Recent questions tagged cryptography

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason RAssertion A: Asymmetric key cryptography is significant slower than sy...

Has functions are used to produce the message digests which are then encrypted with a private key to get:Public keyDigital signatureCipher textData Encryption Standard

The encrypted version of a message is “DEZA RWZMLW HLCXTYR.” If it was encrypted using the function f(p) = (p + 11) mod 26 (the Caesar cipher), what was the original mess...

Asymmetric encryption is not suitable forConfidentialityAuthenticationKey ExchangePrevention of Denial of Service 

An example of a public key encryption algorithm is :Caesar cipher algorithmDES algorithmAES algorithmKnapsack algorithm

Assume when encrypting $3$-bit plaintext with a block cipher with key $\text{K},$ the following ciphertext is obtained:$$\begin{array}{|c|c|}\hline \text{Plaintext} & \te...

A transposition cipher (but not a rail-fence cipher) was used to produce the following ciphertext:$\text{X 2! H M E S S S E 2 Y T A 2 I I A}$The key used was: $5 \; 2 \; ...

Which mode is a block cipher implementation as a self-synchronizing stream cipher?Cipher Block Chaining Mode,Cipher Feedback ModeElectronic Codebook ModeOutput Feedback M...

Match List I with List II:List IList II(A) DES(I) Key size - $256$(B) AES(II) Key size - $1024$(C) $3$ DES(III) Key size - $56$(D) RSA(IV) Key size -$168$ $(\text{A})-(\t...

Consider the following two statements:A Hash function, which is used for computing digital signatures, is an injective functionAn encryption technique such as $\text{DES}...

Which of the following is not needed by an encryption algorithm used in Cryptography?$\text{KEY}$MessageCiphertextUser details

____________ uses pretty good privacy algorithm.Electronic mailsFile encryptionBoth Electronic mails and File encryptionNone of the options

Which of the following property is related to a cryptographic hash functions?One way FunctionInversibleNon-DeterministicAll of the options

Using ‘RSA’ public key cryptosystem, if $p=3$, $q=11$ and $d=7$, find the value of $e$ and encrypt the number $’19’$$20, 19$$33,11$$3, 28$$77, 28$

Which among the following statement(s) is(are) true?A hash function takes a message of arbitrary length and generates a fixed length codeA hash function takes a message o...

If $h$ is chosen from a universal collection of hash functions and is used to hash $n$ keys into a table of size $m$, where $n \leq m$, the expected number of collisions ...

Avalanche effect in cryptography refersLarge changes in cipher text when the keyword is changed minimallyLarge changes in cipher text when the plain text is changedLarge ...

In a columnar transportation cipher, the plain text is “the tomato is a plant in the night shade family”, keyword is “$\text{TOMATO}$”. The cipher text is$\text{”TINESAX ...

The Data Encryption Standard (DES) has a function consists of four steps. Which of the following is correct order of these four steps?An expansion permutation, S b...

A math class has 25 students. Assuming that all of the students were born in the firsthalf of the year—between January 1st and June 30th— what is the probability that atl...