# Secure names for bit-strings

@inproceedings{Haber1997SecureNF, title={Secure names for bit-strings}, author={Stuart Haber and W. Scott Stornetta}, booktitle={Conference on Computer and Communications Security}, year={1997} }

The increasing use of digital documents, and the need to refer to them conveniently and unambiguously, raise an important question: can one “name” a digital document in a way that conveniently enables users to find it, and at the same time enables a user in possession of a document to be sure that it is indeed the one that is referred to by the name? One crucial piece of a complete solution to this problem would be a method that provides a cryptographically verifiable label for any bit-string…

## 119 Citations

### Bit Coin

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- Computer Science
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This work proposes a solution to the double-spending problem using a peer-to-peer network, where the network timestamps transactions by hashing them into an ongoing chain of hash-based proof-of-work, forming a record that cannot be changed without redoing the proof- of-work.

### On Provably Secure Time-Stamping Schemes

- Computer Science, MathematicsASIACRYPT
- 2004

It is observed that if the variety of possible shapes of hash-chains is polynomial, then the time-stamping scheme becomes provably secure, assuming that the underlying hash function is collision-resistant, and it is shown that conventional black-box techniques are unable to prove that chain-resistance follows from collision-Resistance.

### Optimally Tight Security Proofs for Hash-Then-Publish Time-Stamping

- Computer ScienceACISP
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This paper achieves a notably smaller loss of power 1.5, which is the first one efficient enough to allow meaningful security guarantees to be given for a globalscale time-stamping service based on 256 bit hash functions, which considerably increases the efficiency of possible practical solutions.

### Do Broken Hash Functions Affect the Security of Time-Stamping Schemes?

- Computer Science, MathematicsACNS
- 2006

It is shown by using explicit separation techniques that neither collision-resistance nor 2nd preimage resistance is necessary for secure time-stamping, and that server side hash functions can even be not one-way.

### Non-interactive Timestamping in the Bounded-Storage Model

- Computer Science, MathematicsJournal of Cryptology
- 2008

This paper shows that non-interactive timestamping is possible in the bounded-storage model, i.e., if the adversary has bounded storage, and a long random string is broadcast to all players, and an explicit construction that is secure against all bounded storage adversaries that run in polynomial time is given.

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A practical architecture is presented which provides time stamping services, both in terms of relative temporal authentication, based on a linear linking scheme, and of absolute temporal authentication based on publishing mechanisms as well as on a trusted time source, implemented using the emerging Web Services technology.

## References

SHOWING 1-10 OF 34 REFERENCES

### Collision Free Hash Functions and Public Key Signature Schemes

- Computer Science, MathematicsEUROCRYPT
- 1987

The ability of a hash function to improve security and speed of a signature scheme is discussed: for example, it can combine the RSA-system with a collision free hash function based on factoring to get a scheme which is more efficient and much more secure.

### The MD5 Message-Digest Algorithm

- Computer ScienceRFC
- 1990

The MD4 message digest algorithm takes an input message of arbitrary length and produces an output 128-bit "fingerprint" or "message digest", in such a way that it is (hopefully) computationally…

### The Security of Cipher Block Chaining

- Computer Science, MathematicsCRYPTO
- 1994

This work provides its first formal justification, showing the following general lemma: that cipher block chaining a pseudorandom function gives a Pseudo-Cipher Block Chaining function.

### Improving the Efficiency and Reliability of Digital Time-Stamping

- Computer Science
- 1993

Two schemes for digital time-stamping which rely on Cryptographic hash functions, which can be used both to report events succinctly, and to cause events based on documents without revealing their contents are proposed.

### Trusted distribution of software over the Internet

- Computer ScienceProceedings of the Symposium on Network and Distributed System Security
- 1995

Bellcore's Trusted Software Integrity (Betsi) System, an implementation of the design, is presented and a detailed design is provided.

### One-Way Group Actions

- Computer Science, MathematicsCRYPTO
- 1990

One-way group actions provides a unified theory for all the known bit commitment schemes that offer unconditional protection for the originator of the commitments, and for many of those that offer her statistical protection.

### RIPEMD-160: A Strengthened Version of RIPEMD

- Computer ScienceFSE
- 1996

A new version of RIPEMD with a 160-bit result is proposed, as well as a plug-in substitute for RIPEMd with a 128- bit result, and the software performance of several MD4-based algorithms is compared.

### The use of encryption to ensure the integrity of reusable software components

- Computer ScienceProceedings of 1994 3rd International Conference on Software Reuse
- 1994

This paper proposes a method for providing the assurance of the origin of candidate components and to assure that they have not been modified by third parties through the application of modern encryption techniques.

### One-way functions and pseudorandom generators

- Computer Science, MathematicsSTOC '85
- 1985

A weaker assumption about one-way functions is suggested, which is not only sufficient, but also necessary for the existence of pseudorandom generators.

### Cryptanalysis of MD5 Compress

- Computer Science
- 1996

An attack on the compress function of MD5 is reported, which is based on similar methods as previous attacks on RIPEMD, MD4 and the 256-bit extension of MD4 (see [4], [5]).