Public key cryptography describes all cryptographic algorithms which have a pair of keys, one key that performs encryption and one key that performs decryption. One of these keys is made available publicly, allowing anyone to send messages that only the holder of the private key can read. You should ...
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66 views
Tell me about non-MD5/SHA1 key fingerprints
I understand there are specifications for public-key fingerprints that use modern hash algorithms like SHA2. What are they?
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121 views
What would the Internet be like without public-key cryptography?
The functioning of the Internet as we know it nowadays depends very heavily on public-key cryptography, including several key root systems that depend on its asymmetric properties.
But what would it ...
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320 views
Why the following attack in common modulus RSA works?
Suppose that i share a common modulus $N$ with two users $u_1$ and $u_2$ with public, secret keys ($e_a,d_a$), ($e_b,d_b$).
Why then $gcd(V,e_b)=1$ where $V=d_a*e_a-1/$W and $W=gcd(e_b,d_a*e_a-1)$ ...
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167 views
What is a trapdoor permutation?
Can anyone explain to me what a trapdoor one-way permutation is? Is RSA a trapdoor one-way permutation?
Context: I was reading about ring signatures. On page 560, it describes steps to ...
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173 views
How does a client verify a server certificate?
As far as I know,
when I request a certificate from Verisign (for example), and after they approved that me is me, they create a certificate (for me) which contains the digital signature and public ...
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21 views
public key distribution from a central server [migrated]
I'm trying to code up a encrypted communication program. Originally I was thinking that I would use public key cryptography and then I would keep the public keys in a database where users could query ...
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64 views
how many bit flips current computers can carry per second? When brute force is hard?
How many bit flips the fastest current computers can accomplish per time unit? i.e per second. I am trying to find when brute force attacks are considered infeasible. The reason I chose bit flips is ...
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49 views
How compute encrypt and decrypt runtime for agorithm [closed]
I programming RSA algorithm is the following two function in java language in my thesis
...
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177 views
Cryptographic Protocol using NaCL
Why?
I wanted to add some security and privacy to a chat-type server for playing various games (with a few things that are done on the server to limit cheating). Going by the "Don't implement ...
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73 views
Cryptograpy library for Python [closed]
I was searching for libraries/modules for encryption of data and found a few such as M2Crypto and GNUTLS but both of them don't support CMAC which is what I wanted to use for authentication. Anyone ...
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46 views
Elliptic curve Cryptography [duplicate]
Possible Duplicate:
Can we use elliptic curve cryptography in wireless sensors?
How to map message character to point lies on Elliptic Curve? how to ecc used in wireless sensor networks? ...
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1answer
126 views
Why is proof-by-reduction needed (for Elgamal proof of security, for example)?
The textbook proof for Elgamal encryption basically reduces to the Decisional Diffie-Hellman assumption (DDH).
Elgamal:
$Gen(.): x \xleftarrow{R} \mathbb{Z}_p$; $Enc(m,g^x): r \xleftarrow{R} ...
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181 views
ECC Cryptography
I want to know th basic understanding of ECC algorithm for cryptography.But I am not aware of the algorithm so please any one give me the basic understanding of the algorithm.
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1answer
47 views
How to choose the appropriate public (i, m) and private (j, m) keys?
I studied some encryption and decryption and I have found some very interesting problem to solve on the internet. I hope I am writing to right site - there are so many in StackExchange otherwise I ...
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0answers
21 views
References on PKI [closed]
I hope this is the right forum. I don't see any PKI specific forum around here. Can somebody recommend some books/references on TLS/PKI? I am starting a project for secure document exchange among ...
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2answers
171 views
Where to store the private key and the public key in a communication protocol
I want to create a simple secured connection protocol over TCP/IP.
I just want to connect from my mobile device to a server securely.
Firstly I thought to use an SSL connection, but I changed my ...
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0answers
63 views
Certificateless Cryptography for Wireless Sensor Network [closed]
As we all know that ID-based cryptography has been implemented for wireless sensor networks, can we implement certifficateless cryptography over that? Discuss pros and cons.
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76 views
RSA decryption from ciphertext using private key [closed]
I am sniffing a client side application traffic and I found some encrypted data. I am not able to decrypt it. Information which I have is
Public Key:
...
