VSEncryptor

VSEncryptor is an easy-to-use encryption program that can encrypt any file or text. The main application window has two panels, one of which is dedicated to typing or pasting text to encrypt and decrypt, the other provides viewing of the results. All you have to do is enter the key that will be needed later for decryption. The program supports keyboard shortcuts for various commands (e.g. file or text swap).

VSEncryptor supports various encryption algorithms, for example:
AES-128, AES-192, AES-256, RC2, RC4, DES, Triple DES, Blowfish, Twofish, Serpent, Camellia, Skipjack, CAST-256, MARS, RC5, RC6, IDEA, SEED, SHACAL-2, XTEA, GOST.

Warning: the program offers third-party applications for download and installation.