2) = Hash(m1) xor Hash (m2) Is this true in case of SHA1
Category : Web Design

Can anyone shed some knowledge on this?


My answer is no, it is not true, because SHA1 has a strong collision resistant property.


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Generating a SHA1 hash in Windows Phone outputs a different hash
Category : Programming Languages

I'm currently using the built-in methods in Windows Phone and Silverlight to create a SHA1 hash of a string. This is the code:


private static string CalculateSHA1(string text)
{
SHA1Managed s = new SHA1Managed();
UTF8Encoding enc = new UTF8Encodin

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HMC SHA1 hash - C# producing different hash output than PHP
Category : C & C++ & C#

I have a code in PHP and that is below when i Execute the Below PHP code and when i Run the C# code which is below PHP Code i got different Result I dont know where I am wrong.


$accessID = "member-1681fca809";
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A .Net Trick Everyday! (subject of today: SHA1 - Secure Hash Algorithm Class)
Category : Development
Dear Member,
Today, the hot.Net members received both C# and VB.NET code with subject
"158# SHA1 (Secure Hash Algorithm) class for the passwords and the others".
If you didnt receive it, this means you are not a hot.Net member.
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In Ruby, why is Hash[:a, 1] and Hash[[[:a, 1]]] giving the same result {:a => 1}, while Hash[[:a,1]] gives an empty hash?
Category : Programming Languages
> Hash[:a,2,:b,4]
=> {:a=>2, :b=>4}
> Hash[:a,1]
=> {:a=>1}
> Hash[[:a,1]]
=> {}
> Hash[[[:a,1]]]
=> {:a=>1}

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Is it possible to convert a 40-character SHA1 hash to a 20-character SHA1 hash?
Category : Programming Languages

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:


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PHP secure logon script - md5 hash is not matching the hash i wrote to the database in a previous script?
Category : Databases

I am trying to cobble together a login script in PHP as a learning project.


This is the code for my database write when the user registers. Both of these values are written to the database.


$this->salt = md5(uniqid());
$this->password = md5($password.$salt)

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Why when adding a hash to a hash, Ruby seems to nest the added hash?
Category : Programming Languages

I'm trying to create a two-dimensional hash like the following:


permissions['enrollment'] = ['read' => true, 'create' => true, 'update' => true]
permissions['invoices'] = ['read' => true, 'create' => false, 'update' => false]

This is what


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MD5 Hash Compare C# Created Hash to SQL 2005 Create Hash
Category : ASP & ASP.net

HI All,

 I have an issue which is most likely a lack of knowledge on my part,

I have a situation which requires me to compare a hash (MD5) generated in an ASP.Net application against a text value (the pre-hashed value) in SQL 2005.

The hash comes from a cookie and w


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