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The content of session III and IV

SECURITY SERVICES

Some special services

SECURITY MECHANISMS are provided with cryptosystems

Cryptography

Encryption

Cryptosystems

Cryptography

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Other symmetric cryptosystem

Overview of DES

Distribution of symmetric keys

Single keysused in symmetric cryptography: problems and issues

Problems and solutions

Public key Cryptosystems

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Encryption mode in public key Cryptosystems

Authentication mode in public key Cryptosystems

Two types of public key systems

Rivest-Shamir-Adleman Encryption

Choosing keys

the RSA power

E-mail DES Key transferring via RSA

Digital signature

Digital signatures

Digital signature - cont..

Paul

RSA Digital signature

Hash function

RSA Digital signature using Hash function

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One time password

SMART CARD

KERBEROS-one time password system

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PGP or Pretty Good Privacy