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Questions tagged [digital]

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2answers
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How to understand Authenticated Key Exchange?

I am reading some articles about Key Exchange. I know classic key exchange,such as Diffie-Hellman key Exchange. This type algorithm is vulnerable to man-in-the-middle attack. However, When using ...
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2answers
48 views

Difference between when select x from $\mathbb{Z}_{p-1}$ and $\mathbb{Z}_p$ in discrete logarithm Problem?

Reading "Security Arguments for Digital Signatures and Blind Signatures" paper, I confused by some questions. Q1. when it refers to "El Gamal signature scheme", The key generation algorithm: it ...
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0answers
60 views

Schnorr-signature calculating a coefficient

I need to create program that makes signature for selected file. I simplified algorithm a little, because I draw max 64 bit prime numbers instead of ...
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1answer
174 views

Message authentication vs entity authentication

Does message authentication authenticate the entity? If the answer is "No", because message authentications like MAC work with the shared symmetric key, then my second question is: Does a message ...
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1answer
307 views

RSA PSS security advantage

To my humble opinion, please correct me if I'm wrong, RSA-PSS (PKCS#1 ver 2.1) advantage over RSA as described in PKCS#1 ver. 1.5 is in its security proofs. Does this proof and the advantage is still ...
2
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1answer
54 views

is the functional signature result relies on f(x) or on x where x is a message and f is a function?

I am new on cryptography and I have a question about the functional signature scheme. The notion was introduced in this paper. In a functional signature scheme, there is a standard signature and ...
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0answers
69 views

ECIES Authentication

In the ECIES scheme, the sender generates an ephemeral public key per each message it encrypts. This public key, together with the receiver's private key, is used in order to generate a shared secret ...