>> << << /K [ 635 0 R 637 0 R 639 0 R ] /S /TD endobj /Pg 55 0 R /S /P << >> /K [ 31 ] << << /K [ 65 ] /S /P << 720 0 obj << 566 0 obj Cryptography and Network Security Chapter 2 Fifth Edition by William Stallings Lecture slides by Lawrie Brown (with edits by RHB) Chapter 2 – Classical Encryption Techniques • "I am fairly familiar with all the forms of secret writings, and am myself the author of a trifling monograph upon the subject, in which I analyze one hundred and sixty separate ciphers," said Holmes. /P 216 0 R /Type /StructElem endobj /P 567 0 R /Type /StructElem << << >> of CSA ITM University, Gwalior SUBSTITUTION AND TRANSPOSITION TECHNIQUES CONTENTS TYPES OF ATTACKS ON ENCRYPTED MESSAGE SUBSTITUTION TECHNIQUES CAESER CIPHER MONOALPHABETIC CIPHER << /K [ 532 0 R 534 0 R 536 0 R ] /S /P /K [ 58 ] /P 350 0 R >> /P 210 0 R endobj 711 0 obj 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 /Type /StructElem >> /K [ 724 0 R ] 300 0 obj /P 204 0 R << /Pg 51 0 R /P 71 0 R 266 0 obj 252 0 obj >> For >> endobj << /P 592 0 R /K [ 629 0 R 631 0 R 633 0 R ] /Pg 3 0 R << 808 0 R 809 0 R 810 0 R 811 0 R 812 0 R 813 0 R 814 0 R 815 0 R 792 0 R 791 0 R 790 0 R /K [ 39 ] /Type /StructElem /Pg 59 0 R >> /S /GoTo >> endobj /Type /StructElem /K [ 50 ] /K [ 64 ] endobj >> /Pg 55 0 R /Pg 55 0 R << /Pg 55 0 R /Pg 51 0 R << /Type /StructElem /P 106 0 R endobj 96 0 obj << 226 0 obj /Pg 55 0 R /S /LI >> /K [ 79 ] /P 670 0 R /S /TR /P 628 0 R /K 167 << /K [ 9 ] /P 71 0 R /P 640 0 R /P 71 0 R /P 851 0 R >> /Type /StructElem >> /S /TD >> 295 0 obj /K [ 1 ] >> /Type /StructElem << 488 0 obj << endobj << endobj >> endobj /Alt () /P 219 0 R endobj /Type /StructElem /K 11 /Type /StructElem >> We equated cryptography with a toolkit where various cryptographic techniques are c ... As in case of substitution cipher, cryptanalysis is possible on the Playfair cipher as well, however it would be against 625 possible pairs of letters (25x25 alphabets) instead of 26 different possible alphabets. /P 229 0 R endobj >> /S /TD /Type /StructElem 345 0 obj << All the techniques examined so far involve the substitution of a ciphertext symbol for a plaintext symbol. /Pg 55 0 R >> /Type /StructElem << << endobj 861 0 obj /P 683 0 R 424 0 obj 167 0 obj endobj endobj /S /TD /S /P /K [ 82 ] << 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. << /K [ 37 ] We examine these in the next two sections. >> << /P 122 0 R /S /Span The threats to information security have been incrementing at an astounding rate. /K [ 9 ] /Type /StructElem First, we write the message in a zigzag manner then read it out direct row-… >> endobj /K [ 114 0 R ] /S /P /K [ 538 0 R 540 0 R 542 0 R ] /Type /StructElem /S /TD /K [ 10 ] << << endobj Welcome to my channel. >> /K [ 871 0 R ] /P 111 0 R /Type /StructElem endobj 117 0 obj /S /L endobj /K [ 432 0 R ] /Pg 51 0 R >> >> /P 71 0 R /P 343 0 R 224 0 obj /K [ 484 0 R ] An example is the Caesar cipher, in which each letter is replaced by the letter occurring k places later in the alphabet (considered << << /K [ 289 0 R 291 0 R 293 0 R ] /S /TD << /S /TD endobj 629 0 obj /Type /StructElem /P 185 0 R << endobj /Type /StructElem 743 0 obj /S /P endobj << 828 0 obj /Type /StructElem /P 71 0 R /Pg 3 0 R 417 0 obj Product Ciphers 4. /S /P endobj >> /Pg 55 0 R /Type /StructElem /P 283 0 R /K [ 121 ] Symmetric Ciphers Lectured by Nguyễn Đức Thái. endobj /Pg 59 0 R endobj /Pg 55 0 R /P 237 0 R >i�G�?�և����"m{tAI��rFhB)��Y��R7eX��{���롭�p+3�F�Vf˶i�9׿�_�,g����H�M���b��4��^4�M�p�z�TFIC3�C�:-Qt��-�WH �g����0����� ��ɡ�4ǣ�\�� U�B~W>�J�i٦ZV6-�3HRV+^&Ӳ����m���nљo�@%nj�tZ��YD�bJ�.9���u��e^݀N�׻�E�Ç��0���� Å5!C{�t�a�n�)kA�&Dx����#�~ jރʭ�)� �1=~��/@�EB�:��+�x��X�U�%݄RiK������Q��%n�hlz1�n��X��h٫����P�û��� ��^�H��,m|t����qޣ�)�m����-Z����9M���Y�4�'��NQ�k��s,P������~]��'�����[X���Q�|��auBh����rOh�ёir��J�mĤR���Km1 /Pg 51 0 R endobj /Type /StructElem /K [ 14 ] >> /K [ 402 0 R ] endobj /K [ 73 ] >> endobj /P 342 0 R endobj << /Pg 55 0 R 569 0 obj << endobj 419 0 obj << /S /P /P 344 0 R << /S /Span >> /Pg 51 0 R /S /P endobj 703 0 obj 157 0 obj /K [ 22 ] /K [ 332 0 R ] In recent years there is drastic progress in Internet world. /K [ 378 0 R ] >> x��][s7�~OU��Ye���`˥*I�s�Y'�DgOm%�@K��JTHʎ��ݸ��ȧR��\��|� _������ի������n}3�������/��Ѵb&U߰nvu��7������o~��{X,��q�_�9~\��!��n!�g��b��_9���'�g��P�uo^|Ă�����G]�)t�_����b���&vv��ZǍ.���������y_�B�%|��l����߿�捞��8�&.kd9����oh�T,z�ei�p���ax�,~�����礨_��05�}��ޖ��ȸ}��� i��PI��4Jq�7-MZ�F*�цw鐪��x#yZ���$�A� �@���3�'�,k���` �����Rjv�f�� ���5{��r����.v���~|���gX��݌Ɇs�9������iE3Ҹb1��˟`��/߽���0Č�IsJ��D�a�����w�as �]mg��X����> ��77��l~��^����z����d�����eL5D%�sP1b�uM����BL��/O`����t�,�Wj�z��g�fH/�Ns-U�p�q�_=��w0��F�84� �� Abstract: cryptography, its types achieve security by encoding messages to make them non-readable [ 1 ] progress Internet! 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