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Block cipher operation

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  • The contents of this chapter include all of the following: multiple encryption & DES, why not double-DES? triple-DES with two-keys, modes of operation, electronic codebook book (ECB), advantages and limitations of ECB, cipher block chaining (CBC).

    ppt63p koxih_kothogmih3 24-08-2020 6 0   Download

  • Data-Driven Block ciphers for fast telecommunication systems. Among different directions of applied cryptography, the cipher design based on the data-driven operations (DDOs) is, by comparison, poorly represented in the published and available literature.

    pdf210p dunglh2013 05-04-2014 477 434   Download

  • USE OF MODERN BLOCK CIPHERS Symmetric-key encipherment can be done using modern block ciphers. Modes of operation have been devised to encipher text of any size employing either DES or AES. Error Propagation A single bit error in transmission can create errors in several in the corresponding block.

    ppt20p vovantien_2 05-12-2012 587 518   Download

  • USE OF MODERN BLOCK CIPHERS Symmetric-key encipherment can be done using modern block ciphers. Modes of operation have been devised to encipher text of any size employing either DES or AES. 1 USE OF MODERN BLOCK CIPHERS Electronic codebook (ECB) mode Error Propagation A single bit error in transmission can create errors in several in the corresponding block. However, the error does not have any effect on the other blocks.

    pdf10p vovantien_2 05-12-2012 101 43   Download

  • Block ciphers are among the most widely used types of cryptographic algorithms provide secrecy and/or authentication services in particular will introduce DES (Data Encryption Standard)

    ppt40p muathu_102 28-01-2013 48 4   Download

  • Overall, the microfinance sector is continuing to expand despite tremendous operating obstacles in serving the market in a sustainable way. The lack of access to financial services for households and micro and small enterprises is quite striking in Africa and microfinance institutions are crucial in responding to the unbanked segments. However, the microfinance sector is still relatively small and weak compared to other global regions and despite the huge potential market. In this context, the role of savings banks in microfinance should be recognised and boosted.

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  • Advanced Encryption Standard competition began in 1997 Rijndael was selected to be the new AES in 2001 AES basic structures: block cipher, but not Feistel cipher encryption and decryption are similar, but not symmetrical basic unit: byte, not bit block size: 16-bytes (128 bits) three different key lengths: 128, 192, 256 bits AES-128, AES-192, AES-256 each 16-byte block is represented as a 4 x 4 square matrix, called the state matrix the number of rounds depends on key lengths 4 simple operations on the state matrix every round (except the last round) ...

    ppt38p muathu_102 28-01-2013 57 2   Download

  • Các kiểu thao tác đầu tiên được đề nghị (ECB, CBC, OFB, CFB) đảm bảo tính bí mật (confidentiality), không giúp đảm bảo tính toàn vẹn thông tin (message integrity). Các kiểu thao tác được thiết kế cho phép (CCM, EAX và OCB) vừa đảm bảo tính bí mật, vừa đảm bảo xác định tính toàn vẹn thông tin.

    ppt96p i4share 04-02-2013 56 10   Download

  • Bài giảng An toàn bảo mật hệ thống - Chủ đề 3 trình bày 2 nội dung chính, đó là: Các kiểu thao tác (Modes of Operation), các kiểu chèn bổ sung thông tin (Padding Scheme). Mời các bạn cùng tham khảo dể nắm bắt các nội dung chi tiết.

    pdf15p youcanletgo_04 15-01-2016 66 5   Download

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