Using System.Security.Cryptography.Aes to generate encryption key

Is the below method a safe way of generating a random encryption key to be used with AES (SymmetricAlgorithm) in .NET?

It essentially piggybacks off of the Aes alg to create a random key, trimmed to the correct bit size.

    /// <summary>     /// Defines AES key sizes.     /// </summary>     public enum KeySize     {         /// <summary>         /// Key size of 128 bits.         /// </summary>         Aes128 = 128,          /// <summary>         /// Ket size of 192 bits.         /// </summary>         Aes192 = 192,          /// <summary>         /// Key size of 256 bits.         /// </summary>         Aes256 = 256     }      /// <summary>     /// Generates an AES key.     /// </summary>     /// <param name="size">Specifies the desired key size.</param>     /// <returns>AES key.</returns>     public static string GenerateEncryptionKey(KeySize size)     {         using (var aes = Aes.Create())         {             int keySize = (int)size;              if (aes.ValidKeySize(keySize))             {                 aes.KeySize = keySize;                 aes.GenerateKey();                  return BitConverter.ToString(aes.Key)                     .Replace("-", string.Empty)                     .Substring(0, keySize / 8);             }             else             {                 return null;             }         }     } 

Certbot Can’t Generate SSL Certificates Due to Callange Falure?

I’ve run sudo certbot --apache -d scilabnet.asuscomm.com but I get the error when trying to set up SSL certificates on my apache2 server:

sarah@scilab_comp_0:~$   sudo certbot --apache -d scilabnet.asuscomm.com Saving debug log to /var/log/letsencrypt/letsencrypt.log Plugins selected: Authenticator apache, Installer apache Obtaining a new certificate Performing the following challenges: http-01 challenge for scilabnet.asuscomm.com Waiting for verification... Cleaning up challenges Failed authorization procedure. scilabnet.asuscomm.com (http-01): urn:ietf:params:acme:error:connection :: The server could not connect to the client to verify the domain :: Fetching http://scilabnet.asuscomm.com/.well-known/acme-challenge/6Tj8Rc9c6D_aZ_lqPdtXXKqfdubVAWn8Gapl5ZA6-jc: Timeout during connect (likely firewall problem)  IMPORTANT NOTES:  - The following errors were reported by the server:     Domain: scilabnet.asuscomm.com    Type:   connection    Detail: Fetching    http://scilabnet.asuscomm.com/.well-known/acme-challenge/6Tj8Rc9c6D_aZ_lqPdtXXKqfdubVAWn8Gapl5ZA6-jc:    Timeout during connect (likely firewall problem)     To fix these errors, please make sure that your domain name was    entered correctly and the DNS A/AAAA record(s) for that domain    contain(s) the right IP address. Additionally, please check that    your computer has a publicly routable IP address and that no    firewalls are preventing the server from communicating with the    client. If you're using the webroot plugin, you should also verify    that you are serving files from the webroot path you provided. 

I’m following: https://www.digitalocean.com/community/tutorials/how-to-secure-apache-with-let-s-encrypt-on-ubuntu-16-04

Not sure what I’m doing wrong. UFW isn’t enabled.

How can I get SSL certificates working on my apache2 server?

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How to generate an output address from output scrips which start with 0x00?

A few days ago, I got a BITCOIN traffic which contains some tx message. some of tx messages contain witness data. I want to produce all output addresses from transaction output scripts. I extracted some of them, but in some cases, generated output address however seems to be valid, but I can’t track them in some sites like

https://www.blockchain.com

as an example, in tx output script which is showed below, how I can extract True address?

00142f82e61a98eb7027672760c691784d5fbccf7ce3 

it seems a script which has op_code = 0x00 and push data length = 0x14.

How to generate an output address from output scrips which start with 0x00?

A few days ago, I got a BITCOIN traffic which contains some tx message. some of tx messages contain witness data. I want to produce all output addresses from transaction output scripts. I extracted some of them, but in some cases, generated output address however seems to be valid, but I can’t track them in some sites like

https://www.blockchain.com

as an example, in tx output script which is showed below, how I can extract True address?

00142f82e61a98eb7027672760c691784d5fbccf7ce3 

it seems a script which has op_code = 0x00 and push data length = 0x14.