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[原创]一个基于数字签名的KeygenMe(已增加注册机算法)
sessiondiy 請繼續努力~ |
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[原创]一个基于数字签名的KeygenMe(已增加注册机算法)
這算是一種 public key cryptosystem,所以某種情況下,公布算法( algorothm) 來接受大家的挑戰,我想也是必要的。 我已請 lingyu 大大整理好算法之後,公布上來,請大家盡情地 enjoy 您的 break/attack。 |
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[原创]招聘过程中高奏凯歌,却在HR面被鄙视
因為合約期滿。 "你覺得什么樣的公司對你才有發展" 提供職前訓練、在職訓練及員工分紅獎金制度等。 "你為什么跳那么多公司" 合約期滿,自願離職。 "你覺得你的XX達到了什么水平" 這個不好說。說簡單點,怕污辱各位的IQ,說難一點,我耽心各位又聽不懂。 |
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[原创]一个基于数字签名的KeygenMe(已增加注册机算法)
这个算法是我和 lingyu 一起讨论的内容,lingyu 是最大贡献者。 原本的算法( 2000 年) 到现在的算法(2009 年) ,历经多次不同学者改版,并发表到优秀的 journal paper 或是 conference paper 上。 现在把一部分的内容,以 KeygenMe 的方式呈现出来,让大家一窥密码术在 KeygenMe 上的实践。 本次的讨论内容,将有可能成为密码学书中的一部份,如果不愿曝光或是不希望自己的技术被流传的话,请先注明。我将不会把讨论内容放进书本之中。 欢迎大家共同讨论,当然也希望 ccfer 及 sessiondiy 兩位大牛能再次参与本帖内容的讨论与指导。 |
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[求助]《A New Side-Channel Attack on RSA Prime Generation》2009年8月份的论文一篇
A New Side-Channel Attack on RSA Prime Generation.pdf |
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[分享]密码学介绍
[QUOTE=TrampDog;706639]一堆密码学书籍,看了一下就这本小于1M,贡献出来,其他的都在20MB以上,无法上传 An Introduction to Cryptography [NAI].pdf[/QUOTE] 1) 請副壇主以上的管理者幫忙上傳。 2) or 自行分割上傳。 謝謝分享。 |
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[求助]新手问一下,学了密码学,对软件破解有没有用?
只知道 input/output 的話,就回歸到單純的軟件追蹤與破解,也就是這裡大家熟知的 crackme/reverse me 上面。如果這裡面有用到密碼學的技術,進行資料的進階處理,那又是另一個討論的問題。 我也很好奇用什麼方法。 有一文章是我所知道的經典討論帖,主要是兩位超級牛人 ccfer 及 sessiondiy 為主要解說員。 該帖在 【原创】Keygenme II 可以閱讀的到。 |
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[求助]新手问一下,学了密码学,对软件破解有没有用?
如果單純的把兩件事分開來看的話,是沒有什麼關聯。 密碼學歸密碼學,軟件破解歸軟件破解。 如果軟件裡面沒有用到密碼學的技術,或是很簡易的加密/解密方法,那就是單純的破解軟件;反之,如果這裡面有使用到密碼術的話,那又是另一個討論的議題。 我同意你的說法。可是如我前面所說,要看個案情況才能知道有沒有關係。 |
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[原创]Comment on Authentication of Anycast Communication
接到這封緊急又臨時的信,真的讓我很無言,況且還是我在登機前收到的。 我還利用轉機等候的時間,按他們的意思改了一下,這不是小修,是大改,我也認了。 更新後版本,我重新放上來。 From: papers@icitst.org To: Rock Sent: Monday, November 02, 2009 5:32 AM Subject: RE: FW: ICITST-2009: Final amendments (ID 5) Dear Mr Liu, The corrections that we asked you to do are minor. We did not ask you to write a full paper (6-8 pages) within 2-3 hours. We are also aware that you submitted an extended abstract (note more than 2 pages), which is absolutely fine. In order for your extended abstract to look presentable, we asked you to make final minor amendments. Moreover, within the past 24 hours I have been in touch with more than 23 authors to ask them make the final amendments. None of these authors sent this kind of reply. On the contrary, we received amended papers pretty fast and without any issue. If you are not able to make minor changes, you will put us in a position to question if you really wrote this paper. Finally, if you are not able to do it, the ICITST-2009 would be glad to refund the registration fee and sustain the reputation of the high-calibre conference. Please let me know of you final decision ASAP. Regards, Professor Ion Tutanescu and Professor Godfried Williams ICITST-2009 General Co-Chairs ============================= From: papers@icitst.org To: Rock Cc: Sent: Sunday, November 01, 2009 10:07 PM Subject: ICITST-2009: Final amendments (ID 5) Dear Mr Liu, Please apply the following amendments to your abstract and email it not later than Monday 2nd of November, by 6:00 GMT. Title: - Please amend your title to read "Improvement of Authentication of Anycast Communication" Abstract: - Please remove the reference [1] from the abstract. - Do not use "I" in the paper. Replace the sentence "In this comment, I would like to point out an error in the related work and scheme section of Al- Ibrahim and Anton Cerny [1]." with "This paper emphasises on the error in related work and scheme section of Al-Ibrahim and Anton Cerny. Add the following sections after the abstract: 1. Introduction 2. Related Work (with a brief explanation at the beginning of the section insert the current section 1 "Review on authentication of anycast communication" into the Related Work section). 3. Contribution to Knowledge (what you actually found out as the error in Al-Ibrahim and Anton Cerny approach). 3.1. Improvement on Al-Ibrahim and Anton Cerny's approach 4. Conclusion 5. References (please add at least 5 references) Best regards, Professor Ion Tutanescu ICITST-2009 General Co-Chair ============================ |
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[求助]新手问一下,学了密码学,对软件破解有没有用?
I can not agree with you anymore. (非常同意這句話的觀點) |
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[分享]大整数因子分解问题的研究
萬丈高樓平地起,基礎的東西更好,易於傳播知識。 |
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[分享]大整数因子分解问题的研究
光看 directories 就很嚇人~ |
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[分享]歡迎投稿ISITA2010,並相約在台灣台中見面。
一點都不麻煩。 |
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[讨论]GPUs 用於 Cryptanalysis 之可行性評估。
http://www.springerlink.com/content/j6838p2588754610/?p=c526ffae22a944fd964f6716d2ff2165&pi=10 Parallel LDPC Decoding on GPUs Using a Stream-Based Computing Approach Gabriel Falcão1 , Shinichi Yamagiwa2 , Vitor Silva1 and Leonel Sousa2, 3 (1) Department of Electrical and Computer Engineering, University of Coimbra, Instituto de Telecomunicações Polo II - Universidade de Coimbra, 3030-290 Coimbra, Portugal (2) INESC-ID, Technical University of Lisbon, Rua Alves Redol n.9, 1000-029 Lisboa, Portugal (3) Department of Electrical and Computer Engineering, IST, Technical University of Lisbon, Rua Alves Redol n.9, 1000-029 Lisboa, Portugal Received: 8 July 2008 Revised: 20 May 2009 Published online: 28 September 2009 Abstract Low-Density Parity-Check (LDPC) codes are powerful error correcting codes adopted by recent communication standards. LDPC decoders are based on belief propagation algorithms, which make use of a Tanner graph and very intensive message-passing computation, and usually require hardware-based dedicated solutions. With the exponential increase of the computational power of commodity graphics processing units (GPUs), new opportunities have arisen to develop general purpose processing on GPUs. This paper proposes the use of GPUs for implementing flexible and programmable LDPC decoders. A new stream-based approach is proposed, based on compact data structures to represent the Tanner graph. It is shown that such a challenging application for stream-based computing, because of irregular memory access patterns, memory bandwidth and recursive flow control constraints, can be efficiently implemented on GPUs. The proposal was experimentally evaluated by programming LDPC decoders on GPUs using the Caravela platform, a generic interface tool for managing the kernels' execution regardless of the GPU manufacturer and operating system. Moreover, to relatively assess the obtained results, we have also implemented LDPC decoders on general purpose processors with Streaming Single Instruction Multiple Data (SIMD) Extensions. Experimental results show that the solution proposed here efficiently decodes several codewords simultaneously, reducing the processing time by one order of magnitude. Keywords data-parallel computing - graphics processing unit (GPU) - Caravela - low-density parity-check (LDPC) code - error correcting code This work was partially supported by the Portuguese Foundation for Science and Technology, through the FEDER program, and also under Grant No. SFRH/BD/37495/2007. |
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