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Who actually invented the first public-key cryptography systems is still up for debate Ronald Rivest, Adi Shamir, and Len Adleman invented RSA, another public-key system Later, it was widely held that asymmetric cryptography had been invented by James H Ellis at GCHQ, a British intelligence organization, even though the Diffie-Hellman and RSA algorithms had been previously demonstrated In the end, Diffie-Hellman and RSA, were shown to be the first public examples of high quality public-key cryptosystems and are among the most widely used In addition to encryption, public-key cryptography can be used to implement digital signature schemes Digital signatures are somewhat like ordinary signatures; they are easy for a user to produce but difficult for anyone else to forge Digital signatures can also be permanently tied to the content of the message being signed because they cannot be moved from one document to another; any attempt would be detectable.

The relation between Visual Studio and F# Interactive is different from typical Visual Studio add-ins It s useful to understand because the state of an F# Interactive session is separate from the Visual Studio state and can affect the process of testing and debugging in many subtle ways You can also manage external resources through NET and COM interfaces, including automating Visual Studio tasks, but accessing its interfaces is less easy than it may appear at first F# Interactive is a Visual Studio tool window2 that lets you interact with an fsiexe process like a standard console You communicate with the fsiexe process using standard streams This design choice ensures that a code mistake that causes the F# Interactive to hang doesn t affect the Visual Studio editor that contains the data.

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In digital signature schemes, there are two algorithms: one for signing, in which a secret key is used to process the message (or a hash of the message or both), and one for verification, in which the matching public key is used with the message to check the validity of the signature RSA and DSA are two of the most popular digital signature schemes Digital signatures are central to the operation of public-key infrastructures and to many network security schemes (SSL/TLS, many VPNs, and so on) Digital signatures provide users with the ability to verify the integrity of the message, thus allowing for nonrepudiation of the communication Public-key algorithms are most often based on the computational complexity of hard problems, often from number theory.

You can restart F# Interactive from the tool window and obtain a fresh new instance without having to restart Visual Studio Restarting F# Interactive during testing and debugging ensures a clean environment Consider, for example, a class whose instances open the same file During a test, the file may be locked by an instance and become inaccessible due to variable redefinition; at some point, the garbage collector runs the finalizer and may close the file, slowing the iterative process of testing with F# Interactive Sometimes, redefinition causes problems too: a class definition may be evaluated before you make additional changes, and the interface may then behave differently than the one in the program editor; you may continue to evaluate code that refers to the older version In these cases, restarting F# Interactive is an option and returns you to a clean state.

Using Visual Studio automation, you can use F# Interactive to access objects exposing functionalities of the programming environment The DTE and the DTE2 interfaces are the entry points to the entire Visual Studio object model For instance, you can print the full path of the active document window: #r @"EnvDTEdll" #r @"EnvDTE80dll" open SystemRuntimeInteropServices let appObj =MarshalGetActiveObject("VisualStudioDTE") : > EnvDTE80DTE2 printfn "%s" (appObjActiveDocumentFullName) You use the GetActiveObject method to obtain a reference to the Visual Studio object model, and then you use the NET assembly containing the interface generated from the COM types to access the object model In this example, you connect to a running instance of Visual Studio (usually the first one started), not necessarily the same one associated with the F# Interactive executing the code.

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