Jul 28, 2014 · Windows’ BitLocker encryption defaults to 128-bit AES encryption, but you can choose to use 256-bit AES encryption instead. Using a 256-bit AES key could potentially offer more security against future attempts to access your files.

Technically, not as stated. AES-256 requires a 256bit key. SHA-512 will output 512 bits so unless you chop off half of the digest it will not work. A better solution is to use a standard and well tested key derivation function such as pbkdf2. Don't roll your own crypto unless absolutely necessary. Use vetted constructions. Advanced Encryption Standard(AES) is a variant of Rijndael which has a fixed block size of 128 bits, and a key size of 128 bits key size, 192-bit key length, or 256-bit encryption. By contrast, Rijndael per se is specified with block and key sizes that may be any multiple of 32 bits, with a minimum of 128 and a maximum of 256-bit encryption No, because there is no such thing as AES-512 bit encryption. There is only AES-128, AES-192 and AES-256 bits encryption specified by NIST in FIPS 197. would most certainly apply to 256-bit as well as 128-bit. (A brief explanation of the terms 128-AES and 256-AES: AES is a symmetric key algorithm. AES encrypts and decrypts data in 128-bit blocks, using 128-, 192- or 256-bit keys. AES nomenclature for the different key sizes is AES-x, where x is the key size.) Sep 09, 2017 · Although 448 bit encryption sounds better – being a bigger number and ‘more secure’, in reality it hasn’t undergone the same testing that AES 256 has been through. Use the industry and time proven standard of AES 256 bit encryption, and don’t risk moving to 448 solely because it sounds better.

## The Advanced Encryption Standard (AES-128bit) is widely used nowadays in many applications. In this paper, we proposed a new variation of AES (AES-512) with 512-bit input block an 512-bit key size compared with 128-bit in the original AES-128 algorithm.

according to the internet, it means "AES-XTS-512 in XTS mode, using two 256-bit keys.". so it is just 256 bit + some snake oil. so it is just 256 bit + some snake oil. permalink

### Let's say you're using a 128-bit AES cipher. The number of possible keys with 128 bits is 2 raised to the power of 128, or 3.4x1038, or 340 undecillion. When it comes to encryption, the rule

AES-512: 512-bit Advanced Encryption Standard algorithm design and evaluation