computer viruses and email attachments
Viruses and Email Attachments
Ngày tải lên :
28/10/2013, 13:15
... to data that your modem sends and receives to get email
addresses from your incoming and outgoing email, Web pages, and
files in your Internet cache folder.
Many viruses also include their own ... [ Team LiB ]
Viruses and Email Attachments
Some people like to send out joke programs to their friends and opening these is risky.
You have no way of knowing ... especially
with email attachments.
You know what viruses are, but what are trojan horses and spyware?
Trojan horses are small programs that permit hackers to take control
of your computer. At...
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Computer Viruses and Malware phần 1 pps
Ngày tải lên :
14/08/2014, 18:20
... viruses and worms, and its countermeasures.
The next chapter lays the groundwork with some basic definitions and
a
timeline
of
malware.
Then, on to viruses: Chapters 3, 4, and 5 cover viruses, ... course
on computer viruses and malicious software to senior undergraduate and grad-
uate students at the University of Calgary. It's been an interesting few years.
Computer viruses are ... propagation. It is
prudent to look for threats to all computers, not just to your own.
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COMPUTER VIRUSES AND MALWARE
On the other hand, a defender wants to do one of two things. First, the...
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Computer Viruses and Malware phần 2 ppsx
Ngày tải lên :
14/08/2014, 18:20
... hard-to-find, innovative,
and adaptive, qualities that can be used by computer viruses too ^
Traditionally, viruses can propagate within a single computer, or may travel
from one computer to another ... discovering these details is unusual.
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COMPUTER VIRUSES AND MALWARE
access and the costs incurred to clean up from it. He was fined, and sentenced
to probation and community service.^ Chapter 7 ... a
disk, binary code
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COMPUTER VIRUSES AND MALWARE
in applications, and interpreted code. It also includes source code, like ap-
plication scripting languages, and code that may require...
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Computer Viruses and Malware phần 3 ppt
Ngày tải lên :
14/08/2014, 18:20
... diverge.
42
COMPUTER VIRUSES AND MALWARE
start:
rl = 12
r2 = 34
r3 = rl + r2
=>
LI:
r2 = 34
goto L2
start:
rl = 12
goto LI
L2:
r3 = rl
+ r2
The instructions executed, and their ... to
work with known and unknown viruses, or using virus-specific methods which
only work with known viruses. (Virus-specific methods may catch unknown
variants of known viruses, however.)
The ... this classification, then disinfec-
tion and related issues, virus databases and virus description languages, and
some miscellaneous short topics.
Viruses 41
Instruction reordering. Instructions...
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Computer Viruses and Malware phần 4 pps
Ngày tải lên :
14/08/2014, 18:20
... polymorphic
viruses. A histogram can also be used to detect metamorphic viruses by
comparing the emulation histogram to histograms of known metamorphic
viruses. ^^^
64
COMPUTER VIRUSES AND MALWARE ... hash table
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COMPUTER VIRUSES AND MALWARE
Static heuristics
• Pro: Static heuristic analysis detects both known and unknown viruses.
• Con: False positives are a major problem, and a detected ... high operating speeds and low resource
requirements. They detect known and unknown viruses. ^^^
• Con: Detection only occurs after a virus has infected the computer,
and the source of the infection...
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William Stallings Computer Organization and Architecture P1
Ngày tải lên :
05/11/2013, 22:15
... I/O
• Devices and memory share an address space
• I/O looks just like memory read/write
• No special commands for I/O (No I/O instruction)
ü Large selection of memory access commands available
§ ... spaces
• Need I/O or memory select lines
• Special commands for I/O
üLimited set
Interrupt Driven I/O
Basic Operation
§ CPU issues read command
§ I/O module gets data from peripheral whilst CPU ... identifier
§ CPU commands contain identifier (address)
Design Issues
§ How do you identify the module issuing the interrupt?
§ How do you deal with multiple interrupts?
• i.e. an interrupt handler being...
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Working with Categories and Email
Ngày tải lên :
07/11/2013, 06:15
... LiB ]
Working with Categories and Email
Outlook supports categories on all items and, although no one thinks twice about using
them on calendars, tasks, and contacts, categories aren't ... Rules Wizard, open the Rules Wizard using
Tools, Rules and Alerts, New Rule:
1. Create a blank rule to check messages when they arrive and choose your
conditions. For this example, we'll ...
screen and select the contacts the rule will apply to. Click Next when you're
finished adding addresses.
3. Select the action Assign It to the Category Category. Edit the rule description and...
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Tài liệu The Little Black Book of Computer Viruses docx
Ngày tải lên :
09/12/2013, 17:15
... of Computer Viruses
The Basics of the Computer Virus
A plethora of negative magazine articles and books have
catalyzed a new kind of hypochondria among computer users: an
unreasonable fear of computer ... was
popular in the late seventies and early eighties as an operating
system for microcomputers based on the 8080 and Z80 microproc-
22 The Little Black Book of Computer Viruses
users on it. For starters, ... computer viruses. This hypochondria is pos-
sible because a) computers are very complex machines which will
often behave in ways which are not obvious to the average user, and
b) computer viruses...
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Tài liệu William Stallings Computer Organization and Architecture P2 pptx
Ngày tải lên :
12/12/2013, 09:15
... Swapping
Advantages of Segmentation
§ Simplifies handling of growing data structures
§ Allows programs to be altered and recompiled independently,
without re-linking and re-loading
§ Lends itself to sharing ... Dynamic Partitioning
Process States
Objectives and Functions
§ Convenience
• Making the computer easier to use
§ Efficiency
• Allowing better use of computer resources
Bonus
§ We do not need all ... Systems
§ Allow users to interact directly with the computer
• i.e. Interactive
§ Multi-programming allows a number of users to interact with the
computer
Process Scheduling
Process
Request
End
Long-Term
Queue
Short-Term
Queue
CPU
I/O...
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Tài liệu William Stallings Computer Organization and Architecture P4 docx
Ngày tải lên :
12/12/2013, 09:15
... some location depending on decision
William Stallings
Computer Organization
and Architecture
Chapter 9
Instruction Sets:
Characteristics
and Functions
Instruction Representation
§ In machine ... instruction and different addresses
• e.g. VAX
Number of Addresses (a)
§ # of address allowed in an instruction
§ Decide the categories of processor architecture
§ 3 addresses
• Operand 1, Operand 2, ... Increment (a++)
• Decrement (a )
• Negate (-a)
Standard …What Standard?
§ Pentium (80x86), VAX are little-endian
§ IBM 370, Moterola 680x0 (Mac), and most RISC are big-endian
§ Internet is big-endian
•...
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