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A method of swing on a swing is disclosed, in which a user positioned on a standard swing suspended by two chains from a substantially horizontal tree branch induces side to side motion by pulling alternately on one chain and then the other.
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| Number | Title | Issue Date |
| 4888802 | System and method for providing for secure encryptor key management A system and method for storing encrypter keys in a secure manner to prevent a "debugger" or an unauthorized user of a user application from compromising the keys. A static RAM with a battery support is used to store the keys after they are installed ther... | 12/19/1989 |
| 4888801 | Hierarchical key management system A hierarchical key management system includes a number of secure terminals. These terminals provide secure access to a corresponding number of users. A user inserts a security activation device or key into the secure terminal to access a secure connection... | 12/19/1989 |
| 4853962 | Encryption system A method for encrypting signals utilizes the receiver serial number to generate an index number which is used in turn to select an encryption table from among a plurality of such tables. The index number used in conjuction with any given signal is modifie... | 08/01/1989 |
| 4817140 | Software protection system using a single-key cryptosystem, a hardware-based authorization system and a secure coprocessor The invention provides a software asset protection mechanism which is based on the separation of the software to be protected from the right to execute that software. Protected software can only be executed on composite computing systems in which a physic... | 03/28/1989 |
| 4811393 | Method and system for diversification of a basic key and for authentication of a thus-diversified key The subject of the invention is a method for diversification of a basic key and for authentication of a thus-diversified key as having been fashioned on the basis of a predetermined basic key, and a system for performing the method. An initializing system... | 03/07/1989 |
| 4790012 | Encryption-decryption system In a data encrypting/decrypting system both the encoding and decoding stations are receptive of a common source of time varying digital signals. The digital signals in the encoding station are applied to one or both of circuits for encrypting data supplie... | 12/06/1988 |
| 4771459 | System for storing and distributing keys for cryptographically protected communication In a system for storing and distributing keys for cryptographically protected communication each terminal (Ti) must be provided with keys. If the system comprises many terminals (Ti) each terminal must have a large memory capacity th... | 09/13/1988 |
| 4724541 | Data-dependent binary encoder/decoder Apparatus for the secure transmission of digital data signals is disclosed in which fixed logic gates and a variable bank of logic gates are used in an encoding circuit to scramble the digital data signals with two enciphering words. The resulting scrambl... | 02/09/1988 |
| 4633391 | Extended index for digital information storage and retrieval device In extended for a digital information storage device comprised of a host having the capability of placing Key identifiers in the header of user data blocks to be recorded, a recording device having a random access memory said memory having an Index regist... | 12/30/1986 |
| 4633036 | Method and apparatus for use in public-key data encryption system In an encryption scheme based on the use of a public key having secret factors p and q, additional requirements on p and q are invoked in order to ensure a high level of security. In particular, it is additionally required that a value p+1 have a large pr... | 12/30/1986 |
| 4607137 | Method of distributing and utilizing enciphering keys In a communication network with cryptographically protected connections a unique key is used for each connection between two subscribers, so that when one or more keys fall into the hands of an unauthorized person it has no consequences for the protection... | 08/19/1986 |
| 4605820 | Key management system for on-line communication The subject invention relates to a new and improved key management system particularly suited to facilitate communication between point of sale terminals and a host processor. The system provides for the generation of a table of keys in the terminal. The ... | 08/12/1986 |
| 4578530 | End-to-end encryption system and method of operation An efficient end-to-end encryption system including key management procedures for providing secure, financial data communication between a system user at one of a plurality of transaction terminals of one of a plurality of acquirer institutions and one of... | 03/25/1986 |
| 4555591 | Integrated circuit devices for secure data encryption The present invention relates to apparatus for placing digital words or a private key into a register in an integrated circuit in such a manner that it cannot be later read or modified from outside the integrated circuit for purposes of, for example, prov... | 11/26/1985 |
| 4488001 | Intellectual properties protection device A device for deciphering encoded information is disclosed which comprises logic elements which combine a key input to implement a predetermined set of boolean transformations thereby yielding a corresponding set of translation terms. The translation terms... | 12/11/1984 |
| 4440976 | Automatic selection of decryption key for multiple-key encryption systems A receiver of digitally encoded voice signals that may be encrypted according to a plurality of keep subjects a received signal to decryption according to each of the keys. Decrypted signals are tested for the presence of modulation, and the signal, if an... | 04/03/1984 |
| 4369332 | Key variable generator for an encryption/decryption device An apparatus and method for generating a unique working key variable for controlling the operation of an encryption/decryption device during each user specified time period. The apparatus generates each working key variable by encrypting a user specified ... | 01/18/1983 |
| 4288659 | Method and means for securing the distribution of encoding keys An improved secured data transmission system relies on the favorable comparison of coded signals derived from information about authorized individuals and particular data terminals that is both prestored and subsequently supplied under manual command in o... | 09/08/1981 |
| 4281216 | Key management for encryption/decryption systems In a data encryption/decryption system providing for security of data communications channels, a sub-system for generating, transporting encryption/decryption keys and for introducing those keys into the system while at the same time providing a high leve... | 07/28/1981 |
| 4264782 | Method and apparatus for transaction and identity verification A method and apparatus whereby the senders and receivers of messages sent over a transmission system including a Host CPU may guarantee the integrity of the data content of the message and also the absolute identity of the sender. Each user of the system ... | 04/28/1981 |
| 4262329 | Security system for data processing A data processing security system employs a secure enclosure, such as a vault, for all cryptographic processes, and the maintenance of digital information in storage outside of the enclosure in encrypted form and when not in use by the host computer syste... | 04/14/1981 |
| 4238854 | Cryptographic file security for single domain networks A file security system for data files associated with a host data processing system. The host system includes a data security device which contains a secure host master key and is capable of performing a variety of cryptographic operations. At initializat... | 12/09/1980 |
| 4218738 | Method for authenticating the identity of a user of an information system Secure hardware is provided for cryptographically generating a verification pattern which is a function of a potential computer user's identity number, the potential computer user's separately entered password, and a stored test pattern. The test pattern ... | 08/19/1980 |
| 4145568 | Method and apparatus for ciphering and deciphering messages Method and apparatus for ciphering and deciphering messages, wherein series of cipher pulses with an identical pulse distribution are generated by the transmitter and the receiver stations and said pulse distribution is determined by a secret basic code a... | 03/20/1979 |
