derived key

You only want to use derived keys.

The derived key is used instead of the original key or password as the key to the system.

Therefore, if a derived key is compromised, future and past transaction data are still protected since the next or prior keys cannot be determined easily.

The encryption is done with a derived key, which is not re-used after the transaction.

Once the vector is generated, the elements of it are accessed in a pseudo-random order, and combined to produce the derived key.

The use of salt prevents the attackers from precomputing a dictionary of derived keys.

The standard does not mandate any particular method of key derivation, although it does generally mandate that derived keys be different from each other.

It replaces an earlier standard, PBKDF1, which could only produce derived keys up to 160 bits long.

Each hLen-bit block T of derived key DK, is computed as follows:

A KDF may also be used to ensure that derived keys have other desirable properties, such as avoiding "weak keys" in some specific encryption systems.

Such use may prevent an attacker who obtains a derived key from learning useful information about either the input secret value or any of the other derived keys.

We propose using a double encryption process, by combining the derived key with hardware based key (stored or derived from a hardware device, like Hardware Tokens or even a Machine Identifier).

The protection process should hide the key somewhere in the PE file, or it can use the key as a Derived Key from some parts of the PE file using any key derivation algorithms.

Such use may be expressed as where is the derived key, is the key derivation function, is the original key or password, is a random number which acts as cryptographic salt, and refers to the number of iterations of a sub-function.

PBKDF2 applies a pseudorandom function, such as a cryptographic hash, cipher, or HMAC to the input password or passphrase along with a salt value and repeats the process many times to produce a derived key, which can then be used as a cryptographic key in subsequent operations.