Xceed Encryption Library lets Windows apps encrypt/decrypt data using latest industry standard strong encryption algorithms. Supports traditional secret-key encryption & public-key encryption, and can encrypt/decrypt memory buffers, strings, blobs, streaming data or files. Supports AES (US Advanced Encryption Standard) symmetric encryption algorithm (Rijndael) and Twofish, the runner-up for AES. Also offers RSA algorithm with unlimited key sizes.
Free download