Linked Questions

4
votes
1answer
61k views

Is using “SHA-256 with RSA-2048 Encryption” a secure certificate hashing algorithm?

Is using "SHA-256 with RSA-2048 Encryption" a secure certificate hashing algorithm? I don't think it is. Two examples: nsa.gov [careers site] give.wfp.org
14
votes
2answers
3k views

Trying to understand RSA and it's terminology?

I get the gist of RSA but I'm mostly self taught so sometimes the phrases I picked to describe something don't match up with the widely accepted terminology. I'm trying to remedy this. I'm working ...
3
votes
1answer
7k views

Details of TLS certificate verification

I do understand the cryptography basics, but I am uncertain about the following three steps: Step 1: How to compute a TLS certificate Correct me if I am wrong: The certificate authority computes a ...
4
votes
1answer
2k views

How to verify a server key exchange packet

I have a problem between two ends of an SSL connection. The server sends ServerKeyExchange and the client says the server key exchange packet is not signed correctly, so I want to check the signature ...
1
vote
2answers
792 views

RSA and Psuedorandom Number Generator

I want to give a presentation on school about RSA encryption and decryption. I understand the basic of calculating a public and private key with two small prime numbers. And how to use those keys to ...
4
votes
1answer
604 views

Can OpenSSL decrypt the encrypted signature in an Amazon Alexa request to a web service?

OpenSSL newbie here. We're using OpenSSL to parse and verify the certificate and signature that Amazon's Alexa sends to external web services, following their list of requirements in the instructions ...
3
votes
2answers
1k views

Does asymmetric encryption guarantee data integrity?

I have some unusual size constraints for my data which may be relevant to the prescribed solution. The scenario is as follows. Secure server A generates 240 bytes of data that need to be consumed by ...
7
votes
1answer
1k views

How do certificates work in terms of encryption, hashing, and signing?

I think I might understand this stuff, but I want to be sure I've got the details correct. There is a lot of information out there on the high-level implementation of certificates, as well as the ...
1
vote
2answers
626 views

TLS and Java Client

I work with a Java client and server that our startup recently acquired with very limited access to devs who built it. There is very limited documentation. It seems that the Java client used to ...
3
votes
4answers
180 views

Asymmetric Encryption

I understand Asymmetric Encryption works by having the private key known only to your computer, while the public key is given by your computer to any computer that wants to communicate securely with ...
1
vote
3answers
192 views

What is the advantage of using a digital signature over simple asymmetric encryption?

If you're sending me a message, you can: a) Encrypt the message using your private key, and I can decrypt is using your public key. b) You can create a digital signature of your message, and then ...
0
votes
1answer
304 views

Signing and timestamping implementation

I am writing a software that records and stores data files. I want to digitally sign and time stamp these files so that I can assure that it's Contemporaneous and Attributable (to comply with 21 CFR ...
1
vote
1answer
437 views

Is algorithm used to sign defined by certificate?

Using pfx certificate to sign or cypher, the algorithm used (rsa-1_5, rsa-oaep-mgf1p, etc) is defined inside pfx certificate? Certificate has information about algorithms used? Or it's totally ...
1
vote
1answer
237 views

Server authentication during the SSL handshake

I have question regarding the server authentication during the SSL handshake. I am going to write this up as my understanding of the concept. Please feel free to point out any mistakes. We generate ...
2
votes
2answers
128 views

Is this a secure Digital Signature + Encryption method?

I am trying to wrap my head around Digital Signatures and how RSA Encryption supports them. And which order to do them along with what specifically to encrypt. So say we have Alice and Bob and a ...

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