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Questions and Answers
What is the primary security service provided by the earlier cryptographic systems?
What is the primary security service provided by the earlier cryptographic systems?
- Confidentiality of information (correct)
- Availability of information
- Authentication of information
- Integrity of information
What is the Caesar Cipher also known as?
What is the Caesar Cipher also known as?
- Poly-alphabetic cipher
- Playfair Cipher
- Transposition Cipher
- Shift Cipher (correct)
What is the 'shift number' used for in the Caesar Cipher?
What is the 'shift number' used for in the Caesar Cipher?
- Integrity checking
- Authentication
- Decryption
- Key generation (correct)
In which type of scheme are pairs of letters encrypted rather than single letters?
In which type of scheme are pairs of letters encrypted rather than single letters?
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What is the primary basic element used in earlier cryptographic systems?
What is the primary basic element used in earlier cryptographic systems?
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Study Notes
Primary Security Service
- Earlier cryptographic systems primarily provided confidentiality by hiding the content of messages from unauthorized users.
Caesar Cipher
- The Caesar Cipher is also known as a substitution cipher, where each letter in the plaintext is shifted a certain number down or up the alphabet.
Shift Number
- The 'shift number' in the Caesar Cipher determines how many positions each letter in the plaintext is moved, enabling the encryption and decryption process.
Polygraphic Substitution
- In polygraphic substitution schemes, pairs of letters, known as digraphs, are encrypted rather than individual letters, enhancing security compared to simple ciphers.
Basic Elements in Cryptography
- The primary basic element used in earlier cryptographic systems is the substitution of characters, which involves replacing one character with another according to a fixed system.
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