- HOW TO RESET KEEPASS MASTER PASSWORD ZIP FILE
- HOW TO RESET KEEPASS MASTER PASSWORD FULL
- HOW TO RESET KEEPASS MASTER PASSWORD PASSWORD
- HOW TO RESET KEEPASS MASTER PASSWORD PC
- HOW TO RESET KEEPASS MASTER PASSWORD ZIP
HOW TO RESET KEEPASS MASTER PASSWORD PASSWORD
That is what the app needs to pass to the hash library to check if a provided password is correct or not.
HOW TO RESET KEEPASS MASTER PASSWORD FULL
Why? Because the smallest unit the individual developer needs to operate on is that full string. But from a security practice, this makes perfect sense. I know this might seem a bit unintuitive for people coming from a database background, where the modus operandi is to normalize data and using serialized strings is considered an ugly hack.
HOW TO RESET KEEPASS MASTER PASSWORD ZIP
Zip encryption of any kind does not provide integrity, but you specified that you only need confidentiality. Assuming you want a minimum of 128 bits of security and are choosing a password from a set of 62 symbols (an alphanumeric password), you would want to use at least 22 characters, as log2(6222) ≈ 131 bits and, obviously, 131 ≥ 128. If you switch to the newer Zip encryption format which supports AES, then you can securely encrypt files and trust that they will stay confidential indefinitely. In fact, it took only a few hours on a personal computer, and that was with 90s hardware! Attacks only get better over time, and the attack against ZipCrypto is no exception to this trend: An Improved Known Plaintext Attack on PKZIP Encryption Algorithm. With 13 bytes of known plaintext, the full key can be recovered with a complexity of 238, which is not much. The attack, discovered in the 90s, is detailed in A Known Plaintext Attack on the PKZIP Stream Cipher. This can typically be satisfied by using the header of a file, which is typically known for the vast majority of commonly compressed files.
HOW TO RESET KEEPASS MASTER PASSWORD ZIP FILE
It is highly vulnerable to a known-plaintext attack, which in practice does not require knowing exactly what your Zip file contains, only a minuscule portion. ZipCrypto is extremely weak, as it is based internally on a non-cryptographic construction called a CRC. You are using the ZipCrypto cipher, rather than the more secure AES. If you are using ZipCrypto for encryption, then any password length is insecure. So I would not use a password that is included in the HIBP database, simply for the reason that those passwords have a higher chance to be included in wordlists. So the chance that someone checks a hash against this password is a lot higher than the chance of him or her checking a hash against an unknown password, even if it has been used somewhere. And to make things worse, this subset is used in wordlists by a lot of people around the world to check if they have been reused. The passwords are now not just any passwords that have been used, but a very small subset of them. If the breached passwords were thereafter publicly disclosed, they are now available on the internet. The conclusion however, is not right: The important question is not if a password has ever been used, but if the password has ever been included in a breach.
This would have to be stored somewhere in close proximity to the processor to be read with the same speed as the processor calculates the hashes. A password list with 243 passwords with an average password length of 8 characters would be about 64 TB in size, if my calculation is correct. So I'll leave it be.Īlso, in practice it is easier-and might be faster-to check for any random character password with a fixed length than to check unique passwords from a list.
One could refine and complicate it as much as desired, but it doesn't really add to the point. Also, the number of iterations is configurable (6000 is only the default value). In "custom password derivation process", the "custom" is a scary word. This assumes that the password derivation process is not flawed in some way.
HOW TO RESET KEEPASS MASTER PASSWORD PC
But with two PC that's only 25 million years. You're in for 10 20*0.5/32000 seconds, also known as 50 million years. With ten random characters chosen uniformly among the hundred-of-so of characters which can be typed on a keyboard, there are 10 20 potential passwords, and brute force will, on average, try half of them. With a quad-core recent PC (those with the spiffy AES instructions), you should be able to test about 32000 potential passwords per second. The default number of iterations is 6000, so that's 12000 AES invocations for processing one password (encryption is done on a 256-bit value, AES uses 128-bit blocks, so there must be two AES invocations at least for each round). KeePass uses a custom password derivation process which includes multiple iterations of symmetric encryption with a random key (which then serves as salt), as explained there.
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