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All.About.CAPTCHAs.Decoding.CAPTCHAs.for.Fun
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2016-02-18
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Looking for a practical guide to CAPTCHA decoding? All About CAPTCHA’s. This eBook will teach you how to identify weaknesses and exploit CAPTCHA’s from beginning to end. Welcome to the practical guide to decoding CAPTCHA's. Everything you need to start decoding CAPTCHA's is contained within. Although there is a heavy emphasis on decoding you can consider it a general guide to CAPTCHA's in general. Although mostly focused on algorithmic methods of decoding CAPTCHA's this will also briefly cover paid/human services, history and anecdotes.
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AllaboutCAPTCHA’s
DecodingCAPTCHA’sforFunandProfit
BenE.C.Boyter
Thisbookisforsaleathttp://leanpub.com/decodingcaptchas
Thisversionwaspublishedon2015-08-03
*****
ThisisaLeanpubbook.LeanpubempowersauthorsandpublisherswiththeLean
Publishingprocess.LeanPublishingistheactofpublishinganin-progressebookusing
lightweighttoolsandmanyiterationstogetreaderfeedback,pivotuntilyouhavetheright
bookandbuildtractiononceyoudo.
*****
©2014-2015BenE.C.Boyter
TableofContents
1.What’sthedeal?
1.1Whoisthisbookfor?
1.2Welcome
1.3Glossary/Lingo
1.4RecommendedReading
1.5HowtodecodeaCAPTCHA
1.6HowtobreakaCAPTCHA
2.BriefHistoryofCAPTCHA’s
2.1WhatisaCAPTCHA?
2.2WhoinventedtheCAPTCHA?
2.3Usage
2.4TheFuture
3.HowtoIdentifyWeaknessinCAPTCHA
3.1LettersandNumbers
3.2Uppercase/Lowercase
3.3ConstantFont
3.4AlignedCharacters
3.5Rotation
3.6Deformations
3.7TexturedBackground
3.8ColourVariation
3.9CharacterPosition
3.10ConstantBackground
3.11SmallDictionary
3.12DictionaryWords
3.13ConnectedLetters
3.14FixedFontSize
4.ExamplesofGoodandBadCAPTCHA’s
5.ExtractingCharactersFromtheBackground
5.1MultivaluedImageDecomposition
5.2EdgeDetection
5.3DisjointSets
6.IdentifyingTextLocations
6.1BlurChecking
6.2FixedPosition
6.3VerticalSlices
6.4LetterDipChecks
6.5DisjointSets
6.6ExtractandTest
7.TheTrainingSet
7.1NeuralNetworkFolliesbyNeilFraser
7.2Storingthetrainingsets
8.TextualImageRecognition
8.1NeuralNetworks
8.2VectorSpace
8.3Bayesianfilters
8.4SupportVectorMachine
9.NeuralNetworksExample
10.VectorSpaceExplained
10.1VectorSpaceImplementations
11.ImprovingRecognition
11.1Clearingnoise
11.2Thinning
11.3EndpointDetection
11.4LineThickening
11.5ColourReduction
11.6Spellcheck
11.7DictionaryCheck
11.8CommonPitfalls
12.DecodingasimpleCAPTCHA
12.1IdentifyTextinCAPTCHAandExtract
12.2ImageRecognition
12.3Buildingatrainingset
12.4Puttingitalltogether
12.5Results
13.Don’tWriteYourOwnCAPTCHA
14.WhyCAPTCHA’sshouldneverusethenumbers0157
15.ToolsandArticles
16.AlternativestoCAPTCHA
16.1HoneyPotFields
16.2StupidlySimplyCAPTCHA
16.3RequireLogin
16.4CommunityParticipiation
16.5Blacklisting
16.6Whitelisting/OnlineServices
16.7Conclusion
剩余59页未读,继续阅读
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