Questions tagged [certificateless-crypto]

Certificateless cryptography is a variant of ID-based cryptography intended to prevent the key escrow problem. Only a partial private key is generated by the key generation center (KGC) and the other part of the private key is chosen by and only known to the user. An additional public key is generated by the user, which, however does not need to be certified by any trusted party.

Filter by
Sorted by
Tagged with
1 vote
1 answer
105 views

How does one associate the actual identity of a person or organization with a decentralized ID?

In SSI (Self-Sovereign Identity), anyone can generate their own DID (Decentralized ID). No authority or authorization is needed to create one. Since a public key pair is associated with DID, the ...
user avatar
2 votes
0 answers
43 views

How are security proofs performed for Certificateless PEKS schemes?

I have been studying several CLPEKS (CertificateLess Public-key Encryption scheme with Keyword Search) schemes and I understand the security assumptions and the several types of security models used ...
user avatar
1 vote
0 answers
53 views

Certificateless Key Agreement

I'm studying Certificateless Cryptography and specifically I'm studying a scheme without pairings. I read a lot of time this paper (https://www.sciencedirect.com/science/article/pii/S0898122112002490)...
user avatar
  • 361
0 votes
1 answer
95 views

Elliptic Curves for Pairings

how can is possible to know if an elliptic curve is suitable for protocols that adopt pairing? For example, in Certificateless Cryptography with pairing, is it possible to know if all elliptic curves ...
user avatar
  • 361
2 votes
0 answers
54 views

Multi-Authority (KGC) Certificateless Cryptography

I'm thinking to a particular scenario where I'm adopting the certificateless cryptography (the generic schema) where I have 2 trusted nodes, that we can identify as: $KGC_1$, $KGC_2$. Furthermore, I ...
user avatar
  • 361
0 votes
2 answers
149 views

eavesdropping on sha 256 consist of two entries one is public is secure

If i need to use symmetric encryption(AES), sending the same message for many times with the same password and initial value is absolutely not secure(i don't use Public key exchange ((in first ...
user avatar
1 vote
2 answers
96 views

Discrete Logarithm Problem or just integer exponentiation problem?

In reading the following paper, https://ai2-s2-pdfs.s3.amazonaws.com/35eb/afbaab34223bca50a7be2f5915fddf918fc7.pdf Generate two primes $p$ and $q$ such that $q|p-1$. Pick a generator $g$ of $Z_p^{*}$...
user avatar
  • 313
1 vote
1 answer
127 views

Computational Assumption For the extended discrete logarithm

Choose randomly $P\in G_1, (s,a \in Z_q)$. let the attackers know $a,P$ and keep $s$ as secret. Also the following is given. $$sP,(a+s)^{-1}P$$ Individually, From $sP$, trying to reveal ($s$) will ...
user avatar
  • 313
2 votes
2 answers
2k views

Understanding Hash function notations

I am implementing a Certificateless Cryptography Algorithm by referencing the paper An Efficient Certificateless Encryption for Secure Data Sharing in Public Clouds. In this paper on page no. 4 during ...
user avatar
1 vote
1 answer
257 views

Certificateless cryptography Implementation

Hello guys I am trying to implement Certificateless Cryptography algorithm with reference to this base paper. Right now I am trying to implement the code in java. ...
user avatar
0 votes
1 answer
26 views

What will browser show when a user access website and website present certificate of some other domain with same top level domain [closed]

For example, User tries to access a.example.com and server presents abc.example.com with a.example.com not in SANs list. Will it be just a warning or an error?
user avatar
  • 3
1 vote
0 answers
140 views

How can user privacy be preserved in certificateless cryptography?

In certificateless cryptography, how can a user preserve his privacy from Key Generation Center? If the KGC becomes malicious, how can the user's privacy be preserved? I read "Privacy-Preserving ...
user avatar
  • 185
0 votes
0 answers
452 views

Example of CL PKC

I am trying to solve the example of algorithms of Certificateless Signature by manually and solving the mathematics of Algorithms but not succeed while doing mathematical calculations. Please ...
user avatar
  • 185
1 vote
1 answer
1k views

Can you explain partial private key extract algorithm in certificateless Public key cryptography?

Related to the algorithms of certificate-less Signature approach of Al-Riyami and Paterson… Why is there a need for a "partial private key extract algorithm"? Why should it be needed when calculating ...
user avatar
  • 185
3 votes
2 answers
2k views

Certificateless cryptography

While reading "Certificateless Public Key Cryptography" by Author Sattam S. Al-Riyami and Kenneth G. Paterson, they have considered generation of private keys by a Key Generation Center (KGC). If the ...
user avatar
  • 185