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Network Encryption

Network Encryption. Vince Ceccarelli Group 7 TC 200. What is Encryption?. Encryption – a process that hides the content of a message in such a way that it can be revealed through a decryption process Encryption and decryption are processes of Cryptography

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Network Encryption

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  1. Network Encryption Vince Ceccarelli Group 7 TC 200

  2. What is Encryption? • Encryption – a process that hides the content of a message in such a way that it can be revealed through a decryption process • Encryption and decryption are processes of Cryptography • Cryptography - study of techniques using secret writing as codes or ciphers

  3. How is it done? • The cryptography process uses encryption/decryption algorithms • The algorithms use a key - a long sequence of bits (1s, 0s) • The key is used to alter the original message mathematically to create a new encrypted/decrypted message

  4. Keys • The keys provide the necessary means of protection • They must be kept secret or anyone with knowledge of them would be able to crack the decryption process with the right algorithm • In some cases two keys are used, one for encryption and one for decryption • This can make the encryption key public and the decryption key private

  5. Keys and Bits • Keys are determined by the amount of bits they have (amount of numbers) • All the possibilities of a 2-bit key: 00,01,10,11 • A 3-bit key has 8 possible values • Possible values formula • 2^n (n being the number of bits) • 40-bit key has 1.099511628E12(2^40)

  6. Types of Encryption Algorithms • RSA • DES/3DES • BLOWFISH • IDEA • SEAL • RC4

  7. RSA • Created in 1977 by Ron Rivest, Adi Shamir, and Len Adleman • Uses public and private key • Starts with 2 large prime numbers • Goes through long math process • Results in a public and private key

  8. DES/3DES • Data Encryption Standard • Developed by U.S. Government in 1977 • Uses a 56-bit key • Used in ATMs • 3DES is the same thing except it encrypts the data 3 times and uses a different key for at least one of the passes • This creates a cumulative key size of 112-168 bits

  9. BLOWFISH • Designed by Bruce Schneider in 1993 • Uses keys from 32 to 448 bits • It was a fast, free alternative to encryption algorithms when it came out

  10. IDEA • Developed by Dr. X. Lai and Prof. J. Massey in Switzerland in early 1900s • Replaced the DES standard • Uses a 128 bit key • Said to be impossible to break by checking every key • No other means of attack is known

  11. SEAL • Software-optimized Encryption Algorithm • Designed by Rogaway and Coppersmith in 1993 • Uses a 160 bit key • Is a Stream-Cipher – data is encrypted continuously as opposed to Block Ciphers (DES, BLOWFISH, and IDEA)

  12. RC4 • Invented by Ron Rivest, Co-Producer of RSA • Used in Lotus Notes and Netscape • Uses up to a 2048-bit key • Useful in situations in which a new key can be used for each message

  13. SOURCES • http://compnetworking.about.com/od/networksecurityprivacy/l/aa011303a.htm • http://www.mycrypto.net/encryption/crypto_algorithms.html • http://www.cohn-family.com/images/cert-rsa-encryption.jpg • http://gnrt.terena.org/gfx/book/ProtectingUsers/public-key-encryption_smaller.gif • http://gnrt.terena.org/gfx/book/ProtectingUsers/single-key-encryption_smaller.gif • http://www.skilldrive.com/book/DOTNET%20in%20Samples_soubory/image042.gif

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