Protect a Password Database with a One-way Hash A one-way hash function is a cryptographicalgorithm that turns an arbitrary-length input into a fixed-length binary value,and this transformation is one-way, that is,given a hash value it is statistically infeasible tore-create a document that would produce this value.There are three widely used hash algorithms: MD4, MD5, and SHA. MD4 and MD5 produce 128-bit hashes, and SHA a 160-bit hash.Computing Hash Using AspEncrypt With AspEncrypt, a hash function is computed in three steps:Dictionary Attacks and Salt Even a hash-encrypted password database is not entirely secure. A hackercan compile a list of, say, 1,000,000 most commonly usedpasswords and compute a hash function from all of them. He can then get hold of your user account database and compare the hashed passwords in the database withhis own list to see what matches. This is a "Dictionary Attack"and it can be very successful.Sample User Database The sample MS Access database shipped with the product contains the tableUsers which has three fields: Username, Password and Salt. The following ASP code(also found in the file Samples\Passwords\AddUser.asp of the installation)allows you to add a user account to the Users table. Salt is calculatedby concatenating together 10 random characters between 'A' and 'Z'. |
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Encrypt Your Password Database with a One-way Hash (2024)
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