356 Unforgeability PPTs View free & download

Seminar Presentation on Notions of Security PowerPoint PPT Presentation

Seminar Presentation on Notions of Security - Ms Laila El Aimani. 2. S M Masud Karim. Outline of the Talk ... Universal Unforgeability: The attacker, without necessarily having recovered sk, ...

Ms Laila El Aimani. 2. S M Masud Karim. Outline of the Talk ... Universal Unforgeability: The attacker, without necessarily having recovered sk, ...

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Security Issues in Mobile Communication Systems PowerPoint PPT Presentation

Security Issues in Mobile Communication Systems - Security Issues in Mobile Communication Systems. N. Asokan. Nokia ... minimize message sizes, number of messages. Increased risk ... service: unforgeability ...

Security Issues in Mobile Communication Systems. N. Asokan. Nokia ... minimize message sizes, number of messages. Increased risk ... service: unforgeability ...

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Secret Signatures: How to Achieve Business Privacy Efficiently PowerPoint PPT Presentation

Secret Signatures: How to Achieve Business Privacy Efficiently - Byoungcheon Lee1, Kim-Kwang Raymond Choo2, Jeongmo Yang1, Seungjae Yoo1 ... Nominative signature. Requires interactive protocol in signing stage ...

Byoungcheon Lee1, Kim-Kwang Raymond Choo2, Jeongmo Yang1, Seungjae Yoo1 ... Nominative signature. Requires interactive protocol in signing stage ...

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On the (Im)possibility of Blind Message Authentication Codes PowerPoint PPT Presentation

On the (Im)possibility of Blind Message Authentication Codes - User(pk, M) Sign(sk) s / reject. Verify(pk, M, s) 0/1 ... Tag(K) send pk to user, then execute Sign(sk) User(M) compare received pk to pk' in shared state ...

User(pk, M) Sign(sk) s / reject. Verify(pk, M, s) 0/1 ... Tag(K) send pk to user, then execute Sign(sk) User(M) compare received pk to pk' in shared state ...

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On the (Im)possibility of Blind Message Authentication Codes - On the (Im)possibility of Blind Message Authentication Codes Gregory Neven (Katholieke Universiteit Leuven & Ecole Normale Sup rieure) joint work with

On the (Im)possibility of Blind Message Authentication Codes Gregory Neven (Katholieke Universiteit Leuven & Ecole Normale Sup rieure) joint work with

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Digital Signature PowerPoint PPT Presentation

Digital Signature - Digital Signature. Sheng Zhong. 2. Digital Signature (1) Public-key-based technique for data integrity. A digital signature scheme is a tuple (PK, SK, M, S, KG, ...

Digital Signature. Sheng Zhong. 2. Digital Signature (1) Public-key-based technique for data integrity. A digital signature scheme is a tuple (PK, SK, M, S, KG, ...

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Certificate Based Linkable Ring Signature PowerPoint PPT Presentation

Certificate Based Linkable Ring Signature - Certificate Based (Linkable) Ring Signature. Man Ho Au, Willy Susilo, Tsz Hon Yuen ... ID-Based Problem of Key Escrow (Private Key Generator (PKG) is too powerful) ...

Certificate Based (Linkable) Ring Signature. Man Ho Au, Willy Susilo, Tsz Hon Yuen ... ID-Based Problem of Key Escrow (Private Key Generator (PKG) is too powerful) ...

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Blind Signatures: Definitions and Constructions PowerPoint PPT Presentation

Blind Signatures: Definitions and Constructions - Enables a user to obtain a signature from a signer on a message ... Motivation: e-cash, e-voting ... Example: e-cash (simplified) Bank has public key PK. User: ...

Enables a user to obtain a signature from a signer on a message ... Motivation: e-cash, e-voting ... Example: e-cash (simplified) Bank has public key PK. User: ...

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Secure and Practical lottery protocol using bank as a notary PowerPoint PPT Presentation

Secure and Practical lottery protocol using bank as a notary - ICE 615 Network Security Term project Progressive Report Secure and Practical lottery protocol using bank as a notary Sep. 13, 2001 2001140 C&IS lab.

ICE 615 Network Security Term project Progressive Report Secure and Practical lottery protocol using bank as a notary Sep. 13, 2001 2001140 C&IS lab.

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Lecturer: Moni Naor PowerPoint PPT Presentation

Lecturer: Moni Naor - Zero-knowledge Interactive Proofs. Interactive Proofs and the ... A goal in itself: Sudoku example. www.wisdom.weizmann.ac.il/~naor/PAPERS/SUDOKU_DEMO ...

Zero-knowledge Interactive Proofs. Interactive Proofs and the ... A goal in itself: Sudoku example. www.wisdom.weizmann.ac.il/~naor/PAPERS/SUDOKU_DEMO ...

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An Efficient Online Electronic Cash with Unlinkable Exact Payments PowerPoint PPT Presentation

An Efficient Online Electronic Cash with Unlinkable Exact Payments - e-cash: By circulating information called coin, a payment from a user to a ... coin amount is kept secret, but correctness of amounts of old and new coins is ...

e-cash: By circulating information called coin, a payment from a user to a ... coin amount is kept secret, but correctness of amounts of old and new coins is ...

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PAR: Payment for Anonymous Routing PowerPoint PPT Presentation

PAR: Payment for Anonymous Routing - Why do we need payment in Tor? Other payment systems. PAR payment system overview ... Sybil Attack. Recent Developments in Cryptography and Information Security ...

Why do we need payment in Tor? Other payment systems. PAR payment system overview ... Sybil Attack. Recent Developments in Cryptography and Information Security ...

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Ring Signatures of Sublinear Size without Random Oracles PowerPoint PPT Presentation

Ring Signatures of Sublinear Size without Random Oracles - ... authority can select h of order q. Key generation: vi = gxi , hi ... Relies on composite order bilinear groups. subgroup decision. strong Diffie-Hellman in Gp ...

... authority can select h of order q. Key generation: vi = gxi , hi ... Relies on composite order bilinear groups. subgroup decision. strong Diffie-Hellman in Gp ...

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OceanStore: An Architecture for Global-Scale Persistent Storage PowerPoint PPT Presentation

OceanStore: An Architecture for Global-Scale Persistent Storage - Want: Geographic independence for availability, durability, and freedom to adapt ... Promiscuous Caching: Data may be cached anywhere, anytime ...

Want: Geographic independence for availability, durability, and freedom to adapt ... Promiscuous Caching: Data may be cached anywhere, anytime ...

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Lecturer: Moni Naor - Foundations of Privacy Formal Lecture Zero-Knowledge and Deniable Authentication Lecturer: Moni Naor Giving talks Advice on giving Academic Talks Giving an Academic ...

Foundations of Privacy Formal Lecture Zero-Knowledge and Deniable Authentication Lecturer: Moni Naor Giving talks Advice on giving Academic Talks Giving an Academic ...

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Digital signature in automatic analyses for confidentiality against active adversaries PowerPoint PPT Presentation

Digital signature in automatic analyses for confidentiality against active adversaries - Digital signature in automatic analyses for confidentiality against ... Adversary is active - it schedules the participants and relays messages between them ...

Digital signature in automatic analyses for confidentiality against ... Adversary is active - it schedules the participants and relays messages between them ...

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Cryptography and Complexity at the Weizmann Institute PowerPoint PPT Presentation

Cryptography and Complexity at the Weizmann Institute - Parallelism. Randomness. Identify problems that are infeasible to compute by any reasonable machine ... Taxonomy: classify problems into classes with similar ...

Parallelism. Randomness. Identify problems that are infeasible to compute by any reasonable machine ... Taxonomy: classify problems into classes with similar ...

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What have we learnt so far PowerPoint PPT Presentation

What have we learnt so far - Security (can an attacker cheat?) Adversarial modeling. Rational attackers (only cheat for a benefit) vs. malicious attackers (ok to ...

Security (can an attacker cheat?) Adversarial modeling. Rational attackers (only cheat for a benefit) vs. malicious attackers (ok to ...

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Multi-Party Contract Signing PowerPoint PPT Presentation

Multi-Party Contract Signing - Multi-Party Contract Signing Sam Hasinoff April 9, 2001 References Round-optimal and Abuse-free Optimistic Multi-Party Contract Signing (Waidner and Waidner, ICALP ...

Multi-Party Contract Signing Sam Hasinoff April 9, 2001 References Round-optimal and Abuse-free Optimistic Multi-Party Contract Signing (Waidner and Waidner, ICALP ...

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Reaching Approximate Agreement in an Asynchronous Environment PowerPoint PPT Presentation

Reaching Approximate Agreement in an Asynchronous Environment - The Turks are besieging the city of Constantinople, A.K.A Byzantine. The Muslim generals ... Introduced by Lamport, Pease and Shostak, 80-82 ...

The Turks are besieging the city of Constantinople, A.K.A Byzantine. The Muslim generals ... Introduced by Lamport, Pease and Shostak, 80-82 ...

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OceanStore Toward Global-Scale, Self-Repairing, Secure and Persistent Storage PowerPoint PPT Presentation

OceanStore Toward Global-Scale, Self-Repairing, Secure and Persistent Storage - OceanStore Toward Global-Scale, Self-Repairing, Secure and Persistent Storage John Kubiatowicz University of California at Berkeley

OceanStore Toward Global-Scale, Self-Repairing, Secure and Persistent Storage John Kubiatowicz University of California at Berkeley

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OceanStore Global-Scale Persistent Storage PowerPoint PPT Presentation

OceanStore Global-Scale Persistent Storage - Responsible Party: ... Birthday paradox requires over 280 unique objects before collisions worrisome ... submitted to Responsible Party which chooses a final ...

Responsible Party: ... Birthday paradox requires over 280 unique objects before collisions worrisome ... submitted to Responsible Party which chooses a final ...

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OceanStore Global-Scale Persistent Storage - Rapid growth of bandwidth in the interior of the net. Broadband to the ... Want: Geographic independence for availability, durability, and ... Like hologram ...

Rapid growth of bandwidth in the interior of the net. Broadband to the ... Want: Geographic independence for availability, durability, and ... Like hologram ...

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Crosssite request forgery PowerPoint PPT Presentation

Crosssite request forgery - Referer: http://www.facebook.com/home.php. X-Requested-By: XMLHttpRequest ... Rails vs. Login CSRF. Login CSRF Fails. CLIENT-SIDE DEFENSES. Can browsers help ...

Referer: http://www.facebook.com/home.php. X-Requested-By: XMLHttpRequest ... Rails vs. Login CSRF. Login CSRF Fails. CLIENT-SIDE DEFENSES. Can browsers help ...

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A novel proxy key generation protocol and its application PowerPoint PPT Presentation

A novel proxy key generation protocol and its application - Periodical: Computer Standards & Interfaces 29 ... (W,Sw) is an ID-based key pair. Sw = S2-Sp = (Sk Sp)-Sp = Sk = tQw = tH1(W) ... Sw = tH1(W) S2 = Sw Sp ...

Periodical: Computer Standards & Interfaces 29 ... (W,Sw) is an ID-based key pair. Sw = S2-Sp = (Sk Sp)-Sp = Sk = tQw = tH1(W) ... Sw = tH1(W) S2 = Sw Sp ...

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Hybrid Signcryption with Outsider Security PowerPoint PPT Presentation

Hybrid Signcryption with Outsider Security - Hybrid encryption ... Hybrid signcryption ... It's easy to build efficient, provably secure hybrid signcryption schemes. ...

Hybrid encryption ... Hybrid signcryption ... It's easy to build efficient, provably secure hybrid signcryption schemes. ...

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Digital Signature Preliminary RSA signature scheme ElGamal signature scheme DSA signature scheme PowerPoint PPT Presentation

Digital Signature Preliminary RSA signature scheme ElGamal signature scheme DSA signature scheme - A signature is a commitment (or binding) of a person to a document. Dear John: ... Output yes if and only if gh'yrrs mod p. 2001/12/26. Network Security. 10 ...

A signature is a commitment (or binding) of a person to a document. Dear John: ... Output yes if and only if gh'yrrs mod p. 2001/12/26. Network Security. 10 ...

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Foundations of Cryptography Lecture 6 PowerPoint PPT Presentation

Foundations of Cryptography Lecture 6 - Strongly Universal One-Way Hash. Definition and ... E.g. chopping last bit of input. Consider the (n, n-1)-family G where each g G is defined by h H ...

Strongly Universal One-Way Hash. Definition and ... E.g. chopping last bit of input. Consider the (n, n-1)-family G where each g G is defined by h H ...

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Secure and Practical lottery protocol using bank as a notary - England (Football Pools,1923), France (Loto Foot), Italia (TotoCalcio, TotoGoal) ... A.Shamir, How to share a secret, CACM 22, pp.612-613, 1979. ...

England (Football Pools,1923), France (Loto Foot), Italia (TotoCalcio, TotoGoal) ... A.Shamir, How to share a secret, CACM 22, pp.612-613, 1979. ...

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OceanStore: An Architecture for GlobalScale Persistent Storage - Exploit multicast for quicker consistency when possible. Promiscuous Caching: ... release consistency (build and use MCS-style locks) Extremely loose (weak) ...

Exploit multicast for quicker consistency when possible. Promiscuous Caching: ... release consistency (build and use MCS-style locks) Extremely loose (weak) ...

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6.897: Selected Topics in Cryptography Lectures 13 and 14 PowerPoint PPT Presentation

6.897: Selected Topics in Cryptography Lectures 13 and 14 - 6.897: Selected Topics in Cryptography Lectures 13 and 14 Lecturers: Ran Canetti, Ron Rivest Scribes?

6.897: Selected Topics in Cryptography Lectures 13 and 14 Lecturers: Ran Canetti, Ron Rivest Scribes?

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What have we learnt so far - What to do with them: design signature schemes, broadcast authentication, ... Steal money, perform money laundry, obtain insider information, hack into a system. ...

What to do with them: design signature schemes, broadcast authentication, ... Steal money, perform money laundry, obtain insider information, hack into a system. ...

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Implementing eAuctions with Sharemind PowerPoint PPT Presentation

Implementing eAuctions with Sharemind - One of the main forms of selling, buying and exchanging goods ... Discriminative auction, Non-discriminative --Combinatorial and Walrasian Auction ...

One of the main forms of selling, buying and exchanging goods ... Discriminative auction, Non-discriminative --Combinatorial and Walrasian Auction ...

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Traceable Signatures PowerPoint PPT Presentation

Traceable Signatures - The state of things in multi-user environments: ... Forges a traceable signature that. EITHER. Does open to one of the good users. OR ...

The state of things in multi-user environments: ... Forges a traceable signature that. EITHER. Does open to one of the good users. OR ...

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An Efficient Signcryption Scheme with Key Privacy PowerPoint PPT Presentation

An Efficient Signcryption Scheme with Key Privacy - MPhil Student in CS Department. City University of Hong Kong ... J. Beak, R. Steinfeld, and Y. Zheng. Formal proofs for the security of signcryption. ...

MPhil Student in CS Department. City University of Hong Kong ... J. Beak, R. Steinfeld, and Y. Zheng. Formal proofs for the security of signcryption. ...

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An Efficient and Secure Event Signature EASES Protocol for PeertoPeer Massively Multiplayer Online G PowerPoint PPT Presentation

An Efficient and Secure Event Signature EASES Protocol for PeertoPeer Massively Multiplayer Online G - An Efficient and Secure Event Signature (EASES) Protocol for ... Play the paper, scissors, rock game remotely without arbiter. 9. Background hash function ...

An Efficient and Secure Event Signature (EASES) Protocol for ... Play the paper, scissors, rock game remotely without arbiter. 9. Background hash function ...

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Proving%20Security%20of%20Industrial%20Network%20Protocols:%20Theory%20and%20Practice PowerPoint PPT Presentation

Proving%20Security%20of%20Industrial%20Network%20Protocols:%20Theory%20and%20Practice - Sound wrt symbolic and computational cryptographic models ... Challenge-Response Property. Specifying authentication for Initiator using PCL syntax ...

Sound wrt symbolic and computational cryptographic models ... Challenge-Response Property. Specifying authentication for Initiator using PCL syntax ...

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Multicast Security: A Taxonomy and Some Efficient Constructions PowerPoint PPT Presentation

Multicast Security: A Taxonomy and Some Efficient Constructions - Each recipient u verifies the all MACs which were created with keys in Ru. ... How to manage keys when a user leaves a group? ...

Each recipient u verifies the all MACs which were created with keys in Ru. ... How to manage keys when a user leaves a group? ...

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Protocol Composition Logic II PowerPoint PPT Presentation

Protocol Composition Logic II - Could break: Bob's signature from one protocol could be used to attack another ... AES based using above keys (Shared Secret-PMK) Laptop. Access Point. Auth Server ...

Could break: Bob's signature from one protocol could be used to attack another ... AES based using above keys (Shared Secret-PMK) Laptop. Access Point. Auth Server ...

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Protocole de vote E-Poll R PowerPoint PPT Presentation

Protocole de vote E-Poll R - Vote assist par ordinateur, mais dans un bureau de vote pour le vote ... Votes exclusifs sur syst mes E-Poll : Cremona, Ladispoli, Czestochova, Ladispoli ...

Vote assist par ordinateur, mais dans un bureau de vote pour le vote ... Votes exclusifs sur syst mes E-Poll : Cremona, Ladispoli, Czestochova, Ladispoli ...

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CSE331: Introduction to Networks and Security PowerPoint PPT Presentation

CSE331: Introduction to Networks and Security - Project 3 is due on Monday Nov. 18th. 4th individual ... Interpreters. Check the execution of. every instruction. Hard to mediate high-level. abstractions ...

Project 3 is due on Monday Nov. 18th. 4th individual ... Interpreters. Check the execution of. every instruction. Hard to mediate high-level. abstractions ...

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Public Key Cryptography in the Bounded Retrieval Model PowerPoint PPT Presentation

Public Key Cryptography in the Bounded Retrieval Model - Key size dependent on security parameter (e.g. 1024 bits) ... Other efficiency parameters only depend on k. ... bound L. Security parameter k. Secret key size: ...

Key size dependent on security parameter (e.g. 1024 bits) ... Other efficiency parameters only depend on k. ... bound L. Security parameter k. Secret key size: ...

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Time - Why is synchronization so complicated? ... External Clock Synchronization. Synchronize clocks with respect to an external time reference: usually useful in ...

Why is synchronization so complicated? ... External Clock Synchronization. Synchronize clocks with respect to an external time reference: usually useful in ...

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PCL: A Logic for Proving Security of Industrial Network Protocols PowerPoint PPT Presentation

PCL: A Logic for Proving Security of Industrial Network Protocols - Logic and programming languages, specification and verification, cryptography, ... Formulated by Datta, Derek, Durgin, Mitchell, Pavlovic. Example: Challenge-Response ...

Logic and programming languages, specification and verification, cryptography, ... Formulated by Datta, Derek, Durgin, Mitchell, Pavlovic. Example: Challenge-Response ...

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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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Consensus and Reliable Broadcast PowerPoint PPT Presentation

Consensus and Reliable Broadcast - Termination Every correct process eventually delivers some message ... A process that receives a proposed message in round 1, relays it to others ...

Termination Every correct process eventually delivers some message ... A process that receives a proposed message in round 1, relays it to others ...

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Topics in Cryptography Lecture 4 Topic: Chosen Ciphertext Security PowerPoint PPT Presentation

Topics in Cryptography Lecture 4 Topic: Chosen Ciphertext Security - Example: Auctions. Different requirements - different notions. ... If key is used for a single auction and secrecy is not required after the auction is over ...

Example: Auctions. Different requirements - different notions. ... If key is used for a single auction and secrecy is not required after the auction is over ...

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CryptographySecurity PowerPoint PPT Presentation

CryptographySecurity - ... scheme (Discrete Logarithm) (American, DSS(DSA) scheme) ... Signature schemes based on elliptic curves. Appendix: Various types. Schemes for multi-user: ...

... scheme (Discrete Logarithm) (American, DSS(DSA) scheme) ... Signature schemes based on elliptic curves. Appendix: Various types. Schemes for multi-user: ...

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OceanStore: In Search of GlobalScale, Persistent Storage PowerPoint PPT Presentation

OceanStore: In Search of GlobalScale, Persistent Storage - Rapid growth of bandwidth in the interior of the net. Broadband to the ... Cross-administrative domain. Metric: MOLE OF BYTES (6 1023) OceanStore:4. FDIS 2002 ...

Rapid growth of bandwidth in the interior of the net. Broadband to the ... Cross-administrative domain. Metric: MOLE OF BYTES (6 1023) OceanStore:4. FDIS 2002 ...

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OceanStore Toward GlobalScale, SelfRepairing, Secure and Persistent Storage - OceanStore. Toward Global-Scale, Self-Repairing, Secure and Persistent ... Rapid growth of bandwidth in the interior of the net. Broadband to ... hologram ...

OceanStore. Toward Global-Scale, Self-Repairing, Secure and Persistent ... Rapid growth of bandwidth in the interior of the net. Broadband to ... hologram ...

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Electronic Voting PowerPoint PPT Presentation

Electronic Voting - ... and papers of: Schoenmakers, Benaloh, Fiat, Adida, Reynolds, Ryan and Chaum ... Reynolds' Scheme. Voter enters the booth and receives a blank ballot. ...

... and papers of: Schoenmakers, Benaloh, Fiat, Adida, Reynolds, Ryan and Chaum ... Reynolds' Scheme. Voter enters the booth and receives a blank ballot. ...

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Computer Security CS 426 Lecture 10 PowerPoint PPT Presentation

Computer Security CS 426 Lecture 10 - operating-system level virtualization, e.g., chroot, jail, etc. ... Horse is rogue software installed, perhaps unwittingly, by duly authorized users ...

operating-system level virtualization, e.g., chroot, jail, etc. ... Horse is rogue software installed, perhaps unwittingly, by duly authorized users ...

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Current issues of ecash and Fair tracing PowerPoint PPT Presentation

Current issues of ecash and Fair tracing - Current issues of e-cash and Fair tracing. Network Security Term Project ... 2. The Bank checks the signature and if it is valid, credits the Vendor's account ...

Current issues of e-cash and Fair tracing. Network Security Term Project ... 2. The Bank checks the signature and if it is valid, credits the Vendor's account ...

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NonMalleable Encryption From Any Semantically Secure One PowerPoint PPT Presentation

NonMalleable Encryption From Any Semantically Secure One - Non-Malleable Encryption From Any Semantically Secure One ... Many well-known cryptosystems are easily malleable. GM Encryption: Enc(0) = r2, Enc(1) = yr2. ...

Non-Malleable Encryption From Any Semantically Secure One ... Many well-known cryptosystems are easily malleable. GM Encryption: Enc(0) = r2, Enc(1) = yr2. ...

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Foundations of Cryptography Lecture 1: Introduction, Identification, One-way functions PowerPoint PPT Presentation

Foundations of Cryptography Lecture 1: Introduction, Identification, One-way functions - Identification, Authentication and encryption ... Universal one-way functions, multiple identifications, ... Does High Entropy Suffice for Identification? ...

Identification, Authentication and encryption ... Universal one-way functions, multiple identifications, ... Does High Entropy Suffice for Identification? ...

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Chapter 7: Digital signatures PowerPoint PPT Presentation

Chapter 7: Digital signatures - IV054 Chapter 7: Digital signatures Digital signatures are one of the most important inventions/applications of modern cryptography. The problem is how can a user ...

IV054 Chapter 7: Digital signatures Digital signatures are one of the most important inventions/applications of modern cryptography. The problem is how can a user ...

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Unforgeability PowerPoint PPT Presentations