php - Why have a different salt for every password? -

-

this question has answer here:

adding long salt prevents attacker use rainbow table attack. add, example, fve4qrwgfagvwrvfedsgfgbvseasionvwegsf32 passwords before hashing, he's not going have rainbow table these words.

so, why use different salt every password? reason see attacker create rainbow table once default salt, , use rainbow table then. it?


Comments

Post a Comment

Popular posts from this blog

mongodb - Struggling to get ordered results from the last retrieved article, given array of elements to search in -

-
i have collections of objects structure this: { "_id" : objectid("5233a700bc7b9f31580a9de0"), "id" : "3df7ce4cc2586c37607a8266093617da", "published_at" : isodate("2013-09-13t23:59:59z"), ... "topic_id" : [ 284, 9741 ], ... "date" : numberlong("1379116800055") } i'm trying use following query: db.collection.find({"topic_id": { $in: [ 9723, 9953, 9558, 9982, 9833, 301, ... 9356, 9990, 9497, 9724] }, "date": { $gte: 1378944001000, $lte: 1378954799000 }, "_id": { $gt: objectid('523104ddbc7b9f023700193c') }}).sort({ "_id": 1 }).limit(1000) the above query uses topic_id, date index not keep order of returned results. forcing use hint({_id:1}) makes results ordered, nscanned 1 million documents though limit(1000) specified. what missing?
Read more

c# - Pausing a storyboard on TabItem mouse over -

-
i have tab control invisible tabs. when mouse on area of form, calls c# handler runs: ((storyboard)findresource("animate")).begin(hiddentab); the animate storyboard: <storyboard x:key="animate"> <objectanimationusingkeyframes begintime="0:0:0" storyboard.targetproperty="visibility"> <discreteobjectkeyframe keytime="0"> <discreteobjectkeyframe.value> <visibility>visible</visibility> </discreteobjectkeyframe.value> </discreteobjectkeyframe> </objectanimationusingkeyframes> <doubleanimation begintime="0:0:0.0" storyboard.targetproperty="opacity" from="0" to="1" duration="0:0:0.2"/> <doubleanimation begintime="0:0:2.5" storyboard.targetproperty="opacity" from="1" to="0...
Read more

c# - Attribute value in root node of xml Linq to XML -

-
while parsing xml linq xml, came across strange behaviour (atleast me). below first xml parsed `<?xml version="1.0" encoding="utf-8"?> <testrun> <unittestresult testname = "arun" outcome = "i"> </unittestresult> <unittestresult testname = "arun1" outcome = "i"> </unittestresult> </testrun>` my code looks xdocument doc = xdocument.parse(filecontents); var result = doc.descendants("unittestresult"); the above works fine. if root node contain attributes same code not working. reason. xml sample below <?xml version="1.0" encoding="utf-8"?> <testrun id="7903b4ff-8706-4379-b9e8-567034b70abb" name="inaambika@inbelw013312a 2016-02-26 16:55:14" runuser="stc\inaambika" xmlns="http://microsoft.com/schemas/visualstudio/teamtest/2010"> <unittestresult testname = "arun" outcome = "...
Read more