Excellent Utilities: AES Crypt - file encryption tool
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AES Crypt is file encryption software that uses the industry standard Advanced Encryption Standard (AES) to easily and securely encrypt files.
AES (also known as Rijindael) is a symmetric encryption algorithm. The algorithm was designed to be efficient in both hardware and software, and supports a block length of 128 bits and key lengths of 128, 192, and 256 bits.