Questions tagged [pbkdf]

A PBKDF is a Password Based Key Derivation Function, which can be used to derive key data or derive a "password hash" from a salt and password.

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9
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1answer
3k views

PBKDF vs HKDF for pretty long key

I'm developing a messenger application with encrypted chats. In the first version of the app I've used PBKDF2 (10000 iterations, SHA1, random salt) to extend a short user password and generate keys ...
2
votes
1answer
739 views

Is this key management scheme secure?

I'm designing a scheme for management of a small number of cryptographic keys (< 100 at any given time) and I had an idea: rather than storing all the keys, could I just store one master key and ...
37
votes
1answer
25k views

Password hashing security of argon2 versus bcrypt/PBKDF2?

I wonder if it can be approximated how much of a security margin the new argon2 hash, winner of the password hashing competition, can give over bcrypt or PBKDF2, for an attacker using large GPU ...
6
votes
2answers
336 views

Are there any high level memory-hard PBKDF constructions?

The PBKDF2 construction from PKCS #5 v2 has the convenient feature that it can be implemented using only standard interchangeable cryptographic primitives. Specifically, it only requires the ...
4
votes
2answers
129 views

Key derivation on Arduino

The ATmega2560 is slow - it's a single core, 16MHz 8-bit AVR. Despite that, I need to use some encryption on it, and since it is limited to a few blocks, AES-256 can be used. However, the key ...
3
votes
1answer
404 views

How does ccrypt work?

On many Linux/GNU distributions CCrypt (ccrypt) by Peter Selinger is available as a command line utility to encrypt files. How does the protocol work and is it ...
0
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1answer
256 views

PBKDF2 with the same salt for all IDs

I have a unique identifiers that I would like to keep secure and provide information about it through tokens. These tokens should be verifiable after using the same algorithm on other end system with ...
2
votes
1answer
2k views

Generating passwords using Password-Based Key Derivation Function

I was thinking of using different and independent password for different websites, but not storing them in some password manager so I don't need to backup the passwords. I thought I could use some ...