0
with a convertor :P
Wiki User
∙ 11y ago
Add your answer:
Earn +20 pts
Converting plaintext into ciphertext is called what?
Encoding, encipherment or encryption.
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.
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.
Programmed formula that is used to decrypt ciphertext?
An encryption key
What is the encrypted term for plaintext called?
---- == == This is used by the program notepad!
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?
In diffusion, the statistical structure of the plaintext is dissipated into long-range statistics of the ciphertext. This is achieved by having each plaintext digit affect the value of many ciphertext digits, which is equivalent to saying that each ciphertext digit is affected by many plaintext digits. Confusion seeks to make the relationship between the statistics of the ciphertext and the value of the encryption key as complex as possible, again to thwart attempts to discover the key. Thus, even if the attacker can get some handle on the statistics of the ciphertext, the way in which the key was used to produce that ciphertext is so complex as to make it difficult to deduce the key. This is achieved by the use of a complex substitution algorithm.
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.
How do you break the playfair cipher?
The Playfair is susceptible to digraph frequency analysis. Separate the plaintext into digraphs and do a frequency count. Once you've found that, compare the digraph frequency of the ciphertext to the digraph frequency of English and see how it might fit in to the Playfair grid. An intimate understanding of how letters in the grid relate to each other and implications of how the grid is affected by correspondences between the ciphertext and plaintext is critical. I'll try to post a help video on YouTube in the near future.
A cipher is called symmetric if it takes just as much computing time to encrypt a plaintext as it does to decrypt a ciphertext?
A symmetric cipher means that the key is the same for scrambling and unscrambling the data. Symmetric = same
