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with a convertor :P

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Q: How do you convert plaintext to ciphertext?
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Converting plaintext into ciphertext is called what?

Encoding, encipherment or encryption.


What is Plaintext?

Plaintext is easily readable or, to be more accurate, decrypted/unencrypted text. This is opposed to ciphertext, which is encrypted. If you used an encryption algorithm to encode your message of "Hello, there" to "4hgu28fhdjf83291". The plaintext form would be: "Hello, there" The ciphertext form would be: "4hgu28fhdjf83291"


Could the ciphertext JOHN A1 be a valid ciphertext for the plaintext JOSE C1?

Of course it COULD be. Even a simple substitution cipher could be used to generate the given ciphertext from the given plaintext since they both have the same number of characters. Whether or not it actually IS a valid ciphertext depends on the algorithm used to encrypt it.


What is a CBC residue?

The last ciphertext block of the previous record. It is is sometimes xor'd with the plaintext of the next record to ensure duplicate plaintext does not encrypt to duplicate cipher text.


What is the difference between diffusion and confusion?

Diffusion is the movement of particles from an area of high concentration to an area of low concentration, while confusion refers to a lack of clarity or understanding in a situation. In cryptography, confusion is associated with creating complexity and making the relationship between the plaintext and ciphertext obscure, while diffusion refers to dispersing the influence of individual plaintext elements over multiple ciphertext elements to enhance security.


Why are there 26 possible mappings of a plaintext alphabet to ciphertext alphabet?

because 26 the number of English character


Which kind of attack on cryptosystems involves using a collection of pre-identified terms?

The kind of attack you are referring to is known as a known-plaintext attack. In this type of attack, the attacker has access to both the plaintext and the corresponding ciphertext, and the goal is to deduce the encryption key or algorithm used. By analyzing the patterns or relationships between the known plaintext and ciphertext, the attacker can potentially uncover vulnerabilities in the cryptosystem.


What is a secure encryption?

Encryption is a process of translating a message from the Plaintext, into an encoded message, called the Ciphertext. This is usually accomplished using a secret Encryption Key and a cryptographic Cipher. ss of translating a message, called the Plaintext, into an encoded message, called the Ciphertext. This is usually accomplished using a secret Encryption Key and a cryptographic Cipher.


Does a substitution need to be permutation of plain text symbols?

No. A substitution can be to an entirely different alphabet. (As an example, read the Arthur Conan Doyle Sherlock Holmes "Case of the Dancing men.") One plaintext symbol can convert to several ciphertext symbols, or vice versa. For example, Morse code is a form of substitution of alphabetic letters to dots and dashes. Two plaintext characters could map the same ciphertext character as long as the recipient could distinguish between the two.


What is key of hill cipher if we have plain text and cipher text?

Assume Plaintext = P, Ciphertext = C, and the Key = K. C = P * K Therefore, multiply both sides by the inverse of P and you will get: C * P^(-1) = K Or, (ciphertext) * (inverse plaintext) = key If the size of the key is known as well, then use that same size when creating P and C matrices.


What does left shift in CBC mean?

In CBC mode, left shift refers to the operation of shifting the previous block of ciphertext to the left to combine it with the current plaintext block before encryption. This helps to add diffusion and provides additional security by preventing patterns in the plaintext from being easily identified in the ciphertext.


Which is the primary cryptographical techniques employed when producing ciphertext?

The primary cryptographical techniques employed when producing ciphertext are:HashingSymmetric encryptionAsymmetric encryption