Abstract: Method, system and device for generating a signal requesting the execution of deletion of encryption key material in a computer system where the method includes providing a key zeroize activation device (100) attached to the computer system (7) and where the key zeroize activation device (100) provides a zeroizing button (1) mounted within the device (100), and where the zeroizing button (1) generate a request signal when operated.

Abstract: A method and device performing encryption/decryption of data on a mass storage media. A plurality of different encryption/decryption algorithms with associated keys can be utilised on different storage areas of the media, such as blocks/sectors on a hard disk drive, thereby increasing the security of the data significantly. In addition, combining the keys with random numbers for a further increase of the security of the data. The block/sector number is used to select an algorithm with associated key and random number. The device and method encrypts/decrypts emails, networking traffic etc. and other types of electronic data. In addition, the device provides an authentication session when booting a computer from a hard disk drive, and even be used to select a certain operating system and/or environment associated with a certain key carrier by changing the Master Boot Record of the disk system.