公开(公告)号：CA1258246A

公开(公告)日：1989-08-08

申请号：CA514907

申请日：1986-07-29

Applicant: IBM

Inventor： THORNE WILLIAM D ,  BROWN DOUGLAS S ,  PATTERSON WILLIAM A

IPC: B41J9/127 ,  B41J9/38 ,  H01F7/08 ,  B41F19/00

Abstract: ELECTROMAGNETIC HAMMER ACTUATOR FOR IMPACT PRINTER The present invention relates to an assembly of electromagnetic actuators for the hammers of an impact printer arranged side by side and extending along a line. Each actuator comprises a first stator part formed with at least one pole piece, a second stator part formed with at least one pole piece and positioned relative to the first stator part so that the pole pieces are spaced apart so as to form a gap therebetween. A single coil is associated with one of the stator parts. Each actuator also includes an armature member formed with a body of non-magnetizable material, at least one armature element of magnetizable material and a hammer head. The armature member is supported between the stator parts so that the armature element is located adjacent to the gap. Energization of the coil causes the generation of a flux which passes across the gap and through the armature element tending to move the armature element into the gap and to cause the hammer head to move into a print position. According to the invention the components of adjacent actuators are complementary in shape so that projecting components of each actuator engage in recessed components of the adjacent actuators whereby the overall length of the assembly along the line is less than the sum of the overall widths of the individual actuators.

公开(公告)号：DE102012213807A1

公开(公告)日：2013-02-28

申请号：DE102012213807

申请日：2012-08-03

Applicant: IBM

Inventor： BROWN DOUGLAS S ,  KELLEY JOHN F ,  SEAGER TODD ,  TORRES ROBERT J

IPC: G06F21/62 ,  G09C1/00 ,  H04L9/32

Abstract: Bei einem Verfahren zum Steuern des Zugriffs auf ein verschlüsseltes Dokument empfängt ein Computer eine Anforderung auf Zugriff auf das verschlüsselte Dokument, wobei die Zugriffsanforderung eine Benutzer-ID und ein Benutzerkennwort umfasst. Der Computer führt an dem Benutzerkennwort eine Einweg-Hash-Funktion durch, um einen Hash-Wert zu erzeugen. Der Computer durchsucht eine Zugriffskontrolltabelle nach dem Hash-Wert, der eine Berechtigung des Benutzers anzeigt, auf das verschlüsselte Dokument zuzugreifen, und entspricht einem Dokumentkennwort, das mit dem Benutzerkennwort verschlüsselt ist. Der Computer entschlüsselt mithilfe des Benutzerkennworts das Dokumentkennwort. Der Computer entschlüsselt mithilfe des entschlüsselten Dokumentkennworts das verschlüsselte Dokument.

公开(公告)号：CA2776182A1

公开(公告)日：2013-02-23

申请号：CA2776182

申请日：2012-05-07

Applicant: IBM

Inventor： BROWN DOUGLAS S ,  KELLEY JOHN F ,  SEAGER TODD ,  TORRES ROBERT J

IPC: G06F21/62 ,  H04L9/32 ,  H04L12/58

Abstract: In a method for controlling access to an encrypted document, a computer receives a request to access the encrypted document, the access request comprising a user ID and a user password. The computer performs a one-way hash function on the user password to generate a hash value. The computer searches an access control table for the hash value which indicates an authorization for the user to access the encrypted document and corresponds to a document password encrypted with the user password. The computer decrypts the document password using the user password. The computer decrypts the encrypted document using the decrypted document password.