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 … Read more
Let’s say we have a billion unique images, one megabyte each. We calculate the SHA-256 hash for the contents of each file. The possibility of collision depends on: the number of files the size of the single file How far can we go ignoring this possibility, assuming it is zero? 3 Answers 3
Someone told me that he has seen software systems that: retrieve MD5 encrypted passwords from other systems; decrypt the encrypted passwords and store the passwords in the database of the system using the systems own algorithm. Is that possible? I thought that it wasn’t possible / feasible to decrypt MD5 hashes. I know there are … Read more
I am not able to understand what Range / primary key is here in the docs on Working with Tables and Data in DynamoDB How does it work? What do they mean by “unordered hash index on the hash attribute and a sorted range index on the range attribute”? 4 Answers 4
I have a string that I want to hash. What’s the easiest way to generate the hash in node.js? The hash is for versioning, not security. 13 Answers 13
