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What is the cryptography mechanism which hides secret communications within various forms of data? | Steganography Polyinstantiation Codes Signals |
Which of the following encryption methods combines a random value with the plain text to produce the cipher text? | One-time pad Steganography Transposition Elliptic Curve |
Which type of cipher changes the position of the characters in a plain text message? | Transposition Steam Block Substitution |
The Enigma machine, a cryptographic tool introduced in 1944 and used in WW2, encrypted messages by replacing characters for plain text. Which type of cipher does the Enigma machine use? | Transposition Steam Substitution Block |
In a cryptographic system, what properties should the initialization vector have? (Select two.) | Uniform Predictable Short Unpredictable Large |
Which of the following is a form of mathematical attack against the complexity of a cryptosystem’s algorithm? | Brute force attack a birthday attack Analytic Attack Replay attack |
Which form of cryptanalysis focuses on the weaknesses in the supporting computing platform as a means to exploit and defeat encryption?<b>Statistical attack</b> | Analytic Attack Statistical Attack Implementation Attack Cipher text only attack |
In which type of attack does the attacker have access to both the plain text and the resulting cipher text, but does not have the ability to encrypt the plain text? | Chosen cipher Known plaintext Brute Force Chosen plaintext |
Your company produces an encryption device that lets you enter text and receive encrypted text in response. An attacker obtains one of these devices and starts inputting random plain text to see the resulting cipher text. What type of attack is this? | known plaintext Chosen plaintext Brute force Chosen cipher |
When an attacker decrypts an encoded message using a different key than was used during encryption, what type of attack has occurred? | Statistical Analytical Key clustering Reply |
Which of the following best describes a side-channel attack? | The attack exploits weaknesses in a cryptosystem such as an inability to produce random numbers or floating point errors The attack is based on information from the physical implementation of a cryptosystem The attack targets a weakness in the software, protocol, or encryption algorithm The attack targets the key containing a small data set |
Which of the following password attacks adds appendages to known dictionary words? | Dictionary Brute force Hybrid Analytic |
Which of the following attacks will typically take the longest amount of time to complete? | Impersonation attack Replay attack Brute force attack Dictionary attack |
Which type of password attack employs a list of pre-defined passwords that it tries against a logon prompt or a local copy of a security accounts database? | Salami Brute Force Dictionary Asynchronous |
Why are brute force attacks always successful? | They are fast They are platform indipendent They test every possible valid combination They are performed in a distributed parallel processing environment |
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Is the process of encoding a plaintext to cipher text?
encryption – the process of converting plaintext to ciphertext (occasionally you may see it called 'encipherment') decryption – the process of reverting ciphertext to plaintext (occasionally 'decipherment').
What type of cipher changes the position of the characters in a plain text message?
In cryptography, a transposition cipher is a method of encryption by which the positions held by units of plaintext (which are commonly characters or groups of characters) are shifted according to a regular system, so that the ciphertext constitutes a permutation of the plaintext.
Which term means a cryptography mechanism that hides secret communications within various forms of data?
Whereas cryptography is the practice of protecting the contents of a message alone, steganography is concerned with concealing the fact that a secret message is being sent and its contents. Steganography includes the concealment of information within computer files.
Which type of Cypher changes the position?
Transposition Ciphers work by changing the position of letters or text in a message. This is a great way to write secret messages.
Which technique added to cryptographic algorithms can change a single character of plaintext into multiple characters of ciphertext?
Applied to encryption
Diffusion means that changing a single character of the input will change many characters of the output.
RelatedWhat is relationship between plaintext and cipher text?
If you can make sense of what is written, then it is in plaintext. Ciphertext, or encrypted text, is a series of randomized letters and numbers which humans cannot make any sense of. An encryption algorithm takes in a plaintext message, runs the algorithm on the plaintext, and produces a ciphertext.
RelatedWhich term is defined as hiding secret communications within various forms of data?
Steganography is the technique of hiding secret data within an ordinary, non-secret, file or message in order to avoid detection; the secret data is then extracted at its destination. ... The word steganography is derived from the Greek words steganos (meaning hidden or covered) and the Greek root graph (meaning to write).
RelatedWhat are different encryption techniques?
The various encryption types. The three major encryption types are DES, AES, and RSA.Dec 4, 2020
RelatedWhich of the following traditional cipher technique uses the pair of keys to encrypt the plain text?
Playfair Cipher
In this scheme, pairs of letters are encrypted, instead of single letters as in the case of simple substitution cipher. In playfair cipher, initially a key table is created. The key table is a 5×5 grid of alphabets that acts as the key for encrypting the plaintext.
RelatedWhat will be the encrypted text corresponding to plain text Sanfoundry?
Explanation: For encrypting a plain text using rail fence cipher we use a table having the number of rows equal to key value as shown below. Then we read along the rows to get the ciphered text. So the ciphered text becomes “SNONRAFUDY”. Sanfoundry Global Education & Learning Series – Data Structures & Algorithms.
RelatedHow do you decrypt an encrypted text?
To decrypt an enciphered message, paste it in the box below, enter the key with which it was encrypted in the Key box at the top, and press the Decrypt button. The decrypted text will be placed in the Plain Text box above.
RelatedWhat is decrypt tool?
Ransomware is a malware that locks your computer or encrypts your files and demands a ransom (money) in exchange. Quick Heal has developed a tool that can help decrypt files encrypted by the following types of ransomware. ... The tool is free and can be used without any hassle.
RelatedWhat are the two basic components of encryption?What are the two basic components of encryption?
An encryption method is formed from two basic components: a cryptographic algorithm and at least one cipher key. While the algorithm describes the encryption method (for example, “move each letter along the order of the alphabet”), the key provide the parameters (“C = Three steps”).
RelatedHow does the symmetric algorithm of block encryption work?How does the symmetric algorithm of block encryption work?
The symmetric algorithm of a block encryption works at the bit level. The plaintext is broken down into blocks of 64 bits, which are then individually encrypted with a 64-bit key. In this way, the 64-bit plaintext is translated into 64-bit secret text.
RelatedHow many key combinations can be mapped in encryption?How many key combinations can be mapped in encryption?
The Advanced Encryption Standard ( AES ), for example, offers the possibility to select key lengths of either 128, 192, or 256 bits. The key length of this method is accordingly large, as a result. Even with 128-bit encryption, 2 128 conditions can be mapped. These correspond to more than 240 sextillion possible key combinations.
RelatedWhat is simple encryption and how does it work?What is simple encryption and how does it work?
In ancient times, simple encryption methods were used which were primarily restricted to coding the information that was to be protected. Individual characters of plaintext, words, or entire sentences within the message are rearranged (transposition) or replaced by alternative character combinations (substitution).