hi friends does one-way hashing algorithms have key ( like symmetric encryption keys ? ) ? or they only hash encrypt data via no key ?

Hash functions can be used both with and without keys to either generate a message digest when used without a key or to generate a message authentication code and are called keyed hash functions when used with a key. /Hasain

Hash functions can be used both with and without keys to either generate a message digest when used without a key or to generate a message authentication code and are called keyed hash functions when used with a key. /Hasain hi Hasain and thank you. when at win 7 client , user enters his domain username and password , which of the hash algorithms does client use to generate hash of the password ? ( which one : md5 , sha1, sha2,....) does in this case , hash function uses a key ? what is that key ? how the client and DC, both know the key ?

Windows stores password using LM Hash and or NT Hash. LM Hash is generated using: 1) Force the password to be 14 characters. This means dropping any characters over 14, or padding the password with "null" bytes to a length of 14. 2) Convert the password to uppercase. 3) Break the 14 character password into 2 7-character chunks. 4) Use each of the 7 character chunks as a key to encrypt the constant string KGS!@#$% using DES. 5) Concatenate the two results together to create the LM Hash. NT Hash is created using:. 1) Convert the password to Unicode (using Little Endian). 2) Compute the MD4 hash of the Unicode text. /Hasain

Windows stores password using LM Hash and or NT Hash. LM Hash is generated using: 1) Force the password to be 14 characters. This means dropping any characters over 14, or padding the password with "null" bytes to a length of 14. 2) Convert the password to uppercase. 3) Break the 14 character password into 2 7-character chunks. 4) Use each of the 7 character chunks as a key to encrypt the constant string KGS!@#$% using DES. 5) Concatenate the two results together to create the LM Hash. NT Hash is created using:. 1) Convert the password to Unicode (using Little Endian). 2) Compute the MD4 hash of the Unicode text. /Hasain thank you veryyyyy much dear Hasain