SHA iButton Secrets and Challenges

Abstract:SeveralapplicationsusetheMaximSHAiButton®tokensforeCash,vending,farecollection,anduserauthentication.Theyrequiretheuseofsecretstorecognizeauthentictokensandtosecuredataandmonetaryvaluesagainsttampering.Thesecurityofanentirecryptographicsystemrestswithitsabilitytoproperlygenerateandprotectitssecretsandchallenges.Thisapplicationnotedescribesmethodstogenerateworld-classcryptographicsecretsandchallenges.Italsodescribesthedevicesthatcanholdthosevalueswheretheyaresafefromattack,anddescribesschemeswheresecretsneverleavetheprotectedsiliconenvironmentatanytimeandareneversubjecttocompromise.Maxim>AppNotes>1-WireDevicesiButtonSecurityandAuthenticationKeywords:SHAiButton,SHA-1,secret,MAC,challenge,authentication,ecash,entropy,randomnumbers,cryptography,digitalsignatureMar08,2002APPLICATIONNOTE152SHAiButtonSecretsandChallengesAbstract:SeveralapplicationsusetheMaximSHAiButtontokensforeCash,vending,farecollection,anduserauthentication.Theyrequiretheuseofsecretstorecognizeauthentictokensandtosecuredataandmonetaryvaluesagainsttampering.Thesecurityofanentirecryptographicsystemrestswithitsabilitytoproperlygenerateandprotectitssecretsandchallenges.Thisapplicationnotedescribesmethodstogenerateworld-classcryptographicsecretsandchallenges.Italsodescribesthedevicesthatcan