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Transposition cipher - Wikipedia Transposition cipher Step-by-step process for the double columnar transposition cipher In cryptography, a transposition cipher (also known as a permutation cipher) is a method of encryption which scrambles the positions of characters (transposition) without changing the characters themselves
Capture the flag (cybersecurity) - Wikipedia Capture the flag (cybersecurity) A team competing in the CTF competition at DEF CON 17 In computer security, Capture the Flag (CTF) is an exercise in which participants attempt to find text strings, called "flags", which are secretly hidden in purposefully vulnerable programs or websites They can be used for both competitive or educational
Outline of cryptography - Wikipedia The following outline is provided as an overview of and topical guide to cryptography: Cryptography (or cryptology) – practice and study of hiding information Modern cryptography intersects the disciplines of mathematics, computer science, and engineering Applications of cryptography include ATM cards, computer passwords, and electronic commerce
Block cipher mode of operation - Wikipedia Six common block cipher modes of operation for encrypting In cryptography, a block cipher mode of operation is an algorithm that uses a block cipher to provide information security such as confidentiality or authenticity [1] A block cipher by itself is only suitable for the secure cryptographic transformation (encryption or decryption) of one fixed-length group of bits called a block [2] A
Cryptography - Wikipedia Cryptography, or cryptology (from Ancient Greek: κρυπτός, romanized: kryptós "hidden, secret"; and γράφειν graphein, "to write", or -λογία -logia, "study", respectively [1]), is the practice and study of techniques for secure communication in the presence of adversarial behavior [2]
Cryptogram - Wikipedia Example cryptogram When decoded it reads: "Style and structure are the essence of a book; great ideas are hogwash " -Vladimir Nabokov A cryptogram is a type of puzzle that consists of a short piece of encrypted text [1] Generally the cipher used to encrypt the text is simple enough that the cryptogram can be solved by hand Substitution ciphers where each letter is replaced by a different
Caesar cipher - Wikipedia In cryptography, a Caesar cipher, also known as Caesar's cipher, the shift cipher, Caesar's code, or Caesar shift, is one of the simplest and most widely known encryption techniques It is a type of substitution cipher in which each letter in the plaintext is replaced by a letter some fixed number of positions down the alphabet
Classical cipher - Wikipedia Classical cipher In cryptography, a classical cipher is a type of cipher that was used historically but for the most part, has fallen into disuse In contrast to modern cryptographic algorithms, most classical ciphers can be practically computed and solved by hand However, they are also usually very simple to break with modern technology
XOR cipher - Wikipedia In cryptography, the simple XOR cipher is a type of additive cipher, [1] an encryption algorithm that operates according to the principles: A 0 = A, A A = 0, A B = B A, (A B) C = A (B C), (B A) A = B 0 = B For example where denotes the exclusive disjunction (XOR) operation [2] This operation is sometimes called modulus 2 addition (or subtraction, which is identical) [3] With this logic, a