kandi X-RAY | RSA Summary
kandi X-RAY | RSA Summary
RSA encryption and decryption Algorithms in C Language. ---RSA加解密算法的演示，C语言实现。
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I know there are some other questions (with answers) to this topic. But no of these was helpful for me.
I have a postfix server (postfix 3.4.14 on debian 10) with following configuration (only the interesting section):...
ANSWERAnswered 2021-Jun-15 at 08:30
Here I'm wondering about the line [in s_client]
New, TLSv1/SSLv3, Cipher is ECDHE-RSA-AES256-GCM-SHA384
You're apparently using OpenSSL 1.0.2, where that's a basically useless relic. Back in the days when OpenSSL supported SSLv2 (mostly until 2010, although almost no one used it much after 2000), the ciphersuite values used for SSLv3 and up (including all TLS, but before 2014 OpenSSL didn't implement higher than TLS1.0) were structured differently than those used for SSLv2, so it was important to qualify the ciphersuite by the 'universe' it existed in. It has almost nothing to do with the protocol version actually used, which appears later in the session-param decode:
I want to encrypt files fore secure storage, but the problem is, I don't know how to store the key to decrypt the files afterwards.
ANSWERAnswered 2021-Jan-03 at 15:18
The way you're encrypting data makes no sense. Asymmetric encryption can only encrypt a small, fixed amount of data. Never use asymmetric encryption such as RSA-OAEP for anything other than a symmetric key, and use that symmetric key to encrypt the actual data. For the symmetric encryption, use a proper AEAD mode such as AES-GCM or ChaCha20-Poly1305. This is called hybrid encryption.
Other things that are wrong with your code:
- A 1024-bit RSA key is not enough for security: 2048-bit is a minimum, and you should prepare to move away from RSA because its key sizes don't scale well. (Feel free to use 1024-bit keys for testing and learning, just don't use anything less than 2048-bit for RSA in production.)
- The encryption is a binary format, but you join up lines as if they were text. Text or binary: pick one. Preferably use a well-known format such as ASN.1 (complex but well-supported) for binary data or JSON for text. If you need to encode binary data in a text format, use Base64.
If this is for real-world use, scrap this and use NaCl or libsodium. In Python, use a Python wrapper such as libnacl, PyNaCl, pysodium or csodium. Use a public-key box. The Python APIs are slightly different for each Python wrapper, but all include a way to export the keys.
If this is a learning exercise, read up on hybrid encryption. Look inside libsodium to see how to do it correctly. Key import and export is done with the methods
export_key. Symmetric encryption starts with
Crypto.Cipher.AES.new(key, Crypto.Cipher.AES.MODE_GCM) or
Crypto.Cipher.AES.new(key, Crypto.Cipher.AES.MODE_GCM, nonce=nonce) or
Crypto.Cipher.ChaCha20_Poly1305.new(key, nonce=nonce) for decryption).
I am a member of my company organization. SSH keys associated with my account. Nothing works as expected. I am trying to push my branch...
ANSWERAnswered 2021-Jun-15 at 07:34
First, make sure that https://github.com/mycomp/repo-pr does exist (meaning the case, uper or lower, of the URL is correct)
Second, check that you are correctly authenticated by GitHub through SSH:
i try decrypt using opensll on php. Required algorithm is rsa-oaep with sha256. what do i need to write for $cipher_algo?...
ANSWERAnswered 2021-Jun-10 at 06:28
You need the library https://phpseclib.com/ to get the following code to run (I'm using version 3).
Kindly note that there is no exception handling on the code.
This is an output:
I am new to Spark and am trying to run on a hadoop cluster a simple spark jar file built through maven in intellij. But I am getting classnotfoundexception in all the ways I tried to submit the application through spark-submit.
ANSWERAnswered 2021-Jun-14 at 09:36
You need to add scala-compiler configuration to your
pom.xml. The problem is without that there is nothing to compile your SparkTrans.scala file into java classes.
I have a gitlab ce image running via docker-compose...
ANSWERAnswered 2021-Jun-14 at 09:31
To be able to connect with ssh, I had to add the following lines in the GITLAB_OMNIBUS_CONFIG environment variable :
We develop an application with VuejS in front and an api Nodejs(Restify) in back. We use a third party for give us authentification (Identity provider with OpenId Connect protocole).
So with VueJs we can authenticate, get an access_token and id_token and we pass it in each nodejs request header with bearer.
Now we need to verify,in back, if this token is valid and if the user can access this routes.
Our Identity provider give us an endpoint (jwks_uri) with a keys like:...
ANSWERAnswered 2021-Jun-04 at 17:54
I believe the optimal way for small to medium sized application is just to make jwt verification work as a middleware. Something like:
I've created an
SSH key (on PC A) to access my GitHub repo (works correctly). Then I copied this key to PC B. For some reason, I can't access the repo from the PC B even if the public and private keys are the same.
ANSWERAnswered 2021-Jun-13 at 05:03
Could the reason be the signature at the end of the SSH key?
No, that part is ignored.
Do copy, to be sure, the public key as well as the private one.
Or, ideally, generate a new one dedicated to the second machine (since copying private keys is not the best practice)
ssh -Tv email@example.com show you the right private key is considered, check for a difference in environment variable (type set in a CMD). In particular, make sure you don't have
GIT_SSHset to Windows 10 openSSH.
where sshto make sure Git is using the same openSSH on both machines.
ssh -Tv firstname.lastname@example.org show you the right private key is not considered, check if on your first machine you have a
%USERPROFILE%\.ssh\config, which should then be replicated on the second one.
Trying to integrate a new TeamCity project with an existing git-bitbucket repo.
I am a rather limited user on our TeamCity platform (on-prem, 2017.1.3-46961). I do not have access to the actual server file system, I am using the web interface, instead.
Created an SSH key pair on my laptop with
ssh-keygen -t rsa -m PEM
This VCS Root is in the project where the SSH key has been uploaded. Should have I uploaded the key somewhere else?
Or, maybe, this is a TeamCity bug? I tried basic shake-up like hard-refreshing the page, logging out/in......
ANSWERAnswered 2021-Jun-12 at 13:39
Even though the VCS root was created in the specific project, it somehow
belongs to . Once I added the SSH key in the root project, it was available for selection in the dropdown above and connection test to bitbucket has passed.
I am reading about JWKS and found information about the key rotation concept - https://developer.okta.com/docs/concepts/key-rotation/
Let's assume I use JWKS in my application but I don't fetch them periodically, so just hardcoded. The single key JSON object looks like...
ANSWERAnswered 2021-Jun-11 at 21:32
JSON Web Key Set (JWKS aka JWK Set) is a list of JSON Web Keys (JWKs). Since JWK Set is simply a container, it contains no metadata such as an expiration date/time.
It does not expose this for at least two reasons:
- RFC 7517 is the specification that governs the behavior of JWKs and JWK Set. It does not mention or require the provider to publish an expiration date/time. Perhaps this is so due to reason #2:
- The provider should be able to remove keys for any reason at any time. Possible reason: key has been compromised. (For a private/public keypair, this would mean the private key has been compromised and the corresponding public key published via JWKS should be removed from circulation). This example is an outlier but it does happen and the provider would have to act immediately to fix it.
Emergencies notwithstanding, providers do rotate keys on a regular basis as a matter of good security hygiene. To handle key rotation (be it planned or emergency), your application should adhere to a simple algorithm. It should periodically fetch the keys from JWKS endpoint, build a local replica of all keys and add/remove keys from this replica based on the last fetch. Only keys found in the local replica should be used by your application to perform a cryptographic operation such as verifying a signature on a JWT.
Each JWK has a
kid (key id) parameter and this parameter is used to match a specific key. RFC 7517 recommends using
kid to choose among a set of keys within a JWK Set during key rollover. When your application does a fetch of keys from JWKS, you'll be comparing the set of keys coming from JWKs to the set of keys in your local replica. The comparison is based on
kid. If a key with some
kid is present in JWKS but not present in your local replica, you should add this key to your replica. Vice versa, if a key with some
kid is present in your local replica but not present in JWKS, you should remove this key from your local replica.
How frequently should your application fetch the keys from JWKS? This is up to you, it depends on the risk tolerance of your app and/or your organization. Some apps fetch every minute, others do it hourly or daily.
Let's say your app never does this fetch, the key is hardcoded in your app. This will work until the key is removed by the provider. (We're assuming that we're talking about a public key here. A JWK could represent a private key...and that you will not want to embed into your app). Some providers don't rotate keys or do so once in a very long while. If you're dealing with a well-known (to you) provider and they guarantee to you that they won't rotate keys, your risk of embedding a key into your app is low.
In general, embedding a public key into the app is not a good idea. If you're going to be using a JWKS endpoint, implement a simple fetch + update solution as outlined above.
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