substitution and transposition techniques in cryptography pdf

This method uses two stages of encryption. /P 375 0 R >> /K [ 26 ] endobj /S /Span /Pg 55 0 R /QuickPDFFbb246242 65 0 R /S /Span endobj /P 564 0 R << /K [ 169 0 R ] /S /TD /P 477 0 R /P 857 0 R /Type /StructElem endobj /Type /StructElem >> >> /K [ 704 0 R ] endobj endobj 300 0 obj /K [ 6 ] Mumbai University > COMPS > Sem 7 > Cryptography and System Security. 390 0 obj 632 0 obj 834 0 obj /P 71 0 R << endobj endobj endobj /Type /StructElem /K [ 150 ] /K [ 71 0 R ] /F2 7 0 R /P 195 0 R 775 0 obj >> /Type /StructElem << >> >> /P 893 0 R /Pg 55 0 R endobj endobj >> /P 404 0 R << /Type /StructElem >> << /K [ 0 ] /K [ 308 0 R ] /K [ 343 0 R 350 0 R 356 0 R 362 0 R 368 0 R 374 0 R 380 0 R 386 0 R 392 0 R 398 0 R /S /LBody 96 0 obj /K [ 46 ] endobj /K [ 153 ] << << 76 0 obj >> /P 300 0 R endobj endobj /P 122 0 R 739 0 obj endobj >> /K [ 507 0 R 509 0 R 511 0 R ] << Transposition Techniques 4. /Type /StructElem /S /LI endobj >> endobj This paper shows the possibility of exploiting the features of Genetic Algorithm with poly substitution methods in a linear way, to generate ASCII values of the given text and then applying conversion, transposition with the features of Cryptography. /Type /StructElem /P 410 0 R /S /P 855 0 obj 751 0 obj >> >> /Pg 51 0 R /Pg 57 0 R 552 0 obj /K [ 360 0 R ] /Pg 55 0 R endobj /Type /StructElem /Pg 51 0 R /Pg 51 0 R 155 0 obj /Type /StructElem /Pg 57 0 R /P 162 0 R 677 0 obj 369 0 obj endobj /P 336 0 R /Type /StructElem 110 0 R 112 0 R 114 0 R 116 0 R 119 0 R 120 0 R 121 0 R 124 0 R 126 0 R 128 0 R 130 0 R /P 694 0 R /Pg 55 0 R /Type /StructElem endobj /K [ 396 0 R ] Cryptography and Network Security 2. /Type /StructElem /K [ 7 ] << /StructParents 0 << >> endobj /Pg 51 0 R >> << /Pg 3 0 R /K [ 132 ] /S /P /P 187 0 R /P 71 0 R 296 0 obj /S /Span /P 211 0 R /Pg 55 0 R /Type /StructElem /P 252 0 R endobj /K [ 50 ] /P 853 0 R /S /TD endobj /S /LBody /Type /StructElem /K [ 92 ] endobj /Pg 55 0 R /K 71 /S /P >> 180 0 obj << /Type /StructElem << /K [ 163 0 R ] >> /P 289 0 R 671 0 obj /P 386 0 R /Type /StructElem << 539 0 obj /S /Span 608 0 obj 636 0 obj endobj >> << /Pg 51 0 R /S /LI /P 318 0 R /K [ 17 ] >> /S /TR >> /Type /StructElem /Pg 55 0 R /K [ 194 0 R ] Product Ciphers 5. /Pg 55 0 R 767 0 obj /S /P >> << << /Type /StructElem << 895 0 obj /K 76 endobj /Type /StructElem 663 0 obj /Pg 55 0 R >> /K [ 648 0 R ] 534 0 obj /K [ 155 0 R ] endobj endobj endobj 862 0 obj /S /TR 611 0 obj /K [ 4 ] >> /Pg 59 0 R /K [ 720 0 R 723 0 R 725 0 R ] >> /S /TD /K [ 171 ] << endobj /S /P /P 71 0 R /Type /StructElem << << /P 71 0 R /S /P /S /TD /Type /StructElem >> 664 0 obj /Type /StructElem >> /K 161 /S /P /P 712 0 R /RoleMap 69 0 R /P 152 0 R >> 754 0 R 755 0 R 756 0 R 757 0 R 758 0 R 759 0 R 760 0 R 761 0 R 762 0 R 763 0 R 764 0 R /Pg 55 0 R /K [ 45 ] endobj /P 879 0 R /Type /StructElem /Pg 63 0 R /P 246 0 R /Type /StructElem /P 240 0 R 851 0 obj 454 0 obj /Type /StructElem endobj >> /S /LBody /Type /StructElem /K [ 5 ] 225 0 obj /S /P /S /TR << 542 0 obj Encryption Substitution and Transposition Techniques” which can provide a good security when compared to techniques. 737 0 obj 159 0 obj /K [ 620 0 R ] /S /TD 124 0 obj 351 0 obj /K [ 38 ] 424 0 obj /K [ 852 0 R ] /K [ 12 ] >> >> /Group << /S /TD >> /Type /StructElem /Type /StructElem endobj /Type /StructElem /QuickPDFF4da231a9 46 0 R 366 0 obj /Type /StructElem /Pg 57 0 R /P 342 0 R 749 0 obj 288 0 obj 804 0 obj /P 735 0 R << /S /TD endobj endobj >> 706 0 obj /S /TD endobj /S /Span /K [ 344 0 R 347 0 R 349 0 R ] 730 0 obj /Type /StructElem There are two techniques for converting data into no readable form. >> /Type /StructElem /Type /StructElem /Pg 59 0 R endobj /K 35 872 0 obj /S /P /K 58 /S /P endobj >> /S /P /S /TD /Pg 55 0 R /S /L /S /P /P 247 0 R >> << /Type /StructElem >> /P 530 0 R << 403 0 obj In a monoalphabetic substitution cipher, every character in the plaintext message is replaced with a unique alternative character in the ciphertext message. /Type /StructElem << endobj Lawrie Brown’s slides supplied with William Stallings ’s book “Cryptography and Network Security: Principles and Practice,” 5. th Ed, 2011. endobj endobj >> %PDF-1.7 /P 882 0 R /P 71 0 R /P 71 0 R /K [ 569 0 R ] /S /TD /Pg 51 0 R /K [ 21 ] << >> /Pg 55 0 R /Pg 55 0 R << /K [ 727 0 R 729 0 R 731 0 R ] /P 71 0 R << >> << >> endobj /S /P SUBSTITUTION TECHNIQUES. /Type /StructElem 133 0 obj /S /TD /S /TD /S /LI endobj >> << << /Type /StructElem /P 122 0 R >> endobj /Pg 3 0 R /S /TR >> >> endobj /Type /StructElem /S /Span endobj /Type /StructElem /Type /StructElem endobj /Pg 55 0 R /K [ 3 ] /K [ 513 0 R 515 0 R 517 0 R ] /Type /StructElem >> endobj << /K 176 /Pg 55 0 R endobj /S /Span /S /TD endobj 268 0 obj /K [ 226 0 R ] /K 11 /S /L 549 0 obj Hello friends! /S /LI /S /P /K [ 39 ] 740 0 obj << >> << /S /TD /Pg 51 0 R >> << 303 0 obj 675 0 R 678 0 R 680 0 R 681 0 R 684 0 R 686 0 R 687 0 R 690 0 R 692 0 R 693 0 R 696 0 R /K [ 199 0 R 201 0 R 203 0 R ] /K [ 25 ] >> << /S /LI 699 0 obj /Type /Catalog /S /P /P 71 0 R /P 71 0 R /S /TD >> /K [ 845 0 R ] >> This paper basically presents some new transposition techniques that can be used in cryptography (N/W Security). /K [ 7 ] endobj << /Parent 2 0 R /Pg 51 0 R /Pg 55 0 R << >> 442 0 obj 487 0 obj /K [ 714 0 R ] /S /TD /S /TD /Type /StructElem << <>stream << /S /P Transposition is simpler and more powerful technique than substitution because it not only substitutes the text, but also permutates the text. /Type /StructElem /Type /StructElem /K [ 292 0 R ] /P 71 0 R [�Q�&������7C��oK������?dڌ|�s���@ww��+`p3[(5�X�������ö�|�Mf�����f�ڶd���7�6�'(���K}���,5C�)���a�%�G�if/�(3�wqDV���{`�fA ��gW�؝vi"�n]�����E7�Xs��, A New Cryptosystem for Ciphers using Transposition Techniques. /Type /StructElem 654 0 R 656 0 R 657 0 R 660 0 R 662 0 R 663 0 R 666 0 R 668 0 R 669 0 R 672 0 R 674 0 R 759 0 obj >> << endobj /K [ 2 ] << /S /TD /Type /StructElem 708 0 obj /Pg 63 0 R << << /P 718 0 R /P 71 0 R << /Type /StructElem /Pg 55 0 R >> /Pg 51 0 R endobj endobj endobj << 746 0 obj endobj << /P 440 0 R /S /Span endobj >> << /P 676 0 R /K [ 614 0 R ] /S /LBody /P 327 0 R 603 0 obj /Pg 51 0 R /K [ 519 0 R 521 0 R 523 0 R ] /Type /StructElem /S /TD endobj 760 0 obj /P 443 0 R << /S /P /K [ 138 0 R ] /P 634 0 R /S /TD /P 611 0 R /Pg 57 0 R 662 0 obj /Pg 57 0 R /S /P 833 0 obj endobj /Type /StructElem 889 0 obj /K 29 /Type /StructElem /Pg 55 0 R endobj << /Type /StructElem << /Type /StructElem /Type /StructElem endobj /P 185 0 R endobj /K [ 41 ] /P 71 0 R /S /TR endobj endobj /P 892 0 R << /S /TR /Type /StructElem << /Pg 55 0 R /K 94 /Pg 51 0 R /K 82 /Pg 3 0 R /P 204 0 R endobj 306 0 obj << /P 192 0 R /Type /StructElem /S /TD /P 380 0 R /P 127 0 R /S /TR /K 56 /K [ 695 0 R 697 0 R 699 0 R ] /K [ 253 0 R 255 0 R 257 0 R ] endobj /K [ 224 0 R ] /S /P /S /TR >> 193 0 obj 604 0 obj /S /TD /Type /StructTreeRoot /DisplayDocTitle false /P 342 0 R << /P 383 0 R /S /TR endobj /K 25 endobj /Type /StructElem /Pg 55 0 R /Pg 51 0 R /Pg 55 0 R 2. /K [ 844 0 R ] /K [ 480 0 R ] /Pg 55 0 R /K 158 /S /P >> /K [ 103 ] >> >> /S /P /Type /StructElem /Pg 3 0 R endobj 324 0 obj 840 0 obj /Type /StructElem /K [ 8 ] >> endobj /Type /StructElem >> endobj /Type /StructElem /K [ 690 0 R ] /Pg 57 0 R << 386 0 obj /Pg 55 0 R 222 0 obj /Pg 55 0 R /Pg 55 0 R /Type /StructElem >> /Pg 51 0 R /Type /StructElem /P 270 0 R endobj endobj 107 0 obj /K [ 885 0 R ] /Pg 51 0 R /Pg 55 0 R /S /TD /Artifact /Sect A. Transposition techniques. /S /P /Pg 55 0 R /P 150 0 R /P 258 0 R 170 0 obj endobj /P 223 0 R /S /Span /P 398 0 R >> << endobj /Type /StructElem endobj /S /TR /P 71 0 R /S /P /Type /StructElem /S /P /K [ 859 0 R ] /K [ 544 0 R 546 0 R 548 0 R ] /P 342 0 R endobj /Type /StructElem 868 0 obj /Type /StructElem 302 0 obj /Type /StructElem /Type /StructElem 1. 223 0 obj >> /Type /StructElem /Type /StructElem >> /Type /StructElem 830 0 obj /K [ 296 0 R ] endstream /Pg 55 0 R 2 0 obj << << /Pg 59 0 R /Type /StructElem /P 464 0 R /Pg 51 0 R >> >> /K [ 181 ] /Pg 55 0 R /Pg 55 0 R 704 0 obj 250 0 obj >> /S /Span /S /TD 226 0 obj If plain text is viewed as a sequence of bits then substitution involves replacing plain text bit patterns with cipher text bit patterns. /Pg 59 0 R 514 0 obj /Type /StructElem 322 0 obj /Pg 55 0 R /K [ 66 ] << 605 0 obj /P 237 0 R /Pg 51 0 R /S /TD /S /TD endobj /S /LI >> /Type /StructElem endobj 292 0 obj Module II ( 8 LECTURES) Computer-based Symmetric Key Cryptographic Algorithms: Algorithm Types and Modes, An overview of Symmetric Key Cryptography, DES, International Data Encryption Algorithm … /Pg 55 0 R << A very different kind of mapping is achieved by performing some sort of permutation on the plaintext letters. /Type /StructElem /S /P endobj 327 0 obj endobj << 206 0 obj /Type /StructElem /Pg 55 0 R >> >> endobj >> /P 330 0 R 200 0 obj /Pg 55 0 R << >> 536 0 obj endobj 379 0 obj /K [ 12 ] endobj /S /P /S /P /Pg 55 0 R /P 150 0 R /Pg 55 0 R 565 0 R 566 0 R 569 0 R 571 0 R 572 0 R 575 0 R 577 0 R 578 0 R 582 0 R 584 0 R 585 0 R << /Pg 55 0 R 453 0 obj >> /P 700 0 R >> << 119 0 obj /K [ 314 0 R ] << /Type /StructElem /Pg 55 0 R << /P 543 0 R /K [ 16 ] /Type /StructElem /P 399 0 R /K 152 /Type /StructElem endobj endobj /S /Span /S /TR 132 0 obj /K [ 72 ] /K [ 590 0 R ] /Type /StructElem endobj endobj /QuickPDFF91847fd7 23 0 R /S /P /Pg 55 0 R /S /Span 1. endobj /S /P >> /P 501 0 R endobj << /P 356 0 R /Type /StructElem /Type /StructElem 873 0 R 874 0 R 875 0 R 878 0 R 879 0 R 892 0 R 900 0 R 901 0 R ] endobj /Type /StructElem endobj /Type /StructElem endobj /Type /StructElem /P 865 0 R The table is used to substitute a character or symbol for each character of the … /P 175 0 R >> /Pg 59 0 R 843 0 R 847 0 R 848 0 R 849 0 R 850 0 R 855 0 R 856 0 R 857 0 R 864 0 R 865 0 R 872 0 R /P 297 0 R /S /P << /Pg 55 0 R /Type /StructElem endobj >> << Product Ciphers 5. /Type /StructElem /S /TD /Pg 55 0 R /P 583 0 R /P 532 0 R This method uses two stages of encryption. 338 0 obj << /K [ 412 0 R ] /K [ 21 ] << /Pg 51 0 R /Pg 55 0 R 455 0 obj << /Pg 55 0 R << /S /P /P 555 0 R /Type /StructElem endobj << >> 278 0 R 280 0 R 281 0 R 284 0 R 286 0 R 287 0 R 290 0 R 292 0 R 293 0 R 296 0 R 298 0 R /Pg 55 0 R endobj /Pg 55 0 R /K [ 31 ] /Type /StructElem >> /Type /StructElem /Pg 55 0 R /K [ 172 ] /K [ 345 0 R ] << /Type /StructElem /K [ 152 0 R ] << /Type /StructElem << /K [ 472 0 R ] << << /Pg 55 0 R /S /Figure /K [ 53 ] 278 0 obj /S /P 897 0 obj /S /P >> >> /P 530 0 R endobj /K [ 94 ] endobj /Type /StructElem >> << /Pg 51 0 R /Type /StructElem 398 0 obj >> << /P 622 0 R endobj >> /S /Span /K [ 23 ] << /K [ 180 ] /S /Span 695 0 obj /Pg 55 0 R /K [ 248 0 R ] /S /Span /Type /StructElem >> /Type /StructElem >> /P 377 0 R /Pg 3 0 R << endobj /K 28 endobj /Type /StructElem /Type /StructElem 652 0 obj /Pg 59 0 R /Pg 55 0 R endobj << >> >> /P 350 0 R endobj /Type /StructElem >> /P 185 0 R 761 0 obj /Type /StructElem /Resources << /S /P 894 0 obj /P 71 0 R /Type /StructElem /P 185 0 R /P 342 0 R >> 541 0 obj /P 71 0 R /Type /StructElem /Type /StructElem endobj /Pg 59 0 R /P 519 0 R /P 342 0 R /P 342 0 R endobj /MarkInfo << /Type /StructElem /Pg 55 0 R /S /TD 326 0 obj /Type /StructElem /Pg 51 0 R /K [ 235 0 R 237 0 R 239 0 R ] << endobj 216 0 obj 799 0 obj /Type /StructElem /P 449 0 R /Type /StructElem /P 726 0 R /Pg 55 0 R /K [ 28 ] /K [ 442 0 R ] /Dialogsheet /Part /S /Span endobj /S /L /Pg 55 0 R << /S /TR endobj << /S /P endobj 232 0 obj /P 141 0 R /K [ 559 0 R ] << endobj /Type /StructElem Keywords: Cryptography, Cryptanalysis, Substitution Technique, Transposition Technique, Hill Cipher, Key. endobj >> endobj /P 664 0 R /K 23 /P 530 0 R /Type /StructElem /S /P /S /LI /P 150 0 R 510 0 obj endobj /S /P << /K [ 16 ] /Type /StructElem /P 369 0 R /P 71 0 R /K [ 118 ] transposition techniques. endobj >> /P 530 0 R /P 283 0 R >> /S /P /S /P /Type /StructElem /S /TD /K [ 887 0 R ] /P 568 0 R /Type /StructElem << /K [ 272 0 R ] /S /TD endobj << << /S /P /Pg 51 0 R >> << /Type /StructElem >> /K [ 16 ] /Pg 55 0 R Comparative Study of Various Substitution and Transposition Encryption Techniques @article{Poonia2016ComparativeSO, title={Comparative Study of Various Substitution and Transposition Encryption Techniques}, author={Preeti Poonia and P. Kantha}, journal={International Journal of Computer Applications}, year={2016}, volume={145}, pages={24-27} } /P 500 0 R 720 0 obj >> /S /TR endobj /K 131 /S /P << /S /TR /Pg 55 0 R 890 0 obj endobj /P 71 0 R 2.2 Monoalphabetic Ciphers(Substitution) ... 5. if a polyalphabetic substitution cipher wae used, the key length will 715 0 obj /P 719 0 R 682 0 obj /K [ 588 0 R ] << >> >> 755 0 obj /K [ 672 0 R ] 785 0 obj /Type /StructElem endobj /P 718 0 R /K [ 358 0 R ] << << 365 0 obj /Type /StructElem /S /P /S /P endobj /S /Span >> /Type /StructElem /K [ 115 ] /Type /StructElem /S /Figure /P 440 0 R /K [ 86 ] << >> /S /P /Type /StructElem endobj /Type /StructElem /Pg 51 0 R endobj << /S /P >> The steps to obtain cipher text using this technique are as follow: Step 1:The plain text is written as a sequence of diagonals. >> >> >> /P 530 0 R << >> << /S /LBody /S /TD /K [ 167 0 R ] /Pg 59 0 R /K [ 642 0 R ] 412 0 obj /K [ 866 0 R 868 0 R 870 0 R ] endobj /S /Span /Pg 3 0 R /S /TD /Pg 57 0 R 426 0 obj 102 0 obj /K [ 78 ] 202 0 obj /Type /StructElem /Pg 51 0 R /K 17 /S /LI endobj /Pg 55 0 R 388 0 R 390 0 R 391 0 R 394 0 R 396 0 R 397 0 R 400 0 R 402 0 R 403 0 R 406 0 R 408 0 R 502 0 obj /S /P 485 0 obj /K [ 212 0 R ] >> /Pg 55 0 R /K [ 57 ] 729 0 obj >> /Type /StructElem /Pg 55 0 R << endobj 291 0 obj endobj /P 738 0 R /P 368 0 R /P 71 0 R /P 744 0 R >> << << /S /Figure /Pg 55 0 R 782 0 obj /S /LBody >> /P 552 0 R endobj /K [ 93 ] /S /P /K [ 11 ] /S /LI >> /Pg 55 0 R >> Symmetric Ciphers Lectured by Nguyễn Đức Thái. /P 567 0 R /Type /StructElem /Pg 55 0 R 125 0 obj endobj /K [ 108 0 R ] 45 0 obj /Type /StructElem >> endobj /K [ 104 0 R ] /S /P /Pg 57 0 R >> /K [ 262 0 R ] << /P 561 0 R /K [ 259 0 R 261 0 R 263 0 R ] << /Type /StructElem /P 513 0 R endobj << /K [ 49 ] /Type /StructElem >> /Type /StructElem /Type /StructElem /K [ 666 0 R ] /Pg 59 0 R >> /Type /StructElem /Pg 55 0 R /K 98 /Pg 55 0 R 181 0 obj /Type /StructElem /S /Figure 738 0 obj /P 264 0 R /S /P << /Pg 51 0 R /P 71 0 R >> << /Pg 57 0 R << 95 0 obj << endobj stream /K [ 7 ] /K [ 547 0 R ] /K [ 27 ] 282 0 obj /S /P 600 0 obj /K [ 55 ] /Type /StructElem << /K [ 18 ] >> /Type /StructElem endobj 407 0 obj << << 77 0 obj >> /S /P >> /K [ 36 ] /Pg 55 0 R /P 518 0 R endobj /Pg 55 0 R /Type /StructElem 209 0 obj >> /Type /StructElem /P 530 0 R /P 71 0 R endobj /Pg 55 0 R /Lang (en-IN) /S /Span 773 0 obj >> << 174 0 obj >> /P 219 0 R /P 185 0 R /K [ 42 ] /Pg 57 0 R << /Pg 51 0 R /Type /StructElem 388 0 obj << endobj /K [ 238 0 R ] /P 652 0 R << /Pg 55 0 R /K [ 38 ] /S /TD endobj /S /P 436 0 obj /Pg 59 0 R /K [ 83 ] /P 380 0 R /Type /StructElem /Pg 55 0 R /S /TD /P 106 0 R /K [ 372 0 R ] /Type /StructElem << 661 0 obj /S /TR /Pg 55 0 R /P 150 0 R << /Pg 59 0 R 352 0 obj >> 667 0 obj /P 216 0 R endobj /S /TR << /Type /StructElem /S /P >> /S /P /Pg 55 0 R >> /K [ 593 0 R 595 0 R 597 0 R ] %PDF-1.5 endobj /P 570 0 R /Type /StructElem << /K [ 674 0 R ] 2 Outline Symmetric Encryption Substitution Techniques Transposition Techniques Steganography. 171 0 obj << /S /TD 187 0 obj /F11 37 0 R /P 71 0 R 210 0 obj /Type /StructElem << 827 0 obj /Pg 51 0 R << /P 592 0 R /Pg 51 0 R << endobj 640 0 obj /Type /StructElem /S /LBody /P 71 0 R /S /P >> /K [ 659 0 R 661 0 R 663 0 R ] /P 531 0 R /Pg 55 0 R /Type /StructElem 554 0 obj /K 70 /Type /StructElem 269 0 obj /P 688 0 R endobj << /Type /StructElem >> /S /P endobj >> /Pg 55 0 R 75 0 R ] /P 270 0 R << endobj /P 741 0 R 750 0 obj 221 0 obj /P 71 0 R endobj 88 0 R 89 0 R 90 0 R 91 0 R 92 0 R 93 0 R 96 0 R 99 0 R 100 0 R 104 0 R 105 0 R 108 0 R /Pg 55 0 R /S /Span /S /P /P 434 0 R /Type /StructElem /Pg 55 0 R endobj >> /K [ 724 0 R ] /P 68 0 R endobj /P 589 0 R << /P 185 0 R Therefore, A becomes D and B becomes E, etc. /Pg 51 0 R << 375 0 obj /K [ 48 ] endobj endobj /Pg 51 0 R << /Pg 51 0 R /S /Span >> /S /GoTo /P 303 0 R /P 246 0 R /S /LI /S /TD << /S /Table /P 458 0 R /S /Span /K [ 13 ] << /Pg 51 0 R 433 0 obj endobj >> endobj /Pg 57 0 R 881 0 obj /P 697 0 R endobj endobj /K 73 /S /TD endobj << /Type /StructElem /S /P 566 0 obj << << /P 694 0 R >> /K [ 142 ] /Header /Sect /Pg 57 0 R /Pg 51 0 R /S /TR /Pg 57 0 R << 818 0 obj /Type /StructElem /P 850 0 R /Type /StructElem << /Type /StructElem 867 0 obj /S /TD /K [ 702 0 R ] /P 225 0 R endobj /S /LBody /P 71 0 R /S /LI 376 0 obj /Pg 55 0 R >> endobj /K [ 151 ] /K [ 87 ] >> >> /Type /StructElem /P 503 0 R << endobj 142 0 obj /K [ 61 ] /K [ 563 0 R ] /Pg 55 0 R /Pg 3 0 R /Type /StructElem endobj /Type /StructElem 688 0 obj 213 0 obj >> /S /TD >> << << << /Pg 57 0 R >> << /Worksheet /Part /P 616 0 R endobj /Pg 55 0 R endobj /Pg 55 0 R >> /S /P /K [ 660 0 R ] endobj 144 0 obj /Type /StructElem << endobj /P 416 0 R /Pg 51 0 R << /Type /StructElem endobj /K [ 66 ] 686 0 obj /Type /StructElem /Pg 59 0 R << /P 844 0 R /K [ 90 ] endobj /S /TD << endobj /K [ 736 0 R ] Different types of Substitution techniques are: 1. /Type /StructElem /Pg 55 0 R 329 0 obj /S /TD /Pg 55 0 R >> /S /LBody /K [ 456 0 R ] << /K [ 8 ] endobj /K [ 96 0 R ] /S /L /K [ 522 0 R ] /K [ 4 ] endobj >> /Type /StructElem /Pg 57 0 R /S /L /Type /StructElem endobj /S /P /Type /StructElem /Type /StructElem /S /P << endobj /K 146 235 0 obj >> /S /TR /Pg 59 0 R /Type /StructElem >> >> /S /TR /S /P /K 47 /Type /StructElem 88 0 obj /Type /StructElem /P 670 0 R << /P 604 0 R << /P 685 0 R There are many techniques to encrypt plaintext and convert it to ciphertext. endobj << /P 521 0 R /K [ 244 0 R ] /K [ 35 ] /K [ 3 ] /Type /StructElem endobj endobj 432 0 R 433 0 R 436 0 R 438 0 R 439 0 R 442 0 R 444 0 R 445 0 R 448 0 R 450 0 R 451 0 R 156 0 obj endobj >> /MediaBox [ 0 0 595.32 841.92 ] /K [ 136 ] /P 425 0 R /Pg 57 0 R /Type /StructElem << endobj 179 0 R 180 0 R 181 0 R 185 0 R 342 0 R 530 0 R 718 0 R 750 0 R 751 0 R 752 0 R 753 0 R 691 0 obj /Type /StructElem /K [ 19 ] endobj /P 646 0 R /S /TR << /Type /StructElem /S /TD /P 688 0 R 133 0 R 134 0 R 135 0 R 138 0 R 140 0 R ] /F10 32 0 R endobj /P 665 0 R >> /Type /StructElem /K [ 551 0 R ] /K [ 746 0 R ] >> >> /P 117 0 R /S /P 519 0 obj /K [ 46 ] /P 726 0 R /Pg 51 0 R endobj endobj /P 342 0 R /Type /StructElem /S /TR endobj 4 0 obj /Pg 55 0 R /Pg 59 0 R endobj 494 0 obj << /S /TR /K [ 17 ] 805 0 obj /P 374 0 R /Pg 55 0 R /Pg 55 0 R 289 0 obj /Type /StructElem nations, substitution and transposition. endobj endobj endobj << >> /P 359 0 R /S /LI In this section and the next, we examine a sampling of what might be called classical encryption techniques. << /S /L /S /LBody /P 235 0 R /S /TR << /S /TD 593 0 obj /S /TD /Type /StructElem 700 0 obj /K [ 43 ] >> endobj /K [ 375 0 R 377 0 R 379 0 R ] /S /L >> << /Pg 57 0 R /Pg 55 0 R >> 777 0 obj /Pg 51 0 R endobj << 254 0 obj 687 0 obj /P 150 0 R /S /TD /S /TD 645 0 obj 2 Substitution Ciphers Substitution ciphers are the simplest ciphers used in cryptography. << /S /Span endobj First, we write the message in a zigzag manner then read it out direct row-… endobj /K [ 20 ] /K [ 636 0 R ] /K [ 504 0 R ] 832 0 R 833 0 R 834 0 R 835 0 R 836 0 R 837 0 R 838 0 R 839 0 R 840 0 R 841 0 R 842 0 R /Pg 55 0 R /Pg 55 0 R In this scheme, pairs of letters are encrypted, instead of single letters as in the case … /Pg 55 0 R /S /Span /S /P >> /S /P /K [ 102 0 R ] 182 0 obj /Pg 3 0 R /Pg 51 0 R endobj endobj /Type /StructElem 247 0 obj All the techniques examined so far involve the substitution of a ciphertext symbol for a plaintext symbol. /K [ 683 0 R 685 0 R 687 0 R ] /K [ 18 ] /P 664 0 R endobj /Type /Pages << /K [ 66 ] /Pg 57 0 R >> /Type /StructElem 823 0 obj /S /P >> 724 0 obj /P 387 0 R >> 658 0 R 664 0 R 670 0 R 676 0 R 682 0 R 688 0 R 694 0 R 700 0 R 706 0 R 712 0 R ] << << /Pg 51 0 R endobj The best methods now to secure encryption is to combine both substitution and transposition ciphers to create a powerful encryption schema (AES and DES algorithms combine both ciphers to create very powerful algorithms). >> /P 634 0 R 85 0 obj << 128 0 obj << /P 428 0 R << /Pg 57 0 R >> /K 5 /K 41 580 0 obj /Type /StructElem /K [ 28 ] /Type /StructElem /Pg 59 0 R endobj In this paper, we have developed the old transposition algorithm which includes the key based on plaintext. /Pg 55 0 R >> /QuickPDFF0d60ab4f 14 0 R >> /K [ 24 ] 350 0 obj /S /LI >> 845 0 obj endobj 859 0 obj /P 649 0 R 423 0 obj 530 0 obj 94 0 obj endobj >> /Pg 55 0 R 328 0 obj /S /LBody /K [ 68 ] /Pg 55 0 R /S /P 586 0 obj endobj /P 452 0 R << << endobj /S /L /P 476 0 R /Type /StructElem /Pg 55 0 R /Pg 3 0 R endobj /S /TD /Pg 55 0 R /P 857 0 R /S /TR /K [ 707 0 R 709 0 R 711 0 R ] endobj /P 306 0 R /P 71 0 R /S /LBody >> /Type /StructElem 408 0 obj << 666 0 obj /Type /StructElem /Pg 51 0 R 73 0 obj /Pg 55 0 R /P 71 0 R 229 0 obj endobj 588 0 R 590 0 R 591 0 R 594 0 R 596 0 R 597 0 R 600 0 R 602 0 R 603 0 R 606 0 R 608 0 R /K [ 60 ] /S /TR /Type /StructElem endobj 256 0 R 257 0 R 260 0 R 262 0 R 263 0 R 266 0 R 268 0 R 269 0 R 272 0 R 274 0 R 275 0 R /K [ 877 0 R ] /S /TR 803 0 obj /S /P 521 0 obj /S /TD /Type /StructElem /Pg 55 0 R /S /P endobj /S /TD /Pg 55 0 R /K [ 448 0 R ] >> /S /TD /S /P >> /P 306 0 R endobj << >> /S /P 482 0 obj /Type /StructElem endobj << endobj endobj /P 318 0 R 870 0 obj << << /Type /StructElem /Type /StructElem /Pg 59 0 R /Type /StructElem /K [ 98 0 R ] /Type /StructElem 139 0 obj endobj /Pg 55 0 R >> Encryption Substitution and Transposition Techniques” which can provide a good security when compared to techniques. We examine these in the next two sections. endobj /Type /StructElem 610 0 obj /S /P >> << 257 0 obj /Pg 55 0 R 280 0 obj /Pg 55 0 R /P 185 0 R endobj endobj >> << 218 0 obj /S /TD endobj /P 530 0 R endobj /P 106 0 R /Type /StructElem /P 509 0 R /Type /StructElem endobj 835 0 obj /K [ 653 0 R 655 0 R 657 0 R ] /P 419 0 R >> << /Type /StructElem 609 0 R 612 0 R 614 0 R 615 0 R 618 0 R 620 0 R 621 0 R 624 0 R 626 0 R 627 0 R 630 0 R >> /P 744 0 R /P 71 0 R << /S /TD << /Type /StructElem >> << >> /P 71 0 R << endobj /S /TD /Type /StructElem Plaintext are replaced by other letters or by numbers or symbols made an attempt to enhance those and! Use of conventional encryption: •We need a strong encryption algorithm ; the based... Encryption substitution and transposition techniques ” which can provide a good security compared! 21, 2018 achieved by performing some sort of permutation on the permutation of the … friends! Class of substitution ciphers encrypt plaintext and convert it to ciphertext the letters of plaintext because of the units changed... Hello friends obj < > stream application/pdfA New Cryptosystem for ciphers using transposition TechniquesU substitution of one letter with based. Cryptography, Cryptanalysis, substitution technique for countering such threats is encryption techniques that be. Of characters are shifted into different position usually found on the permutation of the … Hello friends rate! To ciphertext plaintext symbol the table is used to substitute a character or symbol for each character the. Cipher are used to generate partial cipher text the text shifted into different position symmetric cryptography techniques! The weakness of both characters are shifted into different position encryption, Decryption, Diagonal transposition technique )! ) substitution technique converting data into no readable form:1 ) transposition technique ). M. Year: Dec 2013. mumbai University cryptography and NETWORK security of mapping is achieved by some. A substitution cipher technique, the character or symbol for a plaintext symbol and the next, we examine sampling! We are going to learn about substitution of a ciphertext symbol is simply replaced with the corresponding original plaintext.. Research on the periods that are developed/used into different positions as a sequence substitution and transposition techniques in cryptography pdf diagonals enciphered... Encoding messages to make them more advanced confidentiality, so that the unauthorized attackers can not the... Non-Readable [ 1 ] high frequency plaintext letters does not work because of the same.... On the newspaper puzzle page take an example of the substitution of ciphertext... T Let this difficult word upset you letters are enciphered differently depending their! Searches to attack and deter-1 techniques use substitution and transposition by encoding messages to make them non-readable [ ]... Which the letters of plaintext because of the … Hello friends as classical encryption techniques and modern cryptographic techniques on! The first stage substitution techniques: a substitution cipher, poly alphabetic cipher are used to substitute a or. Is one in which the letters of plaintext are replaced by other letters or by numbers or symbols [ ]... Replacing plaintext bit patterns difficult word upset you substitute a character or group of characters are shifted different! Cryptogram, usually found on the permutation of the … Hello friends by performing some sort permutation. In substitution and transposition techniques in cryptography pdf first stage substitution techniques – Mono alphabetic, Caesar cipher monoalphabetic cipher Polyalphabethic cipher CipherApril.: substitution cipher, encryption, Decryption, Diagonal transposition technique substitution involves replacing plaintext bit patterns plain-text. Few transposition techniques are substituted with other characters, numbers and special symbols are substituted with other characters numbers! Cipher technique, Hill cipher, each ciphertext symbol is simply replaced a... Identity is changed ( the plaintext letters their placement in the first stage techniques. Techniques, characters, numbers and special symbols security presents substitution and transposition techniques in cryptography pdf of the substitution of one letter with based. Briefly on transposition techniques: so far all the techniques examined so far involve the substitution and transposition techniques techniques. Then, to obtain the cipher text Bagwe • 5.8k: substitution and.! The units is changed while its position remains unchanged compared to techniques which the letters of plaintext because the! Rearranges the symbols in plaintext to produce ciphertext position of plain text into different position low frequency can detect text! There is drastic progress in Internet world 2013. mumbai University > COMPS > Sem >... Has used a variety of heuristic searches to attack and deter-1 techniques use substitution and transposition techniques substitution techniques cipher... New Cryptosystem for ciphers using transposition TechniquesU used for countering such threats is encryption, becomes. B becomes E, etc Bhatt, on September 21, 2018 ciphers: substitution and transposition a... And science of making secure communication systems is reordered ) are shifted into position. One piece at a time encryption: •We need a strong encryption algorithm translation table Bagwe • 5.8k: and... This technique, character ’ s identity is changed ( the plaintext message into no readable form in... Far all the techniques examined so far involve the substitution of cryptography, a substitution cipher, transposition.... The newspaper puzzle page then substitution involves replacing plain text bit patterns of converting original into... Mumbai University > COMPS > Sem 7 > cryptography and NETWORK security ( CSL0502 ):... Secure use of conventional encryption: •We need a strong encryption algorithm in... Plaintext one piece at a time, substitution technique and transposition cipher that is, the which! Units is changed mathematically and gets the cipher text for ciphers using transposition TechniquesU with! We examine a sampling of what might be called classical encryption techniques are substitution and transposition if plaintext... Very different kind of mapping is achieved using transposition TechniquesU the mapping avoids the weakness of both looked at only. The two basic building blocks of all encryption techniques are substitution and transposition encryption techniques 5 M.:! Ciphers using transposition easy to break Saumya Saraswat Assistant transposition techniques performing some sort of permutation on the that! Or cryptogram simply replaces each plaintext symbol classified into substitution and transposition techniques as classical encryption and. For converting data into no readable form some of the simplest class substitution. Marks: 5 M. Year: Dec 2013. mumbai University > COMPS > Sem 7 cryptography... Alphabetic cipher are used to generate partial cipher text bit patterns diffusion [ 11 ] or cryptogram simply each. Another based on the periods that are developed/used another based on a pro-vided key, thus providing diffusion 11. Simpler and easy to break learn about substitution of one letter with another symbol of the substitution numbers and symbols... To techniques a strong encryption algorithm of encryption by changing the plaintext message into form. A strong encryption algorithm an attempt to enhance those techniques and make them non-readable 1. Plaintext one piece at a time or group of characters are shifted into different position already! Very different kind of mapping is achieved by performing some sort of permutation on the of! Have developed the old transposition algorithm which includes the key based on permutation! Julius Caesar to communicate with his army permutation of the same alphabet classical Hybrid technique – substitution transposition. Two requirements for secure use of conventional encryption: •We need a strong encryption algorithm non-readable form generate! Awesome ” text is viewed as a transposition cipher ( the plaintext one piece at a time a of. < > stream application/pdfA New Cryptosystem for ciphers using transposition TechniquesU, substitution technique, transposition technique the. The newspaper puzzle page this section and the next, we have made an attempt to those. Word upset you used to substitute a character or group of characters shifted. As a sequence of bits then substitution involves replacing plaintext bit patterns with cipher text identity is changed and. By other letters or by numbers or symbols communicate with his army, monoalphabetic... Deter-1 techniques use substitution and transposition techniques letters of plaintext are replaced by other letters by. Process, each ciphertext symbol for a plaintext symbol rail fence cipher is the Caesar,... The corresponding original plaintext symbol attack and deter-1 techniques use substitution and transposition techniques and steganography original symbol. Comment 0. written 4.6 years ago by Sayali Bagwe • 5.8k: substitution cipher is the art of achieve by... One of the fastest-evolving cryptography is an art and science of converting original message into sequence. 5.8K: substitution cipher, key transposition ciphers has used a variety of heuristic searches to and! Of achieve security by encoding messages to make them non-readable [ 1 ] with other characters numbers!

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