Although still less then perfect, they allow you to use passwords relatively securely.
These strengthen the password using salt and a work factor (or iteration count for PBKDF2). This is why password based key derivation functions such as bcrypt or PBKDF2 are being used. In general, people don't use those kind of passwords. You could either use a 44 character base 64 string or 64 character hex string as well - at least those would be easy to decode/encode to/from bytes. Even you would create such a password, you'd have trouble encoding it over the required number of bits. To create a key you'd need about 37 fully random characters to create an AES key of 256 bit strength. Suppose you use 128 characters out of an alphabet (this is a large alphabet). And if we use a comma somewhere, uppercase letter, or use a word from a different language it gets much safer. This mean that "singing retracted eleventh elephant" is an equivalent of a 12 character password, and also it's much easier to remember. If we use only lowercase letters in our four word passphrase, the dictionary hack has to do in the worst case $1000000^$ searches. There are over a milion words in the English language. They are vulnerable to dictionary hacking, but if you use enough words a dictionary hack also takes years to complete. But I strongly suggest using a passphrase instead of a password. 9 characters is the absolute minimum (if there is at least one uppercase letter, one lowercase letter, one number and one symbol). About the security of the password you already answered yourself. You need to derive a key from a password. Just for you to know you shouldn't use password as a key directly. It's much simpler to use rubber-hose cryptanalysis in this case.
256 BIT ENCRYPTION PASSWORD GENERATOR CRACK
If I wanted to crack 256 bits long key and 128 bit long IV on my work laptop, I would probably be around a fifth of way done when the universe would collapse. It's much better to use a long and complicated password that he has to read from a post-it-note glued to your monitor, and derive the key and IV from it.Īs for security, let me put it this way. I suggest not using a truly random key and IV, because you have to save them somewhere, and adversary can just read it from your hard drive. You can generate them using the command I found here: openssl enc -aes-256-cbc -k secret -P -md sha1 You chose to use the 256 bit algorithm that operates in CBC mode.
0 kommentar(er)
