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

 Sigtryggur HOME ยป 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 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?

 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? by Sigtryggur in 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 TAGS: secure partial 64bit hash SHA1 160bit (Problem Solved) Hash(m1 xor m2) = Hash(m1) xor Hash (m2) Is this true in case of SHA1 by swinaz in Information Security Can anyone shed some knowledge on this? My answer is no, it is not true, because SHA1 has a strong collision resistant property. TAGS: Problem Solved Hash Hash Hash this Generating a SHA1 hash in Windows Phone outputs a different hash by Scott Smith in Information Security 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 TAGS: Generating SHA1 hash Windows Phone outputs A .Net Trick Everyday! (subject of today: SHA1 - Secure Hash Algorithm Class) by dfuze in Information Security 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."HotDotNet" is a Yahoo group whi TAGS: Trick Everyday subject today SHA1 Secure HMC SHA1 hash - C# producing different hash output than PHP by SystemOverclock in Information Security 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";\$secretKey = "63f22236ab43b69462b3272b110e3c78";\$expires = 13 TAGS: SHA1 hash producing different hash output Is it possible to convert a 40-character SHA1 hash to a 20-character SHA1 hash? by undeinpirat in Information Security 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: TAGS: possible convert character SHA1 hash character 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? by Dannar26 in Information Security > Hash[:a,2,:b,4] => {:a=>2, :b=>4} > Hash[:a,1] => {:a=>1} > Hash[[:a,1]] => {} > Hash[[[:a,1]]] => {:a=>1} TAGS: Ruby Hash Hash giving same result PHP secure logon script - md5 hash is not matching the hash i wrote to the database in a previous script? by Thomas in Information Security 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) TAGS: secure logon script hash matching hash Why when adding a hash to a hash, Ruby seems to nest the added hash? by OutOfBrain in Information Security 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 TAGS: when adding hash hash Ruby seems How do i un-SHA1 hash something.. by Ferzerp in Information Security hey, i'm using CryptoSys API for encryption, and i got a program to successfully encrypt using the SHA1 algorithm....but how do i un-SHA1 the information? lolthanks TAGS: SHA1 hash something

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