What one-way hash function to use?

Posted by Jonas Elfström Tue, 27 Feb 2007 16:01:00 GMT

Cryptographic hash function takes a message of any length as input and outputs a very large but fixed length number. That number is called a message digest, fingerprint, or sometimes a cryptographic hash. They can be used to represent passwords without having to know the actual password. Such a hash can also be used as signature that makes it possible to verify that the content of a message hasn't been tampered with.

MD5 got into problems over 10 years ago and SHA-1 could to be heading the same way. Until the new standard is published I would follow the cryptographic experts advice and use SHA-2.

require 'digest/sha2'
quickfox="The quick brown fox jumps over the lazy dog"
=> "d7a8fbb307d7809469ca9abcb0082e4f8d5651e46d3cdb762d02d0bf37c9e592"
using System.Security.Cryptography;


 ASCIIEncoding byteConverter = new ASCIIEncoding();
 string quickfox="The quick brown fox jumps over the lazy dog";
 HashAlgorithm sha256 = new SHA256Managed();
 byte[] hash = sha256.ComputeHash(byteConverter.GetBytes(quickfox));
 crypt.Text = Convert.ToBase64String(hash);           

Posted in Security, Ruby, C# | no comments


Comments are closed