Cypher User Manual

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Additional Functions and Features

Cipher Type Selection and Type-specific Options

Tools for decrypting different types of ciphers can be made available by choosing the appropriate cipher typefromthe Options menu. Once the cipher type is selected, a dialogboxwill prompt the user for the options to be used for that mode of cipherdecryption.In this way it is also possible to change the options for the current decryption mode. Display of Results Using the View menu, results of statistical analysis can be displayed in either tabular or histogram format.As well, the data displayed can be changed from single character analysis to digrams or trigrams, also available in tabular or histogramformat. The single character histogram is plotted alphabetically to aid in determining any possible shift encryptions, but the digram and trigram histograms are plotted in decreasing order of frequency. If the resultsof the histogramare hard to see, click once on the histogram and a new window will pop-upwith a larger version of that image. Changing the Dictionary Under the Options menu, choose"Loadnew dictionary" and follow the prompts. Automated Cipher DecryptionSelect "Automated Cipher Decryption"from the Options menu. A pop-up box will appear prompting for the type of cipher to be used, potential key if any, and any other necessary or relevant information (perhaps choice of algorithm, or inclination toencryption type,or selection of multiple cipher types to be attempted?) for decrypting the message. As well, the user can select whether to attempt to decipher the message using a random or iterative key search approach. The dictionary auto-lookup function provides the means of determining the success of decryption; key sequences leading to the highest percentage of matches are likely tobe the actual decryption key.