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• What is encryption

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• Symmetric Encryption
   • Block ciphers
   • Stream ciphers
• Asymmetric Encryption
(Secret key Encryption)

• Encryption Algorithms
   • Types of encryption algorithms
    Symmetric algorithms (Secret key)
      • AES (Advanced Encryption Standard)
      • Blowfish
      • CAST5
      • DES (Digital Encryption Standard)
      • IDEA
      • RC2
      • RC4
      • RC6
      • Serpent
      • Triple DES
      • Twofish
    Asymmetric algorithms (Public key)
      • RSA
      • Diffie-Hellman
      • Digital Signature Algorithm
      • ElGamal
      • ECDSA
      • XTR
   • Symmetric vs asymmetric algorithms
   • Strength of cryptographic algorithms

• Attacks on cryptosystems

• Multiple encryption

• Public key Encryption

• Encryption Glossary

Stream Ciphers

What are stream ciphers?
Stream Ciphers vs Block ciphers

Stream ciphers
Stream ciphers encrypt the bits of information one at a time - operate on 1 bit (or sometimes 1 byte) of data at a time (encrypt data bit-by-bit). Stream ciphers are faster and smaller to implement than block ciphers, however, they have an important security gap. If the same key stream is used, certain types of attacks may cause the information to be revealed.

Stream Ciphers vs Block ciphers
Stream ciphers are faster and smaller to implement than block ciphers, however, they have an important security gap. If the same key stream is used, certain types of attacks may cause the information to be revealed.

The difference between block ciphers and stream ciphers?
A stream cipher consists of a state machine that outputs at each state transition one bit of information. This stream of output bits is commonly called the running key. The state machine is nothing more than a pseudo-random number generator.
Block ciphers encrypt information by breaking it down into blocks and encrypting data in each block. A block cipher encrypts data in fixed sized blocks (commonly of 64 bits).





Asymmetric algorithms
Public key algorithms
Secret key algorithm
Block ciphers
DES encryption
Advanced Encryption Standard
Multiple encryption
AES encryption
Blowfish encryption
Public key Encryption
Symmetric algorithms
RC4 encryption
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