Certificates are used to authenticate. We authenticate in order to protect confidentiality.
SHA1- hashes
MD5 –“ “Hashes are numerical code that encrypts data.
Public Key Encryption scrabbles the algorithm with RSA. It is a key.
We limit access by authenticating our users.
For authentication we need technologies such as o Hardware: server o Software: Public Key Infastructure (PKI) , DES o Information : Keys/Certificates
The strongest way to send a message is with “code”. Code is a method to transform a message into an obscure form. It takes plaintext and substitutes it with other characters/symbols. The problem is that the code has to be shared.
Plaintext in computer is covered by ASCII (each character = 1 byte)
Cipher - transformations of plaintext.A cipher is a an algorithm for performing encryption or decryption. Mathematical · Symmetric key ciphers. Can be hacked by brute force attacks. To make is safe, make it a long number. Good for stored information. o EX: Data Encryption Standard (DES) – 56 bits, Bowfish, AES (128 and 256)
· Asymmetric Key – 2 keys (1 is public and 1 is private). They are nonreversable. The public key only to enrypt. ( 1 way) The private key decrypts the data. Protect the private key!!!!
Protect transmitted data Authenticate – digital signature
Cracking of the Key
Bruce Schneier – Implementation PGP example: PKI needs 2 prime #s
SHA1- hashes
MD5 –“ “Hashes are numerical code that encrypts data.
Public Key Encryption scrabbles the algorithm with RSA. It is a key.
We limit access by authenticating our users.
For authentication we need technologies such as
o Hardware: server
o Software: Public Key Infastructure (PKI) , DES
o Information : Keys/Certificates
The strongest way to send a message is with “code”. Code is a method to transform a message into an obscure form. It takes plaintext and substitutes it with other characters/symbols. The problem is that the code has to be shared.
Plaintext in computer is covered by ASCII (each character = 1 byte)
Cipher - transformations of plaintext.A cipher is a an algorithm for performing encryption or decryption.
Mathematical
· Symmetric key ciphers. Can be hacked by brute force attacks. To make is safe, make it a long number. Good for stored information.
o EX: Data Encryption Standard (DES) – 56 bits, Bowfish, AES (128 and 256)
· Asymmetric Key – 2 keys (1 is public and 1 is private). They are nonreversable. The public key only to enrypt. ( 1 way) The private key decrypts the data. Protect the private key!!!!
Protect transmitted data
Authenticate – digital signature
Cracking of the Key
Bruce Schneier – Implementation
PGP example: PKI needs 2 prime #s