Collaborate Disseminate
If using asymmetric encryption, such as ES256, is there a reason why a private key could not be discarded after signing some data?
For example with a JWT, or a file hash use for audit at a later date, is keeping the private key necessary? … Continue reading Key management: Can I delete private key in asymmetric encryption?
I have a web application created with Flask in python that uses asymmetric encryption using RSA, the private key is generated from the user’s password and is only stored in a cookie on the user’s device, so even I as the person who has acc… Continue reading Asymmetric encryption and data sharing
My studying material states that although symmetric ciphers can be either block or stream ciphers, it also states that asymmetric can only be block ciphers without further clarification.
Continue reading Why is it impossible for assymetric ciphers to be stream ciphers?
My studying material states that although symmetric ciphers can be either block or stream ciphers, it also states that asymmetric can only be block ciphers without further clarification.
Continue reading Why is it impossible for assymetric ciphers to be stream ciphers?
My studying material states that although symmetric ciphers can be either block or stream ciphers, it also states that asymmetric can only be block ciphers without further clarification.
Continue reading Why is it impossible for assymetric ciphers to be stream ciphers?
We want to wrap / encapsulate
a symmetric key with an asymmetric keypair,
a symmetric key with a symmetric key,
a private key with a symmetric key.
In each case, we’d like to allow several keys to be wrapped / encapsulated with the same … Continue reading How to use (py)NaCl/libsodium for key wrap, key encapsulation
Both hosts have just their public and private key pair (but they do not have the other party’s public key).
Bob should be authenticated
Assume that the two hosts share clocks that are synced, i.e timestamps can be used.
I have not found … Continue reading How can Alice ping and authenticate Bob without any of them sharing their public keyes beforehand
I would like to preface this with the information that I am clearly not well versed in crypto, so my understand so far may not be accurate.
CISA recently published an advisory Preparing Critical Infrastructure for Post-Quantum Cryptography… Continue reading Will the public-key cryptosystem change in a post-quantum state?
Is it possible to swap them, so that the public key is kept secret while the private key is public? Or do they actually function differently?
Thinking specifically about DSA though I’m interested if there is a general answer.
How do you create a private-key/public-key pair without the public key’s information in the private key? So you should basically not be able to extract the public key from the private key. The private key should contain the bare minimum.
I… Continue reading Create "bare" pgp private key / Make private key without being able to generate the public key from it