It would be great if anyone could point me at any examples. Thank you, AES-128 (XTS-AES-128) — iOS 12 demo. iPhone 6s, iPhone 6 plus with iOS 12 (11B143). What is AES-256? Oct 22, 2023 — AES-256: AES is the most basic symmetric encryption algorithm. It's a variation on standard symmetric encryption. You can use AES to encrypt data (a word for example, a document or file) with a key length of eight bits. AES can use any algorithm to encrypt data. So, all you need to do is pass the key to your AES cipher. A key is what protects the encryption. It is used to encrypt and decrypt the data. A word for example will be considered as one message with four parts: an initial key, the ciphertext, a cipher-block chaining (CBC) operation and the decryption key. Using the key you only have to encrypt a single message. You need to encrypt multiple messages, so the key has to be used for each message. The AES is implemented in software, in an application called the CTR mode. As described in  . Decryption Key Encryption Key (16 byte) Encryption Type (16 byte) Encryption Length (8 byte) Plaintext (16 byte) Text Encryption (16 byte) AES 256-bit AES 128 AES 192 AES 128 Plaintext (Encrypted) Ciphertext (Encrypted) cipher-block chaining (CBC) Decryption Key (Encrypted) This is all about AES-256. It is a popular algorithm nowadays and all modern systems and apps are implemented in it, especially in encryption algorithms for storing confidential data such as credit card details/personal data etc. Many modern apps even have built-in encryption (including iOS and Android), so AES-256 is often preferred to other algorithms. All AES-256 encryption algorithms are backward compatible. This means that an app implemented in previous versions of the iOS or Android software will work as well as an upgraded version. This is very important if you plan to use a previous version or your password to login on a system or software. So, that concludes our brief review of AES. Next, we will be doing a “cryptanalysis” on this algorithm, which will also be of much use to the cybersecurity field.