ECC NIST Random Number Generator (Dual EC DRBG) • Problematic • Even More Problematic After Snowden
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Medtronic Care Management Services, LLC CC FM TLS/SRTP FIPS 140
Medtronic Care Management Services, LLC CC FM TLS/SRTP FIPS 140‐2 Cryptographic Module Non‐Proprietary Security Policy Version: 1.6 Date: March 16, 2016 Copyright Medtronic Care Management Services 2016 Version 1.6 Page 1 of 14 Medtronic Care Management Services Public Material – May be reproduced only in its original entirety (without revision). Table of Contents 1 Introduction .................................................................................................................... 4 1.1 Cryptographic Boundary ..............................................................................................................5 1.2 Mode of Operation .......................................................................................................................5 2 Cryptographic Functionality ............................................................................................. 6 2.1 Critical Security Parameters .........................................................................................................7 2.2 Public Keys ....................................................................................................................................8 3 Roles, Authentication and Services .................................................................................. 8 3.1 Assumption of Roles .....................................................................................................................8 3.2 Services and CSP Access Rights ....................................................................................................8 -
An Enhanced Advanced Encryption Standard Algorithm
ISSN 2278 – 3091 International Journal of Advanced Trends in Computer Science and Engineering (IJATCSE), Vol. 4 , No.4 Pages : 28 - 33 (2015) Special Issue of ICEEC 2015 - Held on August 24, 2015 in The Dunes, Cochin, India http://warse.org/IJATCSE/static/pdf/Issue/iceec2015sp06.pdf An Enhanced Advanced Encryption Standard Algorithm Kshyamasagar Mahanta1, Hima Bindu Maringanti2 1Department of Computer Science & Engineering, North Orissa University, India, [email protected] 2Department of Computer Science & Engineering, North Orissa University, India, [email protected] modifying the shift row phase involved . Similarly, in 2010, Abstract: In today’s world most of the communication is El-Sayed Abdoul-Moaty ElBadawy et. al. and in 2011, done using electronic media. Data Security plays a vital role Zhang Zhao et. al. have modified the standard AES in such communication. Hence, there is a need to protect data algorithm by modifying the S-box generation using 1-D from malicious attacks. Cryptography is the study of logistic chaos equation . In 2011, Alireza Jolfaei et. al. have mathematical techniques related to aspects of information identified such issues and modified the standard algorithm by security such as confidentiality, data integrity, entity modifying the S-box using the chaotic baker’s map equations authentication and data origin authentication. In data and . telecommunications, cryptography is necessary when Here, we have followed a different approach by encrypting communicating over any unreliable medium, which includes the key used in the AES algorithm. For the key encryption, any network particularly the internet. we have used the RNG algorithm, which gives a unique Advanced Encryption Standard (AES), also known as random key for each time of encryption. -
A Practical Implementation of a One-Time Pad Cryptosystem
Jeff Connelly CPE 456 June 11, 2008 A Practical Implementation of a One-time Pad Cryptosystem 0.1 Abstract How to securely transmit messages between two people has been a problem for centuries. The first ciphers of antiquity used laughably short keys and insecure algorithms easily broken with today’s computational power. This pattern has repeated throughout history, until the invention of the one-time pad in 1917, the world’s first provably unbreakable cryptosystem. However, the public generally does not use the one-time pad for encrypting their communication, despite the assurance of confidentiality, because of practical reasons. This paper presents an implementation of a practical one-time pad cryptosystem for use between two trusted individuals, that have met previously but wish to securely communicate over email after their departure. The system includes the generation of a one-time pad using a custom-built hardware TRNG as well as software to easily send and receive encrypted messages over email. This implementation combines guaranteed confidentiality with practicality. All of the work discussed here is available at http://imotp.sourceforge.net/. 1 Contents 0.1 Abstract.......................................... 1 1 Introduction 3 2 Implementation 3 2.1 RelatedWork....................................... 3 2.2 Description ........................................ 3 3 Generating Randomness 4 3.1 Inadequacy of Pseudo-random Number Generation . 4 3.2 TrulyRandomData .................................... 5 4 Software 6 4.1 Acquiring Audio . 6 4.1.1 Interference..................................... 6 4.2 MeasuringEntropy................................... 6 4.3 EntropyExtraction................................ ..... 7 4.3.1 De-skewing ..................................... 7 4.3.2 Mixing........................................ 7 5 Exchanging Pads 8 5.1 Merkle Channels . 8 5.2 Local Pad Security . -
No Random, No Ransom: a Key to Stop Cryptographic Ransomware
No Random, No Ransom: A Key to Stop Cryptographic Ransomware Ziya Alper Genç, Gabriele Lenzini, and Peter Y.A. Ryan Interdisciplinary Centre for Security Reliability and Trust (SnT) University of Luxembourg Abstract. To be effective, ransomware has to implement strong encryp- tion, and strong encryption in turn requires a good source of random numbers. Without access to true randomness, ransomware relies on the pseudo random number generators that modern Operating Systems make available to applications. With this insight, we propose a strategy to miti- gate ransomware attacks that considers pseudo random number generator functions as critical resources, controls accesses on their APIs and stops unauthorized applications that call them. Our strategy, tested against 524 active real-world ransomware samples, stops 94% of them, including WannaCry, Locky, CryptoLocker and CryptoWall. Remarkably, it also nullifies NotPetya, the latest offspring of the family which so far has eluded all defenses. Keywords: ransomware, cryptographic malware, randomness, mitigation. 1 Introduction Ransomware is a malware, a malicious software that blocks access to victim’s data. In contrast to traditional malware, whose break-down is permanent, ransomware’s damage is reversible: access to files can be restored on the payment of a ransom, usually a few hundreds US dollars in virtual coins. Despite being relatively new, this cyber-crime is spreading fast and it is believed to become soon a worldwide pandemic. According to [24], a US Govern- ment’s white paper dated June 2016, on average more than 4,000 ransomware attacks occurred daily in the USA. This is 300-percent increase from the previous year and such important increment is probably due to the cyber-crime’s solid business model: with a small investment there is a considerable pecuniary gain which, thanks to the virtual currency technology, can be collected reliably and in a way that is not traceable by the authorities. -
Cryptanalysis of the Random Number Generator of the Windows Operating System
Cryptanalysis of the Random Number Generator of the Windows Operating System Leo Dorrendorf School of Engineering and Computer Science The Hebrew University of Jerusalem 91904 Jerusalem, Israel [email protected] Zvi Gutterman Benny Pinkas¤ School of Engineering and Computer Science Department of Computer Science The Hebrew University of Jerusalem University of Haifa 91904 Jerusalem, Israel 31905 Haifa, Israel [email protected] [email protected] November 4, 2007 Abstract The pseudo-random number generator (PRNG) used by the Windows operating system is the most commonly used PRNG. The pseudo-randomness of the output of this generator is crucial for the security of almost any application running in Windows. Nevertheless, its exact algorithm was never published. We examined the binary code of a distribution of Windows 2000, which is still the second most popular operating system after Windows XP. (This investigation was done without any help from Microsoft.) We reconstructed, for the ¯rst time, the algorithm used by the pseudo- random number generator (namely, the function CryptGenRandom). We analyzed the security of the algorithm and found a non-trivial attack: given the internal state of the generator, the previous state can be computed in O(223) work (this is an attack on the forward-security of the generator, an O(1) attack on backward security is trivial). The attack on forward-security demonstrates that the design of the generator is flawed, since it is well known how to prevent such attacks. We also analyzed the way in which the generator is run by the operating system, and found that it ampli¯es the e®ect of the attacks: The generator is run in user mode rather than in kernel mode, and therefore it is easy to access its state even without administrator privileges. -
Vulnerabilities of the Linux Random Number Generator
Black Hat 2006 Open to Attack Vulnerabilities of the Linux Random Number Generator Zvi Gutterman Chief Technology Officer with Benny Pinkas Tzachy Reinman Zvi Gutterman CTO, Safend Previously a chief architect in the IP infrastructure group for ECTEL (NASDAQ:ECTX) and an officer in the Israeli Defense Forces (IDF) Elite Intelligence unit. Master's and Bachelor's degrees in Computer Science from the Israeli Institute of Technology. Ph.D. candidate at the Hebrew University of Jerusalem, focusing on security, network protocols, and software engineering. - Proprietary & Confidential - Safend Safend is a leading provider of innovative endpoint security solutions that protect against corporate data leakage and penetration via physical and wireless ports. Safend Auditor and Safend Protector deliver complete visibility and granular control over all enterprise endpoints. Safend's robust, ultra- secure solutions are intuitive to manage, almost impossible to circumvent, and guarantee connectivity and productivity, without sacrificing security. For more information, visit www.safend.com. - Proprietary & Confidential - Pseudo-Random-Number-Generator (PRNG) Elementary and critical component in many cryptographic protocols Usually: “… Alice picks key K at random …” In practice looks like random.nextBytes(bytes); session_id = digest.digest(bytes); • Which is equal to session_id = md5(get next 16 random bytes) - Proprietary & Confidential - If the PRNG is predictable the cryptosystem is not secure Demonstrated in - Netscape SSL [GoldbergWagner 96] http://www.cs.berkeley.edu/~daw/papers/ddj-netscape.html Apache session-id’s [GuttermanMalkhi 05] http://www.gutterman.net/publications/2005/02/hold_your_sessions_an_attack_o.html - Proprietary & Confidential - General PRNG Scheme 0 0 01 Stateseed 110 100010 Properties: 1. Pseudo-randomness Output bits are indistinguishable from uniform random stream 2. -
Analysis of Entropy Usage in Random Number Generators
DEGREE PROJECT IN THE FIELD OF TECHNOLOGY ENGINEERING PHYSICS AND THE MAIN FIELD OF STUDY COMPUTER SCIENCE AND ENGINEERING, SECOND CYCLE, 30 CREDITS STOCKHOLM, SWEDEN 2017 Analysis of Entropy Usage in Random Number Generators KTH ROYAL INSTITUTE OF TECHNOLOGY SCHOOL OF COMPUTER SCIENCE AND COMMUNICATION Analysis of Entropy Usage in Random Number Generators JOEL GÄRTNER Master in Computer Science Date: September 16, 2017 Supervisor: Douglas Wikström Examiner: Johan Håstad Principal: Omegapoint Swedish title: Analys av entropianvändning i slumptalsgeneratorer School of Computer Science and Communication i Abstract Cryptographically secure random number generators usually require an outside seed to be initialized. Other solutions instead use a continuous entropy stream to ensure that the internal state of the generator always remains unpredictable. This thesis analyses four such generators with entropy inputs. Furthermore, different ways to estimate entropy is presented and a new method useful for the generator analy- sis is developed. The developed entropy estimator performs well in tests and is used to analyse en- tropy gathered from the different generators. Furthermore, all the analysed generators exhibit some seemingly unintentional behaviour, but most should still be safe for use. ii Sammanfattning Kryptografiskt säkra slumptalsgeneratorer behöver ofta initialiseras med ett oförutsägbart frö. En annan lösning är att istället konstant ge slumptalsgeneratorer entropi. Detta gör det möjligt att garantera att det interna tillståndet i generatorn hålls oförutsägbart. I den här rapporten analyseras fyra sådana generatorer som matas med entropi. Dess- utom presenteras olika sätt att skatta entropi och en ny skattningsmetod utvecklas för att användas till analysen av generatorerna. Den framtagna metoden för entropiskattning lyckas bra i tester och används för att analysera entropin i de olika generatorerna. -
Wheel of Fortune ANALYZING EMBEDDED OS (CS)PRNGS
Wheel of Fortune ANALYZING EMBEDDED OS (CS)PRNGS JOS WETZELS ALI ABBASI WHOIS • Jos Wetzels1,2 • Researcher, MSc student • samvartaka.github.io • Ali Abbasi1,3 • Ph.D. candidate • http://wwwhome.cs.utwente.nl/~abbasia/ 1Distributed and Embedded System Security (DIES) group, University of Twente, Netherlands 2SEC Group, Eindhoven University of Technology, Netherlands 3SYSSEC Group, Ruhr-University Bochum, Germany ABOUT • Introduction to Embedded OS Random Number Generators • Embedded Challenges Overview • Case Studies • Product of ongoing research EMBEDDED SYSTEMS ARE EVERYWHERE EMBEDDED SYSTEMS ARE BOOMING © DigiReach EMBEDDED RANDOMNESS IS HARD ROADMAP • Why Does This Matter? • OS PRNGs • Embedded Challenges • Case Studies SOME TERMS • Interested in random bits • Cannot predict next bit with Pr. > 0.5 • Entropy (Shannon / Renyi / …) • Measure of information unpredictability • High entropy → very random WHY RANDOMNESS IS IMPORTANT? • Cryptography • Keys, Nonces, Etc. • Exploit Mitigations • ASLR → Randomize address space • Stack Smashing Protection → Randomize canaries • Randomness is critical to security ecosystem • Failure has massive impact TRUE RANDOM NUMBER GENERATORS • Physical (‘true’) entropy source • Radioactive Decay, Shot Noise, Etc. • Two ways to implement it: • External (dedicated device) • Trusted Platform Module (TPM) • Hardware Security Module (HSM) • Integrated • Intel Ivy Bridge RdRand • Certain Smartcards • Downsides • Expensive • Portability issues PSEUDO RANDOM NUMBER GENERATORS • Software based • Deterministic algorithm -
Cryptgenrandom()
(Pseudo)Random Data PA193 – Secure coding Petr Švenda Zdeněk Říha Faculty of Informatics, Masaryk University, Brno, CZ Need for “random” data • Games • Simulations, … • Crypto – Symmetric keys – Asymmetric keys – Padding/salt – Initialization vectors – Challenges (for challenge – response protocols) – … “Random” data • Sometimes (games, simulations) we only need data with some statistical properties – Evenly distributed numbers (from an interval) – Long and complete cycle • Large number of different values • All values can be generated • In crypto we also need unpredictability – Even if you have seen all the “random” data generated until now you have no idea what will be the random data generated next “Random” data generators • Insecure random number generators – noncryptographic pseudo-random number generators – Often leak information about their internal state with each output • Cryptographic pseudo-random number generators (PRNGs) – Based on seed deterministically generate pseudorandom data • “True” random data generators – Entropy harvesters – gather entropy from other sources and present it directly What (pseudo)random data to use? • Avoid using noncryptographic random number generators • For many purposes the right way is to get the seed from the true random number generator and then use it in the pseudorandom number generator (PRNG) – PRNG are deterministic, with the same seed they produce the same pseudorandom sequence • There are situations, where PRNG are not enough – E.g. one time pad Noncryptographic generators • Standard rand()/srand(), random ()/srandom() functions – libc • “Mersenne Twister” • linear feedback shift registers • Anything else not labeled as cryptographic PRNG… • Not to be used for most purposes…. Noncryptographic generators Source: Writing secure code, 2nd edition Source: http://xkcd.com/ PRNG • Cryptographic pseudo-random number generators are still predictable if you somehow know their internal state. -
Security Policy for FIPS 140-2 Validation
Enhanced Cryptographic Provider Security Policy for FIPS 140‐2 Validation Microsoft Windows 8 Microsoft Windows Server 2012 Microsoft Windows RT Microsoft Surface Windows RT Microsoft Surface Windows 8 Pro Microsoft Windows Phone 8 Microsoft Windows Storage Server 2012 Enhanced Cryptographic Provider (RSAENH.DLL) DOCUMENT INFORMATION Version Number 1.2 Updated On December 17, 2014 © 2014 Microsoft. All Rights Reserved Page 1 of 25 This Security Policy is non‐proprietary and may be reproduced only in its original entirety (without revision). Enhanced Cryptographic Provider The information contained in this document represents the current view of Microsoft Corporation on the issues discussed as of the date of publication. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information presented after the date of publication. This document is for informational purposes only. MICROSOFT MAKES NO WARRANTIES, EXPRESS OR IMPLIED, AS TO THE INFORMATION IN THIS DOCUMENT. Complying with all applicable copyright laws is the responsibility of the user. This work is licensed under the Creative Commons Attribution-NoDerivs- NonCommercial License (which allows redistribution of the work). To view a copy of this license, visit http://creativecommons.org/licenses/by-nd-nc/1.0/ or send a letter to Creative Commons, 559 Nathan Abbott Way, Stanford, California 94305, USA. Microsoft may have patents, patent applications, trademarks, copyrights, or other intellectual property rights covering subject matter in this document. Except as expressly provided in any written license agreement from Microsoft, the furnishing of this document does not give you any license to these patents, trademarks, copyrights, or other intellectual property. -
Additional Source of Entropy As a Service in the Android User-Space
Faculty of Science Additional source of entropy as a service in the Android user-space Master Thesis B.C.M. (Bas) Visser Supervisors: dr. P. (Peter) Schwabe dr. V. (Veelasha) Moonsamy Nijmegen, July 2015 Abstract Secure encrypted communication on a smartphone or tablet requires a strong random seed as input for the encryption scheme. Android devices are based on the Linux kernel and are therefore provided with the /dev/random and /dev/urandom pseudo-random-number generators. /dev/random generates randomness from environmental sources but a number of papers have shown vulnerabilities in the entropy pool when there is a lack of user input. This thesis will research the possibility to provide additional entropy on the Android platform by extracting entropy from sensor data without the need for user input. The entropy level of this generated data is evaluated and this shows that it is feasible to extract randomness from the sensor data within reasonable time and using limited resources from the Android device. Finally, a prototype Android app is presented which uses generated sensor data as input for a stream cipher to create a pseudo-random-number generator in the Android user-space. This app can then be used as an additional source of randomness to strengthen random seeds for any process in the Android user-space on request. Additional source of entropy as a service in the Android user-space 1 Acknowledgements First I would like to thank my supervisor, Peter Schwabe. I started with a number of research projects that did not align with my interests and expertise. -
Crypto 101 Lvh
Crypto 101 lvh 1 2 Copyright 2013-2016, Laurens Van Houtven This book is made possible by your donations. If you enjoyed it, please consider making a donation, so it can be made even better and reach even more people. This work is available under the Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) license. You can find the full text of the license at https://creativecommons.org/licenses/by-nc/4.0/. The following is a human-readable summary of (and not a substitute for) the license. You can: • Share: copy and redistribute the material in any medium or format • Adapt: remix, transform, and build upon the material The licensor cannot revoke these freedoms as long as you follow the license terms: • Attribution: you must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use. • NonCommercial: you may not use the material for commercial purposes. • No additional restrictions: you may not apply legal terms or technological measures that legally restrict others from doing anything the license permits. 3 You do not have to comply with the license for elements of the material in the public domain or where your use is permitted by an applicable exception or limitation. No warranties are given. The license may not give you all of the permissions necessary for your intended use. For example, other rights such as publicity, privacy, or moral rights may limit how you use the material.