Some of the features of AES4VB are: Performs 256-bit AES encryption and decryption. Includes cryptographically secure pseudo random number generator. Does key generation from password phrases. Encrypts and decrypt files, strings, and byte data. Supports PKCS7 padding. Supports initialization vectors. Supports CBC (Cipher Block Chaining) mode. Supports ECB (Electronic Cookbook) mode. Supports SHA-256 cryptographic hash algorithm. Does random byte data generation. Allows concurrent encryption/decryption threads. Validated using "known answer tests" published by the National Institute of Standards and Technology. Includes multiple Visual Basic example programs. Does not depend on support libraries (calls to core Windows API functions only). Royalty free distribution with your compiled application. C source code is available.