substitution cipher


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substitution cipher

[‚səb·stə′tü·shən ‚sī·fər]
(communications)
A cipher in which the characters of the original message are replaced by other characters according to a key.
References in periodicals archive ?
The Alien Alphabet used in Futurama is a straight up substitution cipher. This is the easiest to use for practical communication and letters, as it has a full set of numbers and all the necessary pronunciations.
substitution cipher and transportation cipher (Forouzan, 2006).
R presents two layer securities, which includes both transposition and substitution cipher. The first stage processes the audio signal with transposition cipher.
The data in the database are encrypted using substitution cipher. In order to mitigate the frequency analysis attack in the database fictitious transaction are inserted into the original database.
The technique divides the plaintext to encrypt each pair of letters (digraphs) separately, instead of single letters as in the simple substitution cipher or rather than the more complex Vigenere cipher systems.
Clelland [16] used a substitution cipher to encode characters to DNA strands.
If you and a friend want to exchange coded messages, you could send a backwards message or use a rail fence cipher or a substitution cipher.
have used a substitution cipher for plaintext encoding where base triplet is assigned to each letter of the alphabet, numeral and special characters and demonstrated a steganographic approach by hiding secret messages encoded as DNA strands among multitude of random DNA [14].
The main idea is that the plain text is encrypted with a substitution cipher using a secret random key.
Our students enjoyed trying to solve a simple substitution cipher using frequency tables.
About 2,000 years ago, transposition ciphers had made the barest appearance and Julius Caesar carried on correspondence in a very simple substitution cipher. About 1,000 years ago, simple substitution ciphers were familiar enough for their weaknesses to be understood and for people to begin exploring more complex systems intended to counter those weaknesses.
This third programme, Le Chiffre Indechiffrable, traces the search for a new system of encryption, following the cracking of the mono-alphabetic substitution cipher.