Abstract: Data security is provided using an encryption/decryption algorithm which attaches at the primitive BIOS level of the operating system automatically during the power-on self-test routines. The encryption/decryption process is implemented by intercepting the removable media or floppy diskette interrupt in order to add additionasl interrupt ahandling routing instructions which perform the encryption and decryption of data passed between the diskette controller and the data transfer buffer area within system RAM. Bitwise alteratio of the data in a predefined relationship is used to encrypt and decrypt. The encryption/decryption system sttaches before the computer power-up sequence renders data entry hardware active, hence the user cannot readily override the secrity system. Data stored on nonremovable media such as hard disk media is not encrypted, thereby preserving the integrity of more permanent data.

Abstract: Data security is provided using an encryption/decryption algorithm which attaches at the primitive BIOS level of the operating system automatically during the power-on self-test routines. The encryption/decryption process is implemented by intercepting the removable media or floppy diskette interrupt in order to add additional interrupt handling routing instructions which perform the encryption and decryption of data passed between the diskette controller and the data transfer buffer area within system RAM. Bitwise alteration of the data in a predefined relationship is used to encrypt and decrypt. The encryption/decryption system attaches before the computer power-up sequence renders data entry hardward active, hence the user cannot readily override the security system. Data stored on nonremovable media such as hard disk media is not encrypted, thereby preserving the integrity of more permanent data.

Abstract: A dexterity evaluation apparatus which provides an indication of an individual's dexterity by determining the amount of time required for an individual to complete the assembly of a circuit on a simulated electronic circuit board in accordance with an adjoining pre-wired circuit. The apparatus includes a simulated electronic circuit panel, electronic circuit components, a timer circuit, and a timer display. To conduct the dexterity evaluation, the timer display count is started, then the evaluation subject assembles the electronic circuit components on the circuit board. When the assembly is complete, the timer display count is automatically stopped. The completed circuit is then compared for accuracy against the pre-wired circuit and the elapsed time recorded. The results provide an indication of the individual's dexterity for the purpose of monitoring training progress or employment screening.