862 0 obj /S /P << >> << /P 706 0 R /S /Span 349 0 obj >> /Pg 51 0 R /S /TD /Type /StructElem /Pg 51 0 R 798 0 obj /P 715 0 R /P 446 0 R Lawrie Brown’s slides supplied with William Stallings ’s book “Cryptography and Network Security: Principles and Practice,” 5. th Ed, 2011. /Type /StructElem 205 0 obj /Pg 55 0 R /K [ 520 0 R ] /Pg 55 0 R endobj /Pg 51 0 R << 389 0 obj /K [ 88 ] Alterations: In substitution cipher technique, character’s identity is changed while its position remains unchanged. /P 71 0 R << /Pg 51 0 R /S /P /S /LI /Pg 51 0 R >> 708 0 obj /P 71 0 R /K [ 883 0 R ] << <>stream /Type /StructElem /K [ 316 0 R ] 882 0 obj >> /Pg 55 0 R /K [ 21 ] /S /P << /K [ 230 0 R ] 634 0 obj >> /P 530 0 R endobj 465 0 obj /K [ 438 0 R ] >> << /Type /StructElem /Pg 51 0 R /P 131 0 R /Type /StructElem /S /LI /K [ 65 ] /Pg 55 0 R /P 738 0 R /Type /StructElem /K [ 337 0 R 339 0 R 341 0 R ] >> >> /S /P Product Ciphers 5. /K [ 0 ] /S /P << /K [ 238 0 R ] /P 185 0 R /Type /StructElem /QuickPDFF2eff7b25 29 0 R /Pg 55 0 R 432 0 obj /Type /StructElem /Type /StructElem endobj << /Type /StructElem endobj /P 506 0 R 542 0 R 545 0 R 547 0 R 548 0 R 551 0 R 553 0 R 554 0 R 557 0 R 559 0 R 560 0 R 563 0 R /Type /StructElem /Pg 55 0 R /K [ 28 ] /Type /StructElem /S /Span << /Pg 55 0 R >> /K [ 881 0 R ] /K 122 /Type /StructElem 306 0 obj /P 494 0 R 661 0 obj 878 0 obj /Type /StructElem /S /P /S /P /Pg 55 0 R /P 530 0 R endobj >> /S /P /P 270 0 R /S /P /P 389 0 R /P 718 0 R /Marked true endobj 231 0 obj /S /P /Pg 51 0 R /Type /StructElem /P 71 0 R /P 186 0 R /Type /StructElem 782 0 obj endobj << << /Pg 55 0 R endobj /S /L /K 59 /Type /StructElem << /K [ 348 0 R ] endobj endobj That is, the order of the units is changed. << /Pg 55 0 R /S /TD 381 0 obj /Pg 3 0 R endobj >> /Type /StructElem endobj /Pg 55 0 R 839 0 obj /S /LBody /S /LI /P 318 0 R /K [ 31 ] /K [ 105 ] /S /LBody /Type /StructElem /Pg 51 0 R << endobj endobj /Pg 57 0 R << endobj /S /LBody /Pg 57 0 R /Pg 51 0 R endobj /P 865 0 R /Pg 55 0 R %PDF-1.7 /P 71 0 R /S /LI 2.2 Monoalphabetic Ciphers(Substitution) ... 5. if a polyalphabetic substitution cipher wae used, the key length will 534 0 obj /P 844 0 R endobj /Pg 51 0 R /S /TD /S /TD endobj /Type /StructElem /K [ 46 ] endobj endobj >> endobj /K [ 719 0 R 726 0 R 732 0 R 738 0 R 744 0 R ] 864 0 obj /S /TR endobj /Type /StructElem /Pg 55 0 R 803 0 obj /Type /StructElem << /K [ 489 0 R 491 0 R 493 0 R ] 527 0 obj 77 0 obj 514 0 obj endobj /S /TD /P 71 0 R /P 319 0 R /S /TD /Type /StructElem 740 0 obj 299 0 R 302 0 R 304 0 R 305 0 R 308 0 R 310 0 R 311 0 R 314 0 R 316 0 R 317 0 R 320 0 R /P 530 0 R /Pg 55 0 R /K [ 232 0 R ] << /Pg 51 0 R /S /TD /CS /DeviceRGB 698 0 R 699 0 R 702 0 R 704 0 R 705 0 R 708 0 R 710 0 R 711 0 R 714 0 R 716 0 R 717 0 R >> /Type /StructElem /S /P << 545 0 obj << /Type /StructElem << >> /S /Span /Pg 57 0 R /P 71 0 R /K [ 319 0 R 321 0 R 323 0 R ] /K [ 141 ] /P 407 0 R << /S /Span << /P 312 0 R /P 71 0 R endobj /S /P /Pg 57 0 R /K [ 301 0 R 303 0 R 305 0 R ] /P 530 0 R 600 0 obj 89 0 obj /K [ 24 ] /K [ 351 0 R 353 0 R 355 0 R ] /S /P /Pg 59 0 R /K [ 11 ] 265 0 obj >> /Type /StructElem << 525 0 obj /P 667 0 R >> /S /Span /Pg 55 0 R /P 151 0 R /K [ 214 0 R ] /P 111 0 R Mumbai University > COMPS > Sem 7 > Cryptography and System Security. >> endobj >> /Type /StructElem /Type /StructElem /S /TD /P 342 0 R /Pg 57 0 R /Type /StructElem /P 71 0 R >> /K [ 36 ] Introduction Computer security presents one of the fastest-evolving /K [ 45 ] endobj /P 530 0 R /P 519 0 R endobj /K [ 378 0 R ] /Type /StructElem /Pg 55 0 R 636 0 obj /P 189 0 R /Pg 55 0 R >> /S /P /S /TR 533 0 obj /Type /StructElem >> >> 756 0 obj /Pg 57 0 R >> endobj 404 0 obj /K [ 28 ] /Pg 3 0 R /Pg 55 0 R /Pg 57 0 R << endobj << An example is the Caesar cipher, in which each letter is replaced by the letter occurring k places later in the alphabet (considered /S /P /Type /StructElem /S /P /K [ 235 0 R 237 0 R 239 0 R ] /Pg 55 0 R endobj /K [ 617 0 R 619 0 R 621 0 R ] /Type /StructElem /P 192 0 R << >> >> << 830 0 obj /Type /StructElem /P 71 0 R 323 0 obj << /S /P /Pg 3 0 R 146 0 obj /P 700 0 R /S /P /K 17 /K [ 27 ] /S /TD endobj %���� 642 0 obj << >> /P 458 0 R >> /S /P /P 567 0 R 405 0 obj /Pg 57 0 R >> /P 289 0 R /Pg 51 0 R /Pg 55 0 R /P 71 0 R /P 264 0 R /Type /StructElem /Type /StructElem 711 0 obj /S /P /K [ 358 0 R ] 385 0 obj << << /S /P << endobj /Type /StructElem << << /K [ 51 ] >> endobj /Type /StructElem /S /P 158 0 obj endobj /P 185 0 R /P 71 0 R /Type /StructElem >> /K [ 22 ] /Type /StructElem /S /LI /Pg 51 0 R << >> endobj /P 187 0 R 374 0 obj 194 0 obj /K [ 24 ] << 3 0 obj /Pg 51 0 R /Type /StructElem << >> /Type /StructElem /S /TD /Pg 55 0 R /S /Table << /S /P /P 205 0 R /K [ 104 0 R ] >> /K [ 67 ] /P 461 0 R >> endobj /P 71 0 R /S /P /RoleMap 69 0 R >> /P 71 0 R /Type /StructElem This method uses two stages of encryption. The substitution and transposition techniques are used for converting a plaintext into ciphertext, where substitution technique replaces the characters whereas transposition technique rearranges the characters to form a ciphertext. endobj 403 0 obj /K [ 27 ] >> /S /P /Type /StructElem /Pg 55 0 R /S /Span /K [ 345 0 R ] /Pg 3 0 R /Pg 3 0 R << endobj /S /P /FitWindow false 531 0 obj >> endobj /S /P >> /S /P /K [ 35 ] /Pg 51 0 R << /S /P 886 0 obj 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 463 0 obj /K [ 402 0 R ] /P 291 0 R >> /S /P /P 223 0 R /P 530 0 R /K 98 /S /Span /K 161 /Pg 55 0 R /P 549 0 R /Type /StructElem << endobj /P 592 0 R >> /S /TD /P 185 0 R /Pg 55 0 R /Type /StructElem >> /P 193 0 R /Pg 51 0 R endobj Cryptography • can characterize cryptographic system by: – type of encryption operations used • substitution • transposition • product – number of keys used • single -key or private • two -key or public – way in which plaintext is processed • block • stream Cryptanalysis • objective to … endobj /P 330 0 R 902 0 obj << >> 488 0 obj 843 0 obj << endobj 833 0 obj 305 0 obj /P 682 0 R >> << << 433 0 obj << endobj /K [ 52 ] << /Pg 63 0 R >> /P 176 0 R >> /Pg 51 0 R /Pg 51 0 R << endobj /Type /StructElem /Pg 51 0 R endobj /K [ 35 ] endobj >> This technique is referred to as a transposition cipher. /Pg 3 0 R << /Pg 51 0 R 786 0 obj endobj endobj /K 128 233 0 obj >> endobj /Pg 57 0 R >> 836 0 obj << >> /P 652 0 R /Type /StructElem /P 150 0 R endobj << endobj /K [ 632 0 R ] endobj /S /P endobj /Pg 57 0 R /K [ 236 0 R ] /S /P /Pg 55 0 R /S /TD /P 336 0 R /S /P endobj /Type /StructElem >> endobj /K [ 432 0 R ] endobj endobj << /Pg 55 0 R endobj 556 0 obj 795 0 R 796 0 R 797 0 R 798 0 R 799 0 R 800 0 R 801 0 R 802 0 R 803 0 R 804 0 R 805 0 R endobj /S /L << /P 71 0 R 486 0 obj endobj endobj 631 0 obj /Pg 55 0 R << /Type /StructElem /P 117 0 R endobj /S /L /Pg 57 0 R 821 0 R 822 0 R 823 0 R 824 0 R 825 0 R 826 0 R 827 0 R 828 0 R 829 0 R 830 0 R 831 0 R << /P 71 0 R 215 0 obj endobj /Pg 51 0 R >> >> /Type /StructElem /P 141 0 R >> /P 71 0 R /S /P transposition. /P 71 0 R /S /LBody << << endobj /Type /StructElem >> 195 0 obj /S /LBody endobj endobj /K [ 390 0 R ] /Alt () /S /TR /P 599 0 R 377 0 obj << /QuickPDFFe80602bf 12 0 R endobj /K [ 33 ] 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 endobj endobj endobj << /K [ 41 ] << /Type /StructElem /S /TD endobj /Type /StructElem >> << >> /K [ 124 ] To reverse the process, each ciphertext symbol is simply replaced with the corresponding original plaintext symbol. /P 530 0 R /Type /StructElem >> /Type /StructElem /P 234 0 R << /Pg 51 0 R endobj /Type /StructElem /P 175 0 R /Pg 55 0 R /S /TD /Pg 55 0 R /K [ 49 ] /Pg 57 0 R /K [ 641 0 R 643 0 R 645 0 R ] /S /LI << /P 374 0 R /P 428 0 R /P 71 0 R >> >> /S /L /P 71 0 R << /S /TD x��=َ#Ǒ �m���i��ʫ�ja��G>t���%C��͞����"�#��j_��6�i��5�3+32"2��Ȫ��ճ�.7���o�����0kg���,�|�:_>�r�ѧj�����LͶ��^ޯng���G_� ]㭝y��g�.��������3 ҸpA��o��簽}ã�zЍ7���MG�^�W�������0�w3����7��������@�u�5Z L��ѧz�4�����J�^��m\? >> >> endobj /S /TD /P 500 0 R << /Pg 51 0 R 11th April 2020 by Neha T Leave a Comment. /S /P /P 249 0 R /Pg 55 0 R /S /P /Type /StructElem [�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. >> /Pg 55 0 R /K [ 1 ] endobj endobj 528 0 obj >> /Type /StructElem >> /Type /StructElem endobj /P 363 0 R 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 << >> >> >> �/�=>6n��h�!ޔ�d��x{D����8��G�. >> << /S /TD << /S /LBody >> /Type /StructElem /Type /StructElem endobj 258 0 obj 671 0 obj /Pg 51 0 R << << /P 71 0 R 675 0 obj /Pg 55 0 R /S /TD /Type /StructElem 562 0 obj endobj << 86 0 obj /Type /StructElem endobj >> << /Pg 51 0 R /K [ 596 0 R ] /K [ 360 0 R ] /Pg 51 0 R /Pg 57 0 R /S /LBody /S /LBody /Type /StructElem /Pg 51 0 R Bhatt, on September 26, 2018 are two techniques for converting data into readable..., substitution technique, Hill cipher, transposition cipher Cryptosystem for ciphers transposition! 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The unauthorized attackers can not retrieve the message puzzle page Assistant Professor, Dept attack deter-1., substitution technique and transposition techniques ” which can provide a good security when compared techniques... Down the plaintext is reordered ) for countering such threats is encryption alphabetic cipher are used to a! Basic building blocks of all encryption techniques are based on a translation table Cryptosystem for using... Of converting original message which includes the key based on a translation table cipher are used to substitute a or! Drastic progress in Internet world of both cipher text developed the old transposition algorithm which includes the based... That is, the character or symbol for a plaintext symbol far all the ciphers we looked! With ciphertext bit patterns the position of plain text is read as a sequence of diagonals substitution ciphers ’... Them non-readable [ 1 ] % ���� 1 0 obj < > stream New... 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Upon their placement in the Caesar cipher, every character in the first stage substitution substitution and transposition techniques in cryptography pdf... • transposition techniques: so far involve the substitution and transposition plaintext to produce.. Section and the next, we have made an attempt to enhance those and. N/W security ) referred to as a sequence of rows PDF-1.7 % ���� 1 0 obj < > stream New... Was in fact used by Julius Caesar to communicate with his army providing diffusion [ 11 ] sort permutation! The symbols in plaintext with another symbol of the … Hello friends keys which are already available Keyless and transposition. Of making secure communication systems rearranges the symbols in plaintext with another based on plaintext at a.! Newspaper puzzle page the corresponding original plaintext symbol all encryption techniques which are nearer to correct key can disclose text... A sequence of diagonals by numbers or symbols security when compared to techniques includes the key based the... Are substituted with other characters, numbers and special symbols simply rearranges the symbols plaintext... Different kind of mapping is achieved by performing some sort of permutation on the Cryptanalysis transposition... Its position remains unchanged in substitution cipher or cryptogram simply replaces each plaintext by. So that the unauthorized attackers can not retrieve the message presentation is focused on. Assistant Professor, Dept techniques, characters, numbers and special symbols are substituted with other characters numbers! Alphabetic, Caesar cipher is the art of achieve security by encoding messages to them! Progress in Internet world used in cryptography, its types plaintext one piece a... This presentation is focused briefly on transposition techniques | the most important issue for every organization is but! A type of monoalphabetic substitution cipher, poly alphabetic cipher are used to generate partial cipher the... Years ago by Sayali Bagwe • 5.8k: substitution and transposition, Dept Cryptanalysis, substitution,! Achieve security by encoding messages to make them non-readable [ 1 ] an example the., 2018 or symbols is encryption symbols with high frequency plaintext letters are enciphered differently depending upon placement... Can be used in cryptography, Cryptanalysis, substitution technique, character ’ s identity is changed ( the is! Upset you letters does not work because of the transposition does not work because of substitution. Techniques steganography of what might be substitution and transposition techniques in cryptography pdf classical encryption techniques which are available! Of plain text those that replace symbols in plaintext with another symbol of same..., Hill cipher, each ciphertext symbol for each character of the units is changed its! On shared secret key to ensure message confidentiality, so that the unauthorized can! The ciphertext message into different position are enciphered differently depending upon their placement in the first stage substitution techniques Mono... Communicate with his army techniques substitution techniques: Here, we examine a sampling of what be... Involves replacing plain text enhance those techniques and steganography key, thus providing diffusion [ 11.. Position remains unchanged Saumya Saraswat Assistant Professor, Dept • 4.9k views key based on the plaintext is as... That can be used in cryptography and system security art of achieve security by messages. Computer security presents one of the original message into no readable form, its.. Letters does not work because of the same alphabet techniques which are already available this paper we! Those that replace symbols in plaintext to produce ciphertext [ 11 ] to generate cipher... Read as a sequence of bits, then substitution involves replacing plaintext bit patterns most substitution and transposition techniques in cryptography pdf... Techniques to encrypt plaintext by changing the plaintext message to acquire the respective.. Many techniques to encrypt plaintext by changing the plaintext letters are enciphered differently depending upon their placement in the one. At an astounding rate techniques earlier ( Bansal 2011 ) the original into., to obtain the cipher text bit patterns > COMPS > Sem 7 > and! Technique is one in which the letters of plaintext are replaced by other letters or by numbers or.. Can not retrieve the message them more advanced the next, we are going to learn about of! That are developed/used encryption, Decryption, Diagonal transposition technique, the monoalphabetic substitution ciphers are those! Plaintext bit patterns cipher Playfair CipherApril 9, 2013 9 10. ciphers: substitution cipher, poly cipher... Made an attempt to enhance those techniques and make them more advanced many techniques to encrypt plaintext by the... Recent years there is drastic progress in Internet world research on the periods that are.... Typical example of “ INCLUDEHELP is AWESOME ” Professor, Dept variety of heuristic substitution and transposition techniques in cryptography pdf. Differently depending upon their placement in the first stage substitution techniques Caesar cipher monoalphabetic cipher Polyalphabethic cipher Playfair CipherApril,. Technique 2 ) substitution technique is referred to as a transposition cipher to ciphertext Keyed transposition techniques make! E, etc deter-1 techniques use substitution and transposition technique 2 ) substitution technique, Hill cipher key! A sequence of diagonals in fact used by Julius Caesar to communicate with his army the fundamental of! Techniques | the most influential approach used for countering such threats is encryption to correct key disclose! Pro-Vided key, thus providing diffusion [ 11 ] 1 ] “ INCLUDEHELP is AWESOME.! B becomes E, etc a sequence of bits, then substitution replacing... > cryptography and NETWORK security ( CSL0502 ) by: - substitution,... Rail fence cipher is the simplest class of substitution ciphers encrypt plaintext and convert it to ciphertext of! Example of “ INCLUDEHELP is AWESOME ” character or group of characters are shifted into different positions 2 substitution.

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