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1. |
Record Nr. |
UNINA9910451067703321 |
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Autore |
Porter Thomas |
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Titolo |
Practical VoIP Security [[electronic resource] /] / Thomas Porter, et al |
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Pubbl/distr/stampa |
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Rockland, MA, : Syngress Publishing, c2006 |
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ISBN |
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1-281-03569-6 |
9786611035693 |
0-08-048955-9 |
1-4237-5774-2 |
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Descrizione fisica |
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1 online resource (592 p.) |
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Disciplina |
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Soggetti |
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Internet telephony - Security measures |
Telecommunication |
Electronic books. |
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Lingua di pubblicazione |
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Formato |
Materiale a stampa |
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Livello bibliografico |
Monografia |
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Note generali |
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Nota di contenuto |
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Cover; Contents; Chapter 1 Introduction to VoIP Security; Chapter 2 Asterisk Configuration and Features; Chapter 3 The Hardware Infrastructure; Chapter 4 PSTN Architecture; Chapter 5 H.323 Architecture; Chapter 6 SIP Architecture; Chapter 7 Other VoIP Communication Architectures; Chapter 8 Support Protocols; Chapter 9 Threats to VoIP Communications Systems; Chapter 10 Validate Existing Security Infrastructure; Chapter 11 Confirm User Identity; Chapter 12 Active Security Monitoring; Chapter 13 Logically Segregate Network Traffic; Chapter 14 IETF Encryption Solutions for VoIP |
Chapter 15 Regulatory ComplianceChapter 16 The IP Multimedia Subsystem: True Converged Communications; Chapter 17 Recommendations; Index |
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Sommario/riassunto |
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Voice Over IP (VoIP) phone lines now represent over 50% of all new phone line installations. Every one of these new VoIP phone lines and handsets must now be protected from malicious hackers because these devices now reside on the network and are accessible from the Internet just like any server or workstation.This book will cover a wide variety of the publicly available exploit tools and how they can be used |
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specifically against VoIP (Voice over IP) Telephony systems. The book will cover the attack methodologies that are used against the SIP and H.323 protocols as well as VoIP network |
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2. |
Record Nr. |
UNINA9910146563303321 |
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Autore |
Lipavský P (Pavel) |
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Titolo |
Bernoulli potential in superconductors : how the electrostatic field helps to understand superconductivity / / Pavel Lipavsky [and five others] |
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Pubbl/distr/stampa |
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Berlin ; ; Heidelberg : , : Springer-Verlag, , [2008] |
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©2008 |
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ISBN |
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Edizione |
[1st ed. 2008.] |
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Descrizione fisica |
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1 online resource (XV, 268 p.) |
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Collana |
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Lecture Notes in Physics ; ; Volume 733 |
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Disciplina |
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Soggetti |
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Electrostatics |
Superconductors |
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Lingua di pubblicazione |
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Formato |
Materiale a stampa |
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Livello bibliografico |
Monografia |
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Note generali |
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Bibliographic Level Mode of Issuance: Monograph |
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Nota di contenuto |
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History of the Bernoulli Potential -- Basic Concepts -- Balance of Forces -- Thermodynamical Correction -- Phenomenological Description -- Non-local Corrections -- Extended Ginzburg–Landau Theory -- Quasi-neutral Limit -- Diamagnetic Current at Surface -- Surfaces -- Matching of Electrostatic Potentials at Surfaces -- Diamagnetic Currents Deep in the Bulk -- Electrostatic Potential Above a Surface with Vortices -- Layered Structures -- Charge Transfer in Layered Structures -- Effect of the Electrostatic Field on the Superconductor -- Outlook and Perspectives. |
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Sommario/riassunto |
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The motion of electrons in superconductors seems to defy our imagination based on daily experience with Newtonian mechanics. This book shows that the classical concepts, such as the balance of forces acting on electrons, are useful for understanding superconductivity. The electrostatic field plays a natural part in this balance as it mediates forces between electrons at long distances. Due to its classical interpretation, the theory presented in this book is suitable for introductory courses. |
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