41 Damgard PPTs View free & download

Merkle Damgard Revisited: how to Construct a hash Function PowerPoint PPT Presentation

Merkle Damgard Revisited: how to Construct a hash Function - Merkle Damgard Revisited: how to Construct a hash Function. Jean-Sebastien Coron. Yevgeniy Dodis ... Is SHA-1 obscure enough to successfully replace a random oracle? ...

Merkle Damgard Revisited: how to Construct a hash Function. Jean-Sebastien Coron. Yevgeniy Dodis ... Is SHA-1 obscure enough to successfully replace a random oracle? ...

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A Design Principle for Hash Functions Ivan Damgard CRYPTO 1987 PowerPoint PPT Presentation

A Design Principle for Hash Functions Ivan Damgard CRYPTO 1987 - One provably collision free construction existed ... provably secure hash functions over arbitrary domains. 3. Notation. 1) F = {Fm} m=1. 1 ...

One provably collision free construction existed ... provably secure hash functions over arbitrary domains. 3. Notation. 1) F = {Fm} m=1. 1 ...

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Cryptographic Hash Functions Message Authentication Digital Signatures PowerPoint PPT Presentation

Cryptographic Hash Functions Message Authentication Digital Signatures - Cryptographic Hash Functions Message Authentication Digital Signatures * * Abstract We will discuss Cryptographic hash functions Message authentication codes HMAC and ...

Cryptographic Hash Functions Message Authentication Digital Signatures * * Abstract We will discuss Cryptographic hash functions Message authentication codes HMAC and ...

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Hash Functions PowerPoint PPT Presentation

Hash Functions - Title: Intro Author: Mark Stamp Last modified by: Mark Stamp Created Date: 6/9/2003 3:34:05 PM Document presentation format: On-screen Show Other titles

Title: Intro Author: Mark Stamp Last modified by: Mark Stamp Created Date: 6/9/2003 3:34:05 PM Document presentation format: On-screen Show Other titles

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Cryptographic Hash Functions PowerPoint PPT Presentation

Cryptographic Hash Functions - Cryptographic Hash Functions CS 470 Introduction to Applied Cryptography Instructor: Ali Aydin Selcuk Cryptographic Hash Functions Maps an arbitrary length input to a ...

Cryptographic Hash Functions CS 470 Introduction to Applied Cryptography Instructor: Ali Aydin Selcuk Cryptographic Hash Functions Maps an arbitrary length input to a ...

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Hash Functions - Hash Functions 21. The Right Way to HMAC. Described in RFC 2104 ... SHA-1, MD5, Tiger, etc. Define. ipad = 0x36 repeated B times. opad = 0x5C repeated B times ...

Hash Functions 21. The Right Way to HMAC. Described in RFC 2104 ... SHA-1, MD5, Tiger, etc. Define. ipad = 0x36 repeated B times. opad = 0x5C repeated B times ...

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A Framework for Fair (Multi-Party) Computation Juan Garay (Bell Labs) Phil MacKenzie (Bell Labs) Ke Yang (CMU) PowerPoint PPT Presentation

A Framework for Fair (Multi-Party) Computation Juan Garay (Bell Labs) Phil MacKenzie (Bell Labs) Ke Yang (CMU) - Title: Crowds: Anonymous Web Transactions Author: rubin Last modified by: Linda Casals Created Date: 7/7/1997 2:25:08 PM Document presentation format

Title: Crowds: Anonymous Web Transactions Author: rubin Last modified by: Linda Casals Created Date: 7/7/1997 2:25:08 PM Document presentation format

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Ha - Ha ovac funkce, MD5 a nsk tok To nejlep , co pro v s kryptologov mohou ud lat je, kdy v s p esv d , abyste jim slep ned v ovali.

Ha ovac funkce, MD5 a nsk tok To nejlep , co pro v s kryptologov mohou ud lat je, kdy v s p esv d , abyste jim slep ned v ovali.

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Feistel Networks made Public, and Applications. PowerPoint PPT Presentation

Feistel Networks made Public, and Applications. - With general FIL-MACs, need collision-resistant hash functions! CBC-MAC Popular domain extension technique for MACs Secure if FIL-MAC is a PRF [BKR94].

With general FIL-MACs, need collision-resistant hash functions! CBC-MAC Popular domain extension technique for MACs Secure if FIL-MAC is a PRF [BKR94].

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Collisions for Step-Reduced SHA 256 PowerPoint PPT Presentation

Collisions for Step-Reduced SHA 256 - Collisions for Step-Reduced SHA 256 Ivica Nikoli , Alex Biryukov University of Luxembourg Outline Short description of SHA-256 Difference between SHA-1 and SHA-2 ...

Collisions for Step-Reduced SHA 256 Ivica Nikoli , Alex Biryukov University of Luxembourg Outline Short description of SHA-256 Difference between SHA-1 and SHA-2 ...

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Cryptographic Hashing: An Overview based mostly on my own work, and loosely following Mironov PowerPoint PPT Presentation

Cryptographic Hashing: An Overview based mostly on my own work, and loosely following Mironov - Pre. ePre. aPre. fixed key. random key. Preimage. Collision. Sec. eSec. aSec. Second. Preimage ... fixed. range point. random. range point. random. domain point ...

Pre. ePre. aPre. fixed key. random key. Preimage. Collision. Sec. eSec. aSec. Second. Preimage ... fixed. range point. random. range point. random. domain point ...

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Introduction to Practical Cryptography PowerPoint PPT Presentation

Introduction to Practical Cryptography - Introduction to Practical Cryptography Hash Functions Agenda Hash Functions Properties Uses General Design Examples: MD4, MD5, SHA-0, SHA-1, SHA-256 Collision Attacks ...

Introduction to Practical Cryptography Hash Functions Agenda Hash Functions Properties Uses General Design Examples: MD4, MD5, SHA-0, SHA-1, SHA-256 Collision Attacks ...

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MD5 - MD5 Message Digest 5 Strengthened version of MD4 Significant differences from MD4 are 4 rounds, 64 steps (MD4 has 3 rounds, 48 steps) Unique additive constant each ...

MD5 Message Digest 5 Strengthened version of MD4 Significant differences from MD4 are 4 rounds, 64 steps (MD4 has 3 rounds, 48 steps) Unique additive constant each ...

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Cryptographic Hash Functions - 3 K, the keyspace, is a finite set of possible keys ... the number of oracle queries made by algorithms is at most q. ... Collision for the same hash function h. ...

3 K, the keyspace, is a finite set of possible keys ... the number of oracle queries made by algorithms is at most q. ... Collision for the same hash function h. ...

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Introduction to Practical Cryptography - Introduction to Practical Cryptography Forward Key Security Zero Knowledge Oblivious Transfer Multi-Party Computation

Introduction to Practical Cryptography Forward Key Security Zero Knowledge Oblivious Transfer Multi-Party Computation

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Cryptographic Hashing: Blockcipher-Based Constructions, Revisited PowerPoint PPT Presentation

Cryptographic Hashing: Blockcipher-Based Constructions, Revisited - 'Fact Collision resistance implies 2nd-preimage resistance of hash ... 3. Collision resistance given a hash function. it is hard to find two colliding inputs ...

'Fact Collision resistance implies 2nd-preimage resistance of hash ... 3. Collision resistance given a hash function. it is hard to find two colliding inputs ...

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Example:the Diffie-Hellman Key Exchange PowerPoint PPT Presentation

Example:the Diffie-Hellman Key Exchange - Title: Example:the Diffie-Hellman Key Exchange Author: hk Last modified by: Hugo K Created Date: 7/23/2003 6:47:28 PM Document presentation format

Title: Example:the Diffie-Hellman Key Exchange Author: hk Last modified by: Hugo K Created Date: 7/23/2003 6:47:28 PM Document presentation format

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Public-Key Cryptography PowerPoint PPT Presentation

Public-Key Cryptography - Title: PowerPoint Presentation Last modified by: Prof. Mostafa Created Date: 1/1/1601 12:00:00 AM Document presentation format:

Title: PowerPoint Presentation Last modified by: Prof. Mostafa Created Date: 1/1/1601 12:00:00 AM Document presentation format:

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6.897: Selected Topics in Cryptography Lectures 9 and 10 PowerPoint PPT Presentation

6.897: Selected Topics in Cryptography Lectures 9 and 10 - ... IKEv2, SSL/TLS, What about password-based key exchange? What about modeling symmetric encryption and message authentication as ideal functionalities?

... IKEv2, SSL/TLS, What about password-based key exchange? What about modeling symmetric encryption and message authentication as ideal functionalities?

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Cryptography and Privacy Preserving Operations Lecture 1 PowerPoint PPT Presentation

Cryptography and Privacy Preserving Operations Lecture 1 - If Alice wants to approve and Eve does not interfere Bob moves to state Y. If Alice does not approve, then for any behavior from Eve, Bob stays in N ...

If Alice wants to approve and Eve does not interfere Bob moves to state Y. If Alice does not approve, then for any behavior from Eve, Bob stays in N ...

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MD5 - MD5 Message Digest 5 Strengthened version of MD4 Significant differences from MD4 are 4 rounds, 64 steps (MD4 has 3 rounds, 48 steps) Unique additive constant each ...

MD5 Message Digest 5 Strengthened version of MD4 Significant differences from MD4 are 4 rounds, 64 steps (MD4 has 3 rounds, 48 steps) Unique additive constant each ...

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Cryptography Overview PowerPoint PPT Presentation

Cryptography Overview - Cryptography Overview John Mitchell Types of symmetric ... [ Wei Dai ] Pentium 4, 2.1 GHz ( on Windows XP SP1, Visual C++ 2003 ) ...

Cryptography Overview John Mitchell Types of symmetric ... [ Wei Dai ] Pentium 4, 2.1 GHz ( on Windows XP SP1, Visual C++ 2003 ) ...

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Modern Cryptography Lecture 13 PowerPoint PPT Presentation

Modern Cryptography Lecture 13 - Modern Cryptography Lecture 13 Yongdae Kim Hash Tree B1 H8 B2 H9 H4 B3 H10 B4 H11 H5 H2 B5 H12 B6 H13 H6 B7 H14 B8 H15 H7 H3 H1 Hi = h ( H2i, H2i+1) Temporal Key ...

Modern Cryptography Lecture 13 Yongdae Kim Hash Tree B1 H8 B2 H9 H4 B3 H10 B4 H11 H5 H2 B5 H12 B6 H13 H6 B7 H14 B8 H15 H7 H3 H1 Hi = h ( H2i, H2i+1) Temporal Key ...

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Collision Resistant Hashing: Can Composition Help PowerPoint PPT Presentation

Collision Resistant Hashing: Can Composition Help - Collision Resistant Hashing: Can Composition Help? Dan Boneh. Joint work with Xavier Boyen ... Used for digital signatures, e.g. certs. Note: not needed for HMAC ...

Collision Resistant Hashing: Can Composition Help? Dan Boneh. Joint work with Xavier Boyen ... Used for digital signatures, e.g. certs. Note: not needed for HMAC ...

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Cryptographic Hashing PowerPoint PPT Presentation

Cryptographic Hashing - ... rump session, CRYPTO'04] Collisions in reduced-round SHA-1 [Biham, rump session] ... [Wang et al., rump session] Collisions in SHA-1 (262 work) [Wang et al. ...

... rump session, CRYPTO'04] Collisions in reduced-round SHA-1 [Biham, rump session] ... [Wang et al., rump session] Collisions in SHA-1 (262 work) [Wang et al. ...

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Some Current Thinking on Hash Functions Within NIST PowerPoint PPT Presentation

Some Current Thinking on Hash Functions Within NIST - Migration to SHA256 and truncated SHA256. A few special-purpose workarounds ... Truncated SHA256 (SHA-x): Drop in replacement for SHA1 and maybe MD5 ...

Migration to SHA256 and truncated SHA256. A few special-purpose workarounds ... Truncated SHA256 (SHA-x): Drop in replacement for SHA1 and maybe MD5 ...

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Evoting by ZeroKnowledge PowerPoint PPT Presentation

Evoting by ZeroKnowledge - Definition [STORK report, May 2003, editor: Phong Q. Nguyen] An electronic ... Crptographic E-voting requirements [STORK] Eligibility. Privacy/anonymity ...

Definition [STORK report, May 2003, editor: Phong Q. Nguyen] An electronic ... Crptographic E-voting requirements [STORK] Eligibility. Privacy/anonymity ...

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On the Compressibility of NP instances and Cryptographic Applications, PowerPoint PPT Presentation

On the Compressibility of NP instances and Cryptographic Applications, - Commitment Schemes Hiding: A ... v21i, , hvm0, vm1 i To broadcast a single bit b to a subset T [m] Choose corresponding ... (Quantum computers?) New ...

Commitment Schemes Hiding: A ... v21i, , hvm0, vm1 i To broadcast a single bit b to a subset T [m] Choose corresponding ... (Quantum computers?) New ...

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Cryptography and Privacy Preserving Operations Lecture 2: Pseudo-randomness PowerPoint PPT Presentation

Cryptography and Privacy Preserving Operations Lecture 2: Pseudo-randomness - ... way function is guaranteed to exist, can construct an O(n2 log n) one-way function g: ... zk =rk x. A. y,r2. y,rk. z1, z2, zk. y. Check whether f(xi)=y ...

... way function is guaranteed to exist, can construct an O(n2 log n) one-way function g: ... zk =rk x. A. y,r2. y,rk. z1, z2, zk. y. Check whether f(xi)=y ...

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Generic and Practical Resettable ZeroKnowledge in the Bare PublicKey Model PowerPoint PPT Presentation

Generic and Practical Resettable ZeroKnowledge in the Bare PublicKey Model - Generic and Practical Resettable Zero-Knowledge in the Bare Public-Key Model. Moti Yung ... The bare public-key (BPK) model. Concurrent verifier security in ...

Generic and Practical Resettable Zero-Knowledge in the Bare Public-Key Model. Moti Yung ... The bare public-key (BPK) model. Concurrent verifier security in ...

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Paillier Threshold Cryptography Web Service PowerPoint PPT Presentation

Paillier Threshold Cryptography Web Service - Paillier Threshold Cryptography Web Service by Brett Wilson Outline of the Talk Introduction/Motivation Related Work Design of Paillier Threshold Cryptography Web ...

Paillier Threshold Cryptography Web Service by Brett Wilson Outline of the Talk Introduction/Motivation Related Work Design of Paillier Threshold Cryptography Web ...

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Entropic uncertainty relations for anticommuting observables PowerPoint PPT Presentation

Entropic uncertainty relations for anticommuting observables - Entropic uncertainty relations for anti-commuting observables. Stephanie Wehner ... Collision entropy H2 (PX) = - log j2 X PX (j)2. Each measurement. Set of ...

Entropic uncertainty relations for anti-commuting observables. Stephanie Wehner ... Collision entropy H2 (PX) = - log j2 X PX (j)2. Each measurement. Set of ...

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About a new generation of block ciphers and hash functions DN and HDN PowerPoint PPT Presentation

About a new generation of block ciphers and hash functions DN and HDN - ... for Czech NSA, presents some parts of the projects ST20052006018 and ... HDN(512, 8192)-10 is roughly 3 times slower than SHA-512 (and Whirlpool) ...

... for Czech NSA, presents some parts of the projects ST20052006018 and ... HDN(512, 8192)-10 is roughly 3 times slower than SHA-512 (and Whirlpool) ...

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E-voting DITSCAP Project PowerPoint PPT Presentation

E-voting DITSCAP Project - ... that a given system is safe to operate (security-wise) in its given environment. ... that receive, process, store, display, or transmit DoD information regardless ...

... that a given system is safe to operate (security-wise) in its given environment. ... that receive, process, store, display, or transmit DoD information regardless ...

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Cryptographic Hash Functions - 1. Chapter 4. Cryptographic Hash Functions. 2. Outline. 4.1 Hash Functions and ... A cryptographic hash function can provide assurance of data integrity. ex: ...

1. Chapter 4. Cryptographic Hash Functions. 2. Outline. 4.1 Hash Functions and ... A cryptographic hash function can provide assurance of data integrity. ex: ...

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MD5 - Based on one collision, Wang's method was reverse engineered by Australian team ... Applies to intermediate values, Q i and Qi. Use Wang's signed difference. MD5 19 ...

Based on one collision, Wang's method was reverse engineered by Australian team ... Applies to intermediate values, Q i and Qi. Use Wang's signed difference. MD5 19 ...

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Private Matching PowerPoint PPT Presentation

Private Matching - Garbled values (w's) of his input values. Translation from garbled values of ... If Alice gets garbled values (w's) of her input values, she can compute the ...

Garbled values (w's) of his input values. Translation from garbled values of ... If Alice gets garbled values (w's) of her input values, she can compute the ...

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ELEC5616 computer and network security PowerPoint PPT Presentation

ELEC5616 computer and network security - Cryptography is the study of mathematical techniques related to the ... Intuitively: it is easier to put a jigsaw puzzle back together if you have the plans ...

Cryptography is the study of mathematical techniques related to the ... Intuitively: it is easier to put a jigsaw puzzle back together if you have the plans ...

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Key Encapsulation: An Emerging Paradigm for PublicKey Cryptography PowerPoint PPT Presentation

Key Encapsulation: An Emerging Paradigm for PublicKey Cryptography - none

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Ke Yang - For more complicated tasks, the parties may do more than just ... Parties: ... price buyer.price, then both parties should learn nothing more than ...

For more complicated tasks, the parties may do more than just ... Parties: ... price buyer.price, then both parties should learn nothing more than ...

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Strengthening Digital Signatures via Randomized Hashing PowerPoint PPT Presentation

Strengthening Digital Signatures via Randomized Hashing - Signatures remain secure even if off-line collision attacks against hash are successful ... needs collision resistance (same for r in the middle of msg) ...

Signatures remain secure even if off-line collision attacks against hash are successful ... needs collision resistance (same for r in the middle of msg) ...

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Damgard PowerPoint PPT Presentations