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3 years ago

Write an expression whose value is the string that consists of the first four characters of string s.

Computers and Technology

1 answer:

Ipatiy [6.2K]3 years ago

8 0

Answer:

The correct expression for the following question is :s[0 : 4]

Explanation:

The string is the collection of characters It terminated by the NULL character in the c programming language. The s[0 : 4] expression holds the first four characters of string s. In the expression it starts to the position "0" and goes to the index value "4" .in this string it holds the value up to the four characters.

We can store the four-character in the string:s[0 : 4].

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Answer:

Following are the solution to this question:

Explanation:

In point 1:

Trials frequency $= \frac{100 \ million }{second}$

calculating the main length of cryptography = 112 bit

$\to 100\ Million = 1 \times 10^8$

calculating the second year value:

$\to 365 \times 24 \times 60 \times 60 =3153600\\\\$

$=3.15 \times 10^7 \ seconds$

Currently, in average , at least half the possible sleeves is being used to verify the encryption process: $2^{111} \ keys$

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In point 2:

In cryptography, the common name is Triple DES (3DES), which would be the symmetric-key encrypted communication algorithm (TDEAor Triple DEA), which adds 3 times per block size only with the cryptographic method Data Encryption Standard ( DES).

Algorithm:-

The key package involves four DES keys, K1, K2, and K3, each 56-bit (except parity bits), Triple DES includes. Its encoding algorithm is::

$ciphertext = EK3(DK2(EK1(plaintext)))$

I.e. K1, DES encrypt, K2 decrypt, then K3 encrypt DES.

The reverse is the decryption:

$plaintext = DK1(EK2(DK3(ciphertext)))$

I.e. decrypt by K3, crypt by K2, decrypt by K1.

Every three-bit authentication encrypts a 64-bit block.

Its middle procedure in each situation it's the reverse of the first operation. It improves the strength of the key second option algorithm which offers DES native support with key option 3.

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