Collaborate Disseminate
Short story…
IBM(now HCL) Domino have since way back a complete procedure to issue X509 client certificate as a login option to webserver. Back in 2010-ish it worked fine in both Firefox and Internet Explorer. The handling has 4 steps
A… Continue reading X509 Client certificate – before – XEnroll / Certenroll / KEYGEN
The question is what is an appropriate public/private key length in order to encrypt a 256-bit or 512-bit AES key without wasting bytes, and whether long public/private keys provide meaningful increase in security simply from being longer…. Continue reading Max message length when encrypting with public key [migrated]
I’m trying to get my head around this scenario. I understand that a private key can be used for signing a message to provide authentication and public key can be used for encrypting and its corresponding private key can be used to decrypt … Continue reading Digital Signature and Encryption Process / Hierarchy
how can I ensure that person X on website A is the same person who contacts me?
Here is my use case.
On website A I post message asking username X to contact me. Someone send me an email – how do I ensure it is the same person? Website A d… Continue reading Authenticate people online with simple public / private key scheme or similar
I have created a ECDSA key and now need to convert this to SSH2 key.
final KeyPairGenerator keyGen = KeyPairGenerator.getInstance("ECDSA");
ECGenParameterSpec params = new ECGenParameterSpec("secp384r1");
key… Continue reading Given a Java ECPublicKey ECDSA PublicKey, how can I build an SSH2 public key?
Can we be sure that a cleartext message that becomes encrypted by pgp or openpgp which is intended for one-or-more specific recipients doesn’t also get secretly decipherable by a third party? Since i understand we can target multiple recip… Continue reading Can secret recipients be included in PGP cryptography
In the process of finding RSA key pairs, we first find a e that is relatively prime to φ(n) (where n = p × q), and then find d such that e × d mod φ(n) = 1. Is d also relatively prime to φ(n), or not necessarily?
In practice, e is usually … Continue reading In RSA, is e and d technically equivalent? [migrated]
In the Debian 9 server I have, these are the least restrictive permissions I can set for SSH login with public key to work:
/home/user 775
/home/user/.ssh 775
/home/user/.ssh/authorized_keys … Continue reading Ubuntu vs. Debian SSH public key login
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.
A week ago I decrypted a crypt14 WhatsApp database file using this python script. But I accedientally deleted the original crypt14.
Now I want to restore my database. I have a decrypted msgsql.db file. How to encrypt msgsql.db back to cryp… Continue reading How to re-encrypt a Whatsapp db file? [migrated]