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Computer Science: A major reason that SSL/TLS is not used everywhere is because ofthe high cost of public-key cryptography.
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. Which of the following is required to verify that a sentence ins in a language defined by a grammar? creating a parse tree only, Creating a parse tree or a derivation, Creating a derivation only, Creating a new grammar.
2. When a grammar fails the pairwise disjointness test, which of the following can be used to alleviate problems? Right factoring, Refactoring, Reparsing, left factoring.
3. Which of the following productions would fail the pairwise disjointness test? A –> aB|bA|c, A–> aA|bc|cB, A–> a|b|c, A–>aA|ab
4. In recursive descent parsing, what is the relationship between the parser and the lexical analyzer? The parser calls the lexical analyzer only once, The parser repeatedly calls the lexical analyzer only once, The lexical analyzer calls the parser only once, The lexical analyzer repeatedly calls the parser only once
Given the following grammar, which of the following sentences is in the language it generates? S–>aB, B–>bB|b
aabbb, abba,ab, ba
6. How many sentences are in the language generated by the following grammar? S–>aB, B–>bB|b
8 ,0, An infinite number, 1
7. Which of the following is a correct English description of the language defined by the following grammar ? S–>Ba, B–>Bb|b
Any number of b’s followed by any number of a’s, One b followed by any number of a’s, Any number of b’s followed by one a, Any number of a’s followed by one b
public-key encryption is therefore so much less efficient then secret-key encryption?
The reason behind this is public key encryption is much slower than private key encryption and this is because it must realize a qualitatively harder feature to be able to publish the encryption key without revealing the decryption key.
This feature therefore requires heavier mathematics, compared to symmetric encryption which is “just” making a big tangle of bits.
Most known asymmetric encryption systems seem to achieve the needed security, but at some relatively heavy computational cost.