What are the two basic functions used in encryption algorithms
Asked by admin @ in Computer Science viewed by 319 People
What are the two basic functions used in encryption algorithms?
Answered by admin @
The two basic functions used in encryption algorithms are:
- Substitution: The letters of plaintext are replaced by other letters or symbols or by numbers. It involves substituiting plaintext bit patterns with cipher text bit patterns.
There are many types of substitution techniques:
1.Caser cipher
2.Monoalphabetic cipher
3.Polyalphabetic cipher
4.Playfair cipher.
- Transposition: Here positions of plaintext bits are shifted accordingly, constitutes a permutation of plaintext.
Techinques in transposition are:
1.Rail-fence
2.columnar transposition
3.verman cipher.
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