rainbowtable | 易学教程

Why is it called rainbow table?

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问题 Anyone know why it is called rainbow table? Just remembered we have learned there is an attack called "dictionary attack". Why it is not call dictionary? 回答1: Because it contains the entire "spectrum" of possibilities. A dictionary attack is a bruteforce technique of just trying possibilities. Like this (python pseudo code) mypassworddict = dict() for password in mypassworddict: trypassword(password) However, a rainbow table works differently, because it's for inverting hashes. A high level

What is a dictionary attack?

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问题 When we say dictionary attack, we don't really mean a real dictionary, do we? My guess is we mean a hacker's dictionary i.e. rainbow tables, right? My point is we're not talking about someone keying different passwords into the login box, we're talking about someone who has full access to your database (which has hashed passwords, not plain passwords) and this person is reversing the hashes, right? 回答1: Since passwords are oft-times the easiest-to-attack part of cryptography it's actually

rainbow table?

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Anyone know why it is called rainbow table? Just remembered we have learned there is an attack called "dictionary attack". Why it is not call dictionary? Because it contains the entire "spectrum" of possibilities. A dictionary attack is a bruteforce technique of just trying possibilities. Like this (python pseudo code) mypassworddict = dict() for password in mypassworddict: trypassword(password) However, a rainbow table works differently, because it's for inverting hashes. A high level overview of a hash is that it has a number of bins: bin1, bin2, bin3, bin4, bin5, ... Which correspond to

RAR passwords, why don't rainbow tables work? [closed]

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问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 24 days ago . I've been looking around for encryption and I've seen several implementations of Rainbow Tables work like charm on passwords (say windows). I'm yet to see an implementation of a Rainbow attack on a RAR file. Why is it so. What makes RAR encryption more secure and immune to these sorts of attacks? 回答1: A rainbow

Rainbow tables as a solution to large prime factoring

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问题 In explanations I've read about public key cryptography, it is said that some large number is come up with by multiplying together 2 extremely large primes. Since factoring the product of large primes is almost impossibly time-consuming, you have security. This seems like a problem that could be trivially solved with rainbow tables. If you know the approximate size of primes used and know there are 2 of them, you could quickly construct a rainbow table. It'd be a mighty large table, but it

Rainbow tables as a solution to large prime factoring

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In explanations I've read about public key cryptography, it is said that some large number is come up with by multiplying together 2 extremely large primes. Since factoring the product of large primes is almost impossibly time-consuming, you have security. This seems like a problem that could be trivially solved with rainbow tables. If you know the approximate size of primes used and know there are 2 of them, you could quickly construct a rainbow table. It'd be a mighty large table, but it could be done and the task could be parallelized across hardware. Why are rainbow tables not an effective

is there a way to reverse a hash without rainbow tables? [duplicate]

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问题 This question already has answers here : Closed 8 years ago . Possible Duplicate: md5 decoding. How they do it? this page suggests that a hash algorithm like md5() and sha1() can be reversed because of the huge processing power that we have nowadays. At this point i tought it was only possible with Rainbow Tables. Was i wrong? In case Rainbow Tables is the only way to go, how someone could reverse a hash that was made with a salt? 回答1: Well, this question in general is a duplicate of This

How does password salt help against a rainbow table attack?

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问题 I\'m having some trouble understanding the purpose of a salt to a password. It\'s my understanding that the primary use is to hamper a rainbow table attack. However, the methods I\'ve seen to implement this don\'t seem to really make the problem harder. I\'ve seen many tutorials suggesting that the salt be used as the following: $hash = md5($salt.$password) The reasoning being that the hash now maps not to the original password, but a combination of the password and the salt. But say $salt

Salt Generation and open source software

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问题 As I understand it, the best practice for generating salts is to use some cryptic formula (or even magic constant) stored in your source code. I\'m working on a project that we plan on releasing as open source, but the problem is that with the source comes the secret formula for generating salts, and therefore the ability to run rainbow table attacks on our site. I figure that lots of people have contemplated this problem before me, and I\'m wondering what the best practice is. It seems to me