Security Definition(CambridgeDictionaryofEnglish) Abilitytoavoidbeingharmedbyanyrisk,dangeror threat …therefore,inpractice,animpossiblegoal Whatcanwedothen? Beassecureasneeded Abilitytoavoidbeingharmedtoomuchby reasonablypredictablerisks,dangersorthreats ...
Messageauthentication消息认证Dataoriginauthentication用户认证DataIntegrity(完整性)Theassurancethatdatareceivedareexactlyassentbyanauthorizedentity.(Messagesarenotaltered)保证接收与发出的内容一致,没有经过修改、插入、删除或重放1.3SecurityServices4)Non-repudiation不可抵赖(否认)性功能:Preventeithersenderorreceiverfromdenyi...
Thekeyforaone-timepadcipherisastringofrandombits,usuallygeneratedbyacryptographicallystrongpseudo-randomnumbergenerator(CSPRNG). Itisbettertogeneratethekeyusingthenaturalrandomnessofquantummechanicalevents(suchasthosedetectedbyaGeigercounter),sincequantumeventsarebelievedbymanytobetheonlysourceoftrulyrandominformationinthe...
5 Key functions of IDPS Technologies Analyse and monitor events to identify undesirable activity Recording information related to observed events Notifying security administrators of important events Producing reports. The IPS stops the attack itself The IPS change the security environment The IPS changes ...
security Parameters t, are what we ultimately care about in the real world Does not lead to a clean theory... Sensitive to exact computational model can be (t, )-secure for many choices of t, Would like to have schemes where users can adjust the achieved security as...
–Malleabilityvs.SemanticSecurity–ChosenCiphertextAttacks:•CCA1:Preprocessing(Lunchbreak)•Postprocessing –ApproachesforachievingmalleabilityandresistancetoCCA:•Independentkeys•Proofsofconsistency•Cramer-ShoupCryptosystem –Applications •InteractiveAuthentication•Auctions Allcombinationsareusefulinsome...
httpwwwcssemonasheduaucoursewarecse25002006pptcryptographyppt 下载积分:1000 内容提示:yp g p y Introduction to Cryptography --- Foundations of information security --- Lecture 7 Outline cryptology? Why study cryptology? Basic terms, notations and structure of cryptography Private & public key ...
The encryption that is used for binary documents (.doc, .xls, .ppt) uses RC4. It isn't recommended, as discussed in Security Considerations sections 4.3.2 and 4.3.3 of the Office Document Cryptography Structure Specification. Documents that are saved in the older Office binary formats can ...
Cryptography and network security = 密码学与网络安全 /-2nd ed Network coding has generated much interest in information and coding theory, networking, wireless communications, cryptography, and computer science in the... Kahate,Atul - Cryptography and network security = 密码学与网络安全 /-2nd ed ...
Public-Key Encryption Needed for security: One of the keys must be kept secret Impossible (at least impractical) to decipher message if no other information is available Knowledge of algorithm, one of the keys, and samples of ciphertext must be insufficient to determine the other key CSCE 522...