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Google have recently announced that they are going to start reporting that SSL certificates that are signed with a SHA-1 Hash will be treated as having a lower security than those signed with newer, higher strength hashes such as SHA-256 or SHA-512.

1. Use Openssl To Generate Key Pair
2. Openssl Generate Rsa Key Pair

Google’s announcement can be found here at http://googleonlinesecurity.blogspot.co.uk/2014/09/gradually-sunsetting-sha-1.html

So here's my problem: I have 3 files. One is ciphertext.enc, which is a text encrypted using AES 256.The second one is key.cipher, which is ciphertext.enc's key.This key.cipher was encrypted using a public RSA key. The third file is pub.key, the public RSA key used to encrypt key.cipher.Is also known that openssl was used to perform these encryptions. Apr 12, 2020  Steps to create root and intermediate CA certificate and combine them to openssl create certificate chain. Openssl verify certificate chain (CA bundle). The root CA can revoke the intermediate certificate and create a new intermediate cryptographic pair. RsaEncryption RSA Public-Key: (4096 bit) Next openssl verify intermediate. Nov 06, 2019  As of 2003 RSA Security claims that 1024-bit RSA keys are equivalent in strength to 80-bit symmetric keys, 2048-bit RSA keys to 112-bit symmetric keys and 3072-bit RSA keys to 128-bit symmetric keys. RSA claims that. 2048-bit keys are sufficient until 2030. Ways to generate symmetric and asymmetric keys. Ask Question. Maybe a highly subjective and biased personal opinion of mine: I personally prefer to use my own software to generate RSA keys. To generate such a key, use OpenSSL as: openssl rand 16 myaes.key AES-256 expects a key of 256. AES-256 requires a 256-bit key, period. However there are different ways of building that 256-bit key. One way is to generate 256 random bits and take them as the key. You need to store these 256 bits somewhere, or you won't be able to decrypt what you've encrypted.

Technically at the moment there isn’t anything really wrong with the SHA-1 hash function, but it is now quite old and is starting to show potential cracks. Hence the reason that the security industry is advising to move to something better. In this case SHA-256.

1. Generate a SSL Key File

Firstly you will need to generate a key file. The example below will generate a 2048 bit key file with a SHA-256 signature.

Use Openssl To Generate Key Pair

If you want extra security you could increase the bit lengths.

** Please note that both these examples will not add a password to the key file. To do that you will need to add -aes256 to the command.

2. Create a Certificate Signing Request (CSR)

This step will create the actually request file that you will submit to the Certificate Authority (CA) of your choice.

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You can check that your Certificate Signing Request (CSR) has the correct signature by running the following.

It should display the following if the signature is correct.

3. Install the Certificate (CRT)

Openssl Generate Rsa Key Pair

This step is very dependant of the software you use and I won’t really cover. All I will say is that these certificates are supported by a multitude of software, including Apache HTTPD and NGINX.

4. Test your installed Certificate

This step is extremely important and will show you any security problems with your SSL configuration.

Qualys have a free hosted service that tests the SSL configuration of Internet facing web servers for SSL issues. The sites tested are rated from A to F, and a report is generated. This report is really useful for tuning your SSL configuration.

The SSL Labs tests are regularly updated when new issues are discovered. This means that if your server is rated as A today, next week it maybe rated as C.