Articles Tagged ‘encryption’

Snippet: Creating secure Password Hashes in Java with Heimdall

Sunday, July 12th, 2015

These days where a cheap GPU for about 100 € is capable to create 3 billion of MD5 Hashes per second, we need not only need to use salts the right way but we also need to choose a strong, non-reversible and slow hashing schemes when storing passwords in our application.

Heimdall is a library that implements a secure and upgradable password hashing mechanism and uses at the time of writing this article PBKDF2 SHA-1 HMAC with 20000 iterations and a 192 bit (24 byte) salt per default.

In the following short examples I’d like to demonstrate how to create password hashes, how to verify passwords and how to check if a password hash needs to be recreated using a more secure algorithm.