![]() Locate the two lines starting with “#-protocols” and “#-cipher-suites” A full list of Cipher Suites and Protocols can be found here: SSL Protocols and Cipher Suites can be easily configured by editing the server.properties file found in the application directory. Restart the PaperCut Application Server service.ĭisable specific ciphers and protocols- Version 16.2 (Build 37799) and above Locate the line starting with “-client-cipher-order”Ĭhange client to -client-cipher-order=N (cipher preference: server). Specifying server cipher order allows you to control the priority of ciphers that can be used by the SSL connections from the clients. You can, however, configure the SSL cipher order preference to be server cipher order. suites=TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384, TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384, TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256, TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256, TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256, TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256, TLS_DHE_RSA_WITH_AES_256_GCM_SHA384, TLS_DHE_RSA_WITH_AES_128_GCM_SHA256Ībove example can be further enhanced to remove all the _DHE_ values to use strictly Elliptic curve based cipher suites at the cost of reduced compatibility.Ĭonfigure the SSL cipher order preference- Version 17.1 and aboveīy default, the SSL cipher order preference is set to client cipher order. ![]() Example setting to configure strict / modern cipher settings: -strong-defaults=Y This disables legacy ciphers such as (RC4, 3DES), enables TLS1.3 support, increases Diffie Hellman key sizes by default and uses stronger elliptic curve families and enables unrestricted crypto policy (eg AES-256) in all TLS communications inbound to the server. Set the value after = sign to ‘Y’ so it looks like: -strong-defaults=Y and restart the server. Remove the proceeding # sign to uncomment the lines and edit the list as needed. Locate the line starting with “-strong-defaults” In a text editor, open the following file: /server/server.properties Check below to find the instructions specific to your version of PaperCut.Ĭonfigure best practice cipher and removing weak ciphers easily - Version 18.2 and above Most MFDs will support TLS v1.0 and newer protocols, but older devices may require SSL 3.0, and making some of the changes suggested below will block HTTPS connections from these devices.įurthermore, the process to configure these settings have been improved in recent versions. ![]() Be aware that reducing the available ciphers may limit support for older browsers or may prevent legacy MFDs from connecting to the PaperCut server, so please take care to test changes thoroughly. ![]() When a client connects to the server, the two communicate and pick the most secure cipher that the two mutually support. ![]() This question may arise in response to comply with policies such as PCI-DSS recommendations, to mitigate potential attacks such as the BEAST SSL vulnerability CVE-2011-3389), or in order to implement a security policy such as support for Perfect Forward Secrecy in TLS communications.īy default, PaperCut is configured to allow a variety of SSL ciphers with the aim of supporting the widest array of browsers and operating systems possible. This article is written for security or network specialists and a certain level of security expertise is assumed.Īn often asked question is how to manage SSL cipher lists used by the PaperCut application server. ![]()
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