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It appears they are both encryption algorithms that require public and private keys. Why would I pick one versus the other to provide encryption in my client server application? AVA Referring, https://web.archive.org/web/20140212143556/http://courses.cs.tamu.edu:80/pooch/665_spring2008/Australian-sec-2006/less19.html RSA RSA encryption and decryption are commutative hence it may be used directly as a digital signature scheme given an RSA scheme {(e,R), (d,p,q)} to sign a message M, compute: S = M power d (mod R) to verify a signature, compute: M = S power e(mod R) = M power e.d(mod R) = M(mod

Is one more secure than the other? Mike Pelley id_rsa.pub and id_dsa.pub are the public keys for id_rsa and id_dsa . If you are asking in relation to SSH , id_rsa is an RSA key and can be used with the SSH protocol 1 or 2, whereas id_dsa is a DSA key and can only be used with SSH protocol 2. Both are very secure, but DSA does seem to be the standard these days (assuming all your clients/servers support SSH 2). Update: Since this was written DSA has been shown to be insecure. More information available in the answer below. SSH uses public/private key pairs , so id_rsa is your RSA private key

How do you use an identity file with rsync? This is the syntax I think I should be using with rsync to use an identity file to connect: rsync -avz -e 'ssh -p1234 -i ~/.ssh/1234-identity' \ "/local/dir/" remoteUser@22.33.44.55:"/remote/dir/" But it's giving me an error: Warning: Identity file ~/.ssh/1234-identity not accessible: No such file or directory. The file is fine, permissions are set correctly, it works when doing ssh - just not with rsync - at least in my syntax. What am I doing wrong? Is it trying to look for the identity file on the remote machine? If so, how do I specify that I

I'm about to implement the DSA algorithm , but there is a problem: choose "p", a prime number with L bits, where 512 <= L <= 1024 and L is a multiple of 64 How can I implement a random generator of that number? Int64 has "only" 63 bits length. You can generate a random number with n bits using this code: var rng = new RNGCryptoServiceProvider(); byte[] bytes = new byte[n / 8]; rng.GetBytes(bytes); BigInteger p = new BigInteger(bytes); The result is, of course, random and not necessarily a prime. The BigInteger class was introduced in the .NET 4.0 Framework. For generating large prime numbers,

I was wondering if there was (and I hope there is) a standard for public key size for ECDH (Elliptic Curve Diffie-Hellman) and ECDSA (Elliptic Curve Digital Signature Algorithm) for every curve type over prime fields (192, 224, 256, 384 and 521). emboss If you use one of the "named curves" then the public key size is fixed and dependent on the "field size" of your underlying curve. Compressed vs. uncompressed representation Public key sizes further depend on whether the "uncompressed" representation or the "compressed" representation is used. In the uncompressed form, the public key size is

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