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Được đăng lên bởi Nam Trinhviet
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Crypto studies - the tools of formal methods.
Cryptography is the study of mathematical techniques related to aspects of providing
information security services.
Let discuss further about Cryptography. This field could be seen as a branch of applied
mathematics, however with strong relations to other fields in secure communication,
information theory and computing disciplines in general.
Cryptographers work on formal methods in building secure systems of storing and processing
information and communicating between its parts, all under the present of adversaries. Most
of the time, the main concerns are about constructing and analyzing cryptographic protocols
which enable parties to achieve certain security objectives. Remind that a protocol (or a
scheme) is a suite of procedures that tell each party what to do, which are usually computer
algorithms.
Cryptographers devise and analyze protocols under attack model, where one consider
assumptions about the resources and actions available to the adversary: we assume what the
adversary can do and cannot do against the system. So, a good practice for everyone in
studying cryptography and the art of building a secure system is to develop a way of thinking as
an adversary; thus, we can foresee bad intentions and discover weaknesses in a system and
potentially consequent wrongdoings.
Cryptanalysis is the study of mathematical techniques for attempting to defeat
information security services
While Cryptography is about constructing secure systems, Cryptanalysis is about breaking
systems, that is against what one do in the former field. Of course, cryptanalysis is not just for
bad intents. In fact, good cryptanalysis of a system will tell us what inside a system can be a
weakness, i.e. a security hole, so could be a target for adversaries. Therefore, cryptanalysis
provides us with lessons to learn to build systems towards the strongest possible security.
Therefore, we still have the combination - Cryptology as the study of both cryptography
and cryptanalysis.

Basic terms
We discuss some basic terms about the story of encryption – the foundation of anything in
cryptography. Alice and Bob are two colleagues who want to talk secretly over a public
communication channel, which we can think of as using an IM (Internet Messaging) for
example. Eve, an assumed adversary, may sneak in this to observe any IP packets sent between
Alice and Bob.

So Alice need to encrypt her message before sending to Bob, who will need to decryp...
Crypto studies - the tools of formal methods.
Cryptography is the study of mathematical techniques related to aspects of providing
information security services.
Let discuss further about Cryptography. This field could be seen as a branch of applied
mathematics, however with strong relations to other fields in secure communication,
information theory and computing disciplines in general.
Cryptographers work on formal methods in building secure systems of storing and processing
information and communicating between its parts, all under the present of adversaries. Most
of the time, the main concerns are about constructing and analyzing cryptographic protocols
which enable parties to achieve certain security objectives. Remind that a protocol (or a
scheme) is a suite of procedures that tell each party what to do, which are usually computer
algorithms.
Cryptographers devise and analyze protocols under attack model, where one consider
assumptions about the resources and actions available to the adversary: we assume what the
adversary can do and cannot do against the system. So, a good practice for everyone in
studying cryptography and the art of building a secure system is to develop a way of thinking as
an adversary; thus, we can foresee bad intentions and discover weaknesses in a system and
potentially consequent wrongdoings.
Cryptanalysis is the study of mathematical techniques for attempting to defeat
information security services
While Cryptography is about constructing secure systems, Cryptanalysis is about breaking
systems, that is against what one do in the former field. Of course, cryptanalysis is not just for
bad intents. In fact, good cryptanalysis of a system will tell us what inside a system can be a
weakness, i.e. a security hole, so could be a target for adversaries. Therefore, cryptanalysis
provides us with lessons to learn to build systems towards the strongest possible security.
Therefore, we still have the combination - Cryptology as the study of both cryptography
and cryptanalysis.
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