University:
California State University, Los Angeles
Course:
CS4780 | Cryptography and Information Security
Academic year:

2023
Views:

304

Pages:

4
Author:

Julie E. J.

Nag-faro Cipher Ist construct a 5x5 matrix Word taken- MONARCHY (key) Rules 1. substitution by filler alphabet... 49: PT → balloon - it stays single 60, add filler alphabet then, with. ist l. balloon will be ba ix lo on 2. Two plaintext letters fall in the same row, then each replaced by letter to the right. &g. PT ar {dight of a = 3. Two plaintext letters fall in the same Coloumn, then substitute with the letter beneath it PT mu 4. PT HS →BP (Intersection) feront 10/0 PT-ca IM OD JM Hill cipher multi letter cepher developed by Hill C = KP mod 26 ↓ Cipher key plaintext tent PT PAY (corresponding no. of each letter is taken) mod 26. LNS = Polyalphabetic ciphers Same alphabet is substituted by different alphabets in the message 1. Vigenere Ciphes A table is constructed. Key Inte-26/486 zab Take the word Key: deceptive PT: wearedise 80, Intersection of a and w is Z no of d3 no of w22 then adding these we got or which is z CT ZICVTW Vernam Cipher Ci = i ki One-Time Pad - used in Unconditionally Secure system. - Hard to break the One time Pad. Transposition techniques 1. rail fence technique PT- meet me after the toga party with depth & as rail fence