Top "Cryptographic-hash-function" questions

A cryptographic hash function is a function that takes a string of bytes of variable length and returns a fixed-length digest such that it is extremely difficult to find two inputs that yield the same output or find the original input given an output.

How to hash some string with sha256 in Java?

How can I hash some string with sha256 in Java? Does anybody know of any free library for this?

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How can I hash a password in Java?

I need to hash passwords for storage in a database. How can I do this in Java? I was hoping …

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MD5 is 128 bits but why is it 32 characters?

I read some docs about md5, it said that its 128 bits, but why is it 32 characters? I can't compute the …

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Converting a md5 hash byte array to a string

How can I convert the hashed result, which is a byte array, to a string? byte[] bytePassword = Encoding.UTF8.GetBytes(…

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Which cryptographic hash function should I choose?

The .NET framework ships with 6 different hashing algorithms: MD5: 16 bytes (Time to hash 500MB: 1462 ms) SHA-1: 20 bytes (1644 ms) SHA256: 32 bytes (5618 …

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MD5 Hash and Base64 encoding

If I have a 32 character string (an MD5 hash) and I encode it using Base64, what's the maximun length of …

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How do one-way hash functions work? (Edited)

I read the Wikipedia article about md5 hashes but I still can't understand how a hash can't be "reconstituted" back …

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How come MD5 hash values are not reversible?

One concept I've always wondered about is the use of cryptographic hash functions and values. I understand that these functions …

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How to decrypt a string encrypted with HMACSHA1?

I'm an encryption novice trying to pass some values back and forth between systems. I can encrypt the value, but …

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