How Secure Is the Military-Grade AES Encryption Algorithm?

The BitLocker encryption algorithm is used when BitLocker is first enabled, and sets the strength to which full volume encryption should occur. Available encryption algorithms are: AES-CBC 128-bit, AES-CBC 256-bit, XTS-AES 128-bit, or XTS-AES 256-bit encryption. The default value is XTS-AES 128-bit encryption. Why most people use 256 bit encryption instead of 128 bit? AES comes with three standard key sizes (128, 192 and 256 bits). Many people see this and think that if there are three distinct sizes instead of just one, then there must be some difference, and since the 256-bit version is a bit slower than the 128-bit version (by about 40%), it must be "more secure". AES Example - Input (128 bit key and message) AES Example - Round 1, Substitution Bytes current State Matrix is 0 B B @ 00 3C6E 47 1F 4E 22 74 0E 08 1B 31 54 59 0B1A 1 C C A substitute each entry (byte) of current state matrix by corresponding entry in AES S-Box for instance: byte 6E is substituted by entry of S-Box in row 6 and column E, i.e., by 9F this leads to new State Matrix 0 B B TKIP vs AES: Wi-Fi Security Protocols Explained | Beebom Sep 30, 2017

## 128-Bit SSL Encryption Vs 256-Bit SSL Encryption

The AES encryption algorithm encrypts and decrypts data in blocks of 128 bits. It can do this using 128-bit, 192-bit, or 256-bit keys. AES using 128-bit keys is often referred to as AES-128, and so on. The following diagram provides a simplified overview of the AES process… Hence, AES treats the 128 bits of a plaintext block as 16 bytes. These 16 bytes are arranged in four columns and four rows for processing as a matrix − Unlike DES, the number of rounds in AES is variable and depends on the length of the key. AES uses 10 rounds for 128-bit keys, 12 rounds for 192-bit keys and 14 rounds for 256-bit keys.

### AES128_ECB_PKCS5Padding. AES_Encrypt/Decrypt.c C 实现的 AES128 加解密接口. AES_Cipher.h/.cpp C++ 实现的 封装良好的 AES128 加解密接口

aes gcm - Why GCM operation mode with AES-128 is AES can be used with 128,192, and 256-bit key sizes and always with 128-bit block size †.. In NIST 800-38d, GCM is defined for 128-bit block size, since it is operating on block size and doesn't mandate about the key size.. This Recommendation specifies an algorithm called Galois/Counter Mode (GCM) for authenticated encryption with associated data. How to Make BitLocker Use 256-bit AES Encryption Instead Jul 28, 2014 Solved: Is AES-256-CBC the same as AES-256-SHA? - Cisco