search for: arcfour256

...fig and /etc/ssh/ssh_config. Is just using these three ciphers like to cause me any problems? Could having so few ciphers be creating a security concern itself? Thanks The following weak client-to-server encryption algorithms are supported by the remote service: rijndael-cbc at lysator.liu.se arcfour256 arcfour128 aes256-cbc 3des-cbc aes192-cbc blowfish-cbc cast128-cbc arcfour aes128-cbc The following weak server-to-client encryption algorithms are supported by the remote service: rijndael-cbc at lysator.liu.se arcfour256 arcfour128 aes256-cbc 3des-cbc aes192-cbc blowfish-cbc cast128-cbc arcfour...

...mprovement is a change from Markus Friedl to reuse the MAC context, rather than reinitialising it for every packet. This saves two calls to the underlying hash function (e.g. SHA1) for each packet. My tests found that this yielded at 12-16% speedup for bulk transfers to localhost using HMAC-MD5 and arcfour256. HMAC-SHA1 should see an even bigger improvement, because SHA1 is a more expensive hash function. The second improvement is Peter Valchev's addition of a new MAC: Ted Krovetz' UMAC-64[1]. This MAC uses a very different approach than the HMACs that OpenSSH currently supports, and it comes w...

...eparated. The supported ciphers are ''3des-cbc'', ''aes128-cbc'', ''aes192-cbc'', ''aes256-cbc'', ''aes128-ctr'', ''aes192-ctr'', ''aes256-ctr'', ''arcfour128'', ''arcfour256'', ''arcfour'', ''blowfish-cbc'', and ''cast128-cbc''. The default is: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128, aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc, aes256-cbc,arcfour

Hello All, As the release notes of SSH-4.7 version says that a new MAC algorithm (UMAC-64 - RFC4418) was introduced with OpenSSH-4.7 which gives much better performance, I was tempted to check out the enhanced speed provided with new version. So I downloaded OpenSSH-5.1p1 and build it on Solaris 10 with Sun Compiler CC. My test setup:- 1. Two Sunfire 440 with 2 CPU (1281 MHz) and 4GB RAM. 2.

...SSH2_MSG_KEXINIT sent debug1: SSH2_MSG_KEXINIT received debug2: kex_parse_kexinit: diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1 debug2: kex_parse_kexinit: ssh-rsa,ssh-dss debug2: kex_parse_kexinit: aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour128,arcfour256,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc at lysator.liu.se,aes12 8-ctr,aes192-ctr,aes256-ctr debug2: kex_parse_kexinit: aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour128,arcfour256,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc at lysator.liu.se,aes12 8-ctr,aes192-ctr,aes256-ctr debug2: kex_par...

...SSH2_MSG_KEXINIT sent debug1: SSH2_MSG_KEXINIT received debug2: kex_parse_kexinit: diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1 debug2: kex_parse_kexinit: ssh-rsa,ssh-dss debug2: kex_parse_kexinit: aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour128,arcfour256,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc at lysator.liu.se ,aes128-ctr,aes192-ctr,aes256-ctr debug2: kex_parse_kexinit: aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour128,arcfour256,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc at lysator.liu.se ,aes128-ctr,aes192-ctr,aes256-ctr debug2: kex_par...

...onnection retries (e.g. 256) is sufficient to render the attack infeasible for this case. AES CTR mode and arcfour ciphers are not vulnerable to this attack at all. These may be preferentially selected by placing the following directive in sshd_config and ssh_config: Ciphers aes128-ctr,aes256-ctr,arcfour256,arcfour,aes128-cbc,aes256-cbc A future version of OpenSSH may make CTR mode ciphers the default and/or implement other countermeasures, but at present we do not feel that this issue is serious enough to make an emergency release. -d [1] http://www.cpni.gov.uk/Docs/Vulnerability_Advisory_SSH.txt...

http://bugzilla.mindrot.org/show_bug.cgi?id=1291 Summary: aes256-ctr, aes192-ctr, arcfour256 broken with OpenSSL 0.9.8e Product: Portable OpenSSH Version: 4.5p1 Platform: All OS/Version: All Status: NEW Severity: minor Priority: P2 Component: sshd AssignedTo: bitbucket at mindrot.or...

https://bugzilla.mindrot.org/show_bug.cgi?id=2008 Bug #: 2008 Summary: IPV6 Bind to port 22 failed Classification: Unclassified Product: Portable OpenSSH Version: 5.9p1 Platform: ix86 OS/Version: Linux Status: NEW Severity: critical Priority: P2 Component: sshd AssignedTo:

...SG_KEXINIT received debug2: kex_parse_kexinit: diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1 debug2: kex_parse_kexinit: ssh-rsa,ssh-dss debug2: kex_parse_kexinit: aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour128,arcfour256,arcfour,aes192-cbc,aes256-cbc, rijndael-cbc at lysator.liu.se,aes128-ctr,aes192-ctr,aes256-ctr debug2: kex_parse_kexinit: aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour128,arcfour256,arcfour,aes192-cbc,aes256-cbc, rijndael-cbc at lysator.liu.se,aes128-ctr,aes192-ctr,aes256-ctr debug2: kex_par...

Attached is the very verbose ssh output. Just to be perverse, this time two nodes lost connectivity. The only thing I see is lines saying that the two connections are lost, although being honest I have no idea what everything else means. For reference, 8 ssh cinnections were being made at the same time for a 8x8mpi task. N.B., since the OS I am using does not have rsh, I am currently using the

...sh-rsa-cert-v01 at openssh.com,ssh-dss-cert-v01 at openssh.com,ssh-rsa-cert-v00 at openssh.com,ssh-dss-cert-v00 at openssh.com,ssh-ed25519,ssh-rsa,ssh-dss debug2: kex_parse_kexinit: chacha20-poly1305 at openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm at openssh.com,aes256-gcm at openssh.com,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc at lysator.liu.se debug2: kex_parse_kexinit: chacha20-poly1305 at openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm at openssh.com,aes256-gcm at openssh.com,arcfour256,arcfour128,aes128-cbc,3des...

...exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1 debug2: kex_parse_kexinit: ssh-rsa-cert-v01 at openssh.com,ssh-dss-cert-v01 at openssh.com,ssh-rsa-cert-v00 at openssh.com,ssh-dss-cert-v00 at openssh.com,ssh-rsa,ssh-dss debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc at lysator.liu.se debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc at lysator.l...

...ssh-rsa-cert-v00 at openssh.com,ssh-dss-cert-v00 at openssh.com ,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,ssh-ed25519,ssh-rsa,ssh-dss debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr, aes128-gcm at openssh.com,aes256-gcm at openssh.com,chacha20-poly1305 at openssh.com ,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour, rijndael-cbc at lysator.liu.se debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr, aes128-gcm at openssh.com,aes256-gcm at openssh.com,chacha20-poly1305 at openssh.com ,arcfour256,arcfour128,aes128-cbc,3...

...> h-dss-cert-v01 at openssh.com,ssh-rsa-cert-v00 at openssh.com,ssh- > dss-cert-v00 at openssh.com,ssh-ed25519,ssh-rsa,ssh-dss > debug2: kex_parse_kexinit: > chacha20-poly1305 at openssh.com,aes128-ctr,aes192-ctr,aes256-ctr, > aes128-gcm at openssh.com,aes256-gcm at openssh.com, > arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc, > cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc at lysator.liu.se > debug2: kex_parse_kexinit: > chacha20-poly1305 at openssh.com,aes128-ctr,aes192-ctr,aes256-ctr, > aes128-gcm at openssh.com,aes256-gcm at openssh.com, > arcfour25...

...T sent debug1: SSH2_MSG_KEXINIT received debug2: kex_parse_kexinit: diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1 debug2: kex_parse_kexinit: ssh-rsa,ssh-dss debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc at lysator.liu.se debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc at lysator....

...ha256 at libssh.org ,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1 debug2: kex_parse_kexinit: ssh-rsa debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128, aes128-gcm at openssh.com,aes256-gcm at openssh.com,chacha20-poly1305 at openssh.com ,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour, rijndael-cbc at lysator.liu.se debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128, aes128-gcm...

..._KEXINIT received debug2: kex_parse_kexinit: diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1 debug2: kex_parse_kexinit: ssh-rsa,ssh-dss debug2: kex_parse_kexinit: aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour128,arcfour256,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc at lysator.liu.se,aes128-ctr,aes192-ctr,aes256-ctr debug2: kex_parse_kexinit: aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour128,arcfour256,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc at lysator.liu.se,aes128-ctr,aes192-ctr,aes256-ctr debug2: kex_pars...

...INIT received debug2: kex_parse_kexinit: diffie-hellman-group-exchange-sha256,diffie- hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman- group1-sha1 debug2: kex_parse_kexinit: ssh-rsa,ssh-dss debug2: kex_parse_kexinit: aes128-cbc,3des-cbc,blowfish-cbc,cast128- cbc,arcfour128,arcfour256,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc at lysator.liu.se ,aes128-ctr,aes192-ctr,aes256-ctr debug2: kex_parse_kexinit: aes128-cbc,3des-cbc,blowfish-cbc,cast128- cbc,arcfour128,arcfour256,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc at lysator.liu.se ,aes128-ctr,aes192-ctr,aes256-ctr debug2: kex...

...sh-ed25519,ssh-rsa-cert-v01 at openssh.com,ssh-dss-cert-v01 at openssh.com,ssh-rsa-cert-v00 at openssh.com,ssh-dss-cert-v00 at openssh.com,ssh-rsa,ssh-dss debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm at openssh.com,aes256-gcm at openssh.com,chacha20-poly1305 at openssh.com,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc at lysator.liu.se debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm at openssh.com,aes256-gcm at openssh.com,chacha20-poly1305 at openssh.com,arcfour256,arcfour128,aes128-cbc,3des...