G - Physics – 06 – F
Patent
G - Physics
06
F
G06F 12/14 (2006.01) G06F 21/00 (2006.01)
Patent
CA 2153879
An authentication method (30) that permits a user (12) and a file serving workstation (13) to mutually authenticate themselves. This is accomplished by exchanging a random number that is encrypted by a password (22) that is known to the user (12) and stored in a password file on the file serving workstation (13). A logon ID (21) is sent from the client workstation (11) to the server workstation (13). The stored user password (22) corresponding to the user ID (21) is retrieved from the password file. A random number is created that is encrypted by a symmetric encryption algorithm on the server workstation (13) using the retrieved user password (22), and which provides an encrypted password (24). The user (12) is then requested to enter the password (22) into the user workstation (11). The entered password (22) is used to decrypt the encrypted password (24) received from the server workstation (13) and retrieve the random number therefrom to authenticate the server workstation (13). The random number is then used as the encryption and decryption key for communication between the user and server workstations (11, 13). An encrypted message is transmitted using the random number from the client workstation (12) to the server workstation (13). The encrypted message is decrypted at the server workstation (13) to authenticate the user (11).
Moteur à percussion hydraulique, sous forme d'une foreuse fond de trou hydraulique, possédant une soupape cylindrique (40) pourvue de deux surfaces d'attaque (A1 et A2) de dimension égale et dirigées dans des sens opposés. La soupape possède également une troisième surface d'attaque (A3) plus petite que les deux autres et sous pression continue. La troisième surface d'attaque (A3) agit dans le même sens que la deuxième surface d'attaque (A2). Quand la première surface d'attaque (A1) est sous pression, mais non la deuxième surface d'attaque (A2), la soupape se déplace dans un sens et quand la première et la deuxième surfaces d'attaque (A1 et A2) se trouvent sous pression égale (pression totale ou absence de pression), la soupape se déplace dans l'autre sens sous l'effet de la troisième surface d'attaque (A3).
Bathrick Erwin Ward
Huang Cheng-Chi
Kung Kenneth C.
Ma Mae-Hwa
Matthews Todd E.
Hughes Electronics Corporation
Sim & Mcburney
LandOfFree
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