Computer Encryption

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Computer Encryption Computer Encryption By: Amy Lam By: Amy Lam Encryption! Where? Encryption!

Where? " " Translation of data into a secret code. Translation of data into a secret code.

" " Most effective way to achieve security. Most effective way to achieve security. " " Prevents unauthorized users from reading data.

Prevents unauthorized users from reading data. How To Identify Encryption How To Identify Encryption " " Plaintext Plaintext 3 3 Unencrypted readable data in an Unencrypted readable data in an encryption process. encryption process.

" " Ciphertext Ciphertext 3 3 The encrypted or scrambled data The encrypted or scrambled data in an encryption process. in an encryption process. Examples: Examples: Plain Plain = Computer = Computer Ciphertext Ciphertext = HCHOHMHPHUHTHEHRH = HCHOHMHPHUHTHEHRH Sample Methods of Sample Methods of Encryption Encryption ACIVTIN ACIVTIN ACTIVATION ACTIVATION Compaction Compaction HUHSHEHRH HUHSHEHRH USER USER Expansion Expansion OSTFAWER OSTFAWER SOFTWARE SOFTWARE Transposition Transposition RTILNBAVRLT RTILNBAVRLT INFORMATION INFORMATION Substitution Substitution Ciphertext Ciphertext Plaintext Plaintext Name Name Secure Data Over Internet Secure Data Over Internet " " Users can prevent people from reading private Users can prevent people from reading private information by encrypting it or signing it information by encrypting it or signing it digitally.

digitally. - - Most ... more. less.

Popular e Most Popular e - - mail encryption programs is PGP, mail encryption programs is PGP, Pretty Good Privacy. Pretty Good Privacy. - - PGP is a freeware for personal, noncommercial PGP is a freeware for personal, noncommercial users. users. Go to Go to www.pgp.com www.pgp.com or or www.pgpi.com www.pgpi.com . . Symmetric Key Symmetric Key " " Key used by both parties. Key used by both parties. " " Both sender & recipient have identical digital Both sender & recipient have identical digital keys to encrypt and decrypt. keys to encrypt and decrypt. " " Very efficient in terms of resources. Very efficient in terms of resources. " " Normally preferred for bulk transmission of Normally preferred for bulk transmission of data. data. " " Simpler and Faster to use. Simpler and Faster to use. " " Example of symmetric key is DES Example of symmetric key is DES DES DES " " American Government Standard since American Government Standard since 1977. 1977. " " An Algorithm that transforms blocks of An Algorithm that transforms blocks of data instead of individual characters. data instead of individual characters. " Employs 56 bit keys. " Reasonably strong cryptography scheme. Triple DES Triple DES " " Variant of the DES scheme. Variant of the DES scheme. " " Applying DES algorithm three times to plain Applying DES algorithm three times to plain text. text. " " Used by many financial institutions. Used by many financial institutions. Public Key Public Key " " AKA Asymmetric Key. AKA Asymmetric Key. " " Allows remote users to exchange encrypted data Allows remote users to exchange encrypted data without a digital key in advance. without a digital key in advance. " " Disadvantage = Slow Disadvantage = Slow " " Each party has personal pair of keys, Private and Each party has personal pair of keys, Private and Public. Public. " " Private = Secret Private = Secret " " Public = Everyone Public = Everyone Public Key Continued Public Key Continued " " Also used to create and verify digital Also used to create and verify digital signature. signature. " " Digital Signature is an encrypted code. Digital Signature is an encrypted code. " " A person, website or company attaches it A person, website or company attaches it to an electronic message. to an electronic message. " " PKI PKI - - Public Key Infrastructure is used for Public Key Infrastructure is used for electronic commerce transactions. electronic commerce transactions. " " Web Web - - site that uses encryption, is called a site that uses encryption, is called a secure site. secure site. Summary Summary " " Encryption is a process of converting readable Encryption is a process of converting readable data into unreadable characters for security. data into unreadable characters for security. " " Two types of Encryption Two types of Encryption . . 3 3 Public Key Public Key 3 3 Symmetric Key Symmetric Key " " Symmetric Key is simpler and faster. Used by Symmetric Key is simpler and faster. Used by government and more efficient and secure. government and more efficient and secure. " " Public Key is slower, has a private and public Public Key is slower, has a private and public key. key. " " Used by financial and commercial institutions, Used by financial and commercial institutions, such as banks an corporations. such as banks an corporations. Summary Continued Summary Continued " " Websites using encryption = secure site. Websites using encryption = secure site. " " Users are able to encrypt their own messages by Users are able to encrypt their own messages by going to (PGP) Pretty Good Privacy. going to (PGP) Pretty Good Privacy. Works Cited Works Cited Ince Ince , Darrel. , Darrel. Developing Distributed and E Developing Distributed and E - - Commerce Commerce Applications Applications . New York: Pearson Educational . New York: Pearson Educational Limited, 2002. Limited, 2002. Cashman Cashman , Thomas J., Shelly, Gary B., and , Thomas J., Shelly, Gary B., and Vermaat Vermaat Misty E. Misty E. Discovering Computers 2007, Discovering Computers 2007, A Gateway A Gateway to Computers. USA: Thomson Course Technology, to Computers. USA: Thomson Course Technology, 2007. 2007. Kessler, Gary C. Kessler, Gary C. c c An Overview of Cryptography. An Overview of Cryptography. d d Auerbach Auerbach (1998). (1998).

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