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.

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Cryptographic Key Management system [closed]

A multinational company has five regional offices around the globe, between which large amounts of confidential data are exchanged every day over the internal network. It also maintains a separate web ...
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How to understand security analysis of encryption algorithm based on identity based and certificateless cryptosystem?

I am trying to understand the security analysis of cryptographic algorithms mainly identity based and certificateless public key encryption algorithm. I am finding it hard to understand the ...
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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 ...
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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 ...
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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)...
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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 ...
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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 ...
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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 ...
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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 $Z_p^{*}$...
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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 ...
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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 ...
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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. ...
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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?
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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 ...
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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 ...
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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 ...
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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 ...