Cryptoprotect utility "4K-Crypt" is simple program for encryption/decryption of any files. It is intended for zipping and providing confidentiality of stored or transmitted information. It uses library for encryption and digital signature according to ISO-8730 standard. After installing the program, "4K-Crypt" menu will be available from MS Windows explorer context menu. As a key for encryption of data, the program uses an 8-digit numeric code.