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Transposition cipher
This document discusses transposition ciphers, which is a method of encryption where the positions of plaintext units are shifted according to a regular system to produce the ciphertext. The order of units is changed by using a bijective function on the characters' positions to encrypt and an inverse function to decrypt. Some common transposition ciphers mentioned include the rail fence cipher, route cipher, columnar transposition, double transposition, and Myszkowski transposition. Cryptanalysis techniques for transposition ciphers involve analyzing letter frequencies and determining the number of columns. One-time pads are also briefly discussed, which use random bit strings for encryption but have limitations such as requiring the key to be securely transported.
In this document
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Introduces transposition cipher in cryptography and the related speaker.
Defines important keywords like cryptography, encryption, decryption, and ciphers.
Explains how transposition ciphers rearrange plaintext positions and describe their encryption and decryption mechanics.
Lists various types of transposition ciphers including Anagram, Rail Fence, Route, Columnar, Double, and Myszkowski transpositions with examples.
Discusses breaking columnar transposition ciphers using frequency analysis and assumptions.
Explains one-time pads, their use in converting plaintext to bit strings, and related disadvantages.
A simple thank you note at the end of the presentation.
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Similar to Transposition cipher
Transposition cipher
- 1. TranspositionTransposition CipherCipher A . AntonyAlex MCA Dr G R D College of Science – CBE Tamil Nadu - India
- 2.
- 3. In cryptography, aTRANSPOSITION CIPHER is a method of encryption by which the positions held by units of plaintext are shifted according to a regular system, soshifted according to a regular system, so that the ciphertext constitutes a permutation of the plaintext.
- 4. The order ofthe units is changed. Mathematically a bijective function is used on the characters' positions to encrypt and an inverse function to decrypt.and an inverse function to decrypt.
- 5. Most Common GameMostCommon Game -- AnagramAnagram TSPSH ALSIS EASAM GIMEE THIS IS A SAMPLE MESSAGE
- 6. Rail Fence cipher Routecipher Columnar transpositionColumnar transposition Double transposition Myszkowski transposition
- 7. Rail Fence cipherRailFence cipher
- 8.
- 9. Columnar transpositionColumnar transposition ZEBRAS "63 2 4 1 5“ EVLNA CDTES EAROF ODEEC WIREE
- 10. Double transpositionDouble transposition STRIPE "564231“ CAEENSOIAE DRLEF WEDRE EVTOC
- 11. Myszkowski transpositionMyszkowski transposition TOMATO 532164 TOMATO 432143 ROFOACDTED SEEEA CWEIV RLENE
- 12. Break Columnar TranspositionBreakColumnar Transposition CipherCipher Cryptanalyst must be aware that he is dealing with cipher Frequency of E,T,A,O,I,N, etcFrequency of E,T,A,O,I,N, etc No of Columns Suspect Assumption
- 13. OneOne--Time PadsTime Pads RandomBit String Converting plain text to bit String ◦ Converting plant text into its ASCII Representation • EXCLUSIVE OR of two string DisadvantageDisadvantage • Key cannot be memorized – written • The amount of data is limited to key available • Sensitivity Can de advantage in computers Using storage devices along with huge data for key transporting.
- 14.