Did You Know...
...that the Slinky toy was the result of a failed attempt by engineer Richard James to produce an antivibration device for ship instruments? His goal was to develop a spring that would instantaneously counterbalance the wave motion that rocks a ship at sea. Instead, he developed the Slinky.
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| Number | Title | Issue Date |
| 5490217 | Automatic document handling system A system and method for the filing, retrieving, verifying, translating, exchanging and updating documents by scanning said documents into and storing said documents on a programmed computer system, which system generates or assigns to each document handle... | 02/06/1996 |
| 5479509 | Method for signature of an information processing file, and apparatus for implementing it The invention relates to a method for signature of a primary information processing file (FP), of the type consisting of causing circuits of an information processing device (1, 3, 4) to calculate at least one signature (SG) of the file, by using at least... | 12/26/1995 |
| 5465299 | Electronic document processing system and method of forming digital signature In a terminal which received an electronic document with at leastone digital signature, when a user changes the contents of the received electronic document, a new digital signature is produced by enciphering signature data by using a secret key of the us... | 11/07/1995 |
| 5432852 | Large provably fast and secure digital signature schemes based on secure hash functions The present invention describes new digital signature schemes that are provably secure against any adaptive chosen-message attack. The scheme, which is based on selection of a hash function from a space of such functions, has a very short public key, fast... | 07/11/1995 |
| 5373561 | Method of extending the validity of a cryptographic certificate A cryptographic certificate attesting to the authenticity of original document elements, such as time of creation, content, or source, will lose its value when the cryptographic function underlying the certifying scheme is compromised. The present inventi... | 12/13/1994 |
| 5347581 | Verification process for a communication system The process concerns a system, comprising communication devices A1, A2, . . . A connected to a central verification device B by the means of communication interfaces wherein each device Ai, having data processing means, communication means, memory ... | 09/13/1994 |
| 5231666 | Cryptographic method for updating financial records A data processing system, method and computer program provide for the secure updating an electronic purse which includes a list of purse records. The method includes the step of defining an authentication tree with an authentication tree function comprisi... | 07/27/1993 |
| 5226079 | Non-repudiation in computer networks The invention supplements the use of a conventional authentication token such as a MAC or DSG, to provide very strong evidence of the origin of an electronic message. A new type of authentication token, known as the "Non-Repudiation Vector" (NRV) is attac... | 07/06/1993 |
| 5161189 | Encryption and decryption of chained messages A single sync field (501) and multiple messages or message segments (503, 507, 511, and 515) are chained (407) together and encrypted (407) as a whole. When this encrypted chained message is received, it is decrypted as a whole (605), or in part (613) by ... | 11/03/1992 |
| 5150409 | Device for the identification of messages An apparatus and a method for the identification and encrypting/decrypting of messages permits converting an input message provided as characters, in character-by-character fashion and depending on preceding characters, to form an output message. An addre... | 09/22/1992 |
| 5136646 | Digital document time-stamping with catenate certificate A system for time-stamping a digital document, for example any alphanumeric, video, audio, or pictorial data, protects the secrecy of the document text and provides a tamper-proof time seal establishing an author's claim to the temporal existence of the d... | 08/04/1992 |
| 4991210 | Unpredictable blind signature systems Blind signature systems secure against chosen message attack are disclosed. Multiple candidate original messages can be accommodated. Each of plural candidates in the final signature can be marked by the party issuing the signature in a way that is unmodi... | 02/05/1991 |
| 4933969 | Data authentication and protection system A secure information storage system in which a directory stores identifying titles and pointers to areas of a memory storing respective messages. To protect the messages against unauthorized changes, a MAC (message authentication code) is calculated for t... | 06/12/1990 |
| 4881264 | Digital signature system and method based on a conventional encryption function A method of generating digital signatures for signing an infinitely expandable series of messages Mi. An infinitely expandable tree of signature nodes is used, where each node can be used to sign a message. Each node is also used to sign up to ... | 11/14/1989 |
| 4661658 | Offline PIN validation with DES A method of offline personal authentication in a multi-terminal system uses a secret user PIN, a secret key and other nonsecret data stored on a customer memory card and a nonsecret validation value stored in each terminal connected in a network. The tech... | 04/28/1987 |
| 4309569 | Method of providing digital signatures The invention comprises a method of providing a digital signature for purposes of authentication of a message, which utilizes an authentication tree function of a one-way function of a secret number.... | 01/05/1982 |
