ciphers — SSL cipher display and cipher list tool
openssl ciphers [-v] [-ssl2] [-ssl3] [-tls1] [cipherlist]
The cipherlist command converts OpenSSL cipher lists into
ordered SSL cipher preference lists. It can be used as a test tool
to determine the appropriate cipherlist.
verbose option. List ciphers with a complete description of
protocol version (SSLv2 or SSLv3; the latter includes TLS), key
exchange, authentication, encryption and mac algorithms used along
with any key size restrictions and whether the algorithm is classed
as an "export" cipher. Note that without the -v option, ciphers
may seem to appear twice in a cipher list; this is when similar
ciphers are available for SSL v2 and for SSL v3/TLS v1.
only include SSL v3 ciphers.
only include SSL v2 ciphers.
only include TLS v1 ciphers.
print a brief usage message.
a cipher list to convert to a cipher preference list. If it
is not included then the default cipher list will be used. The format
is described below.
CIPHER LIST FORMAT
The cipher list consists of one or more cipher strings separated by colons. Commas or spaces are also acceptable
separators but colons are normally used.
The actual cipher string can take several different forms.
It can consist of a single cipher suite such as RC4-SHA.
It can represent a list of cipher suites containing a certain
algorithm, or cipher suites of a certain type. For example SHA1
represents all ciphers suites using the digest algorithm SHA1 and
SSLv3 represents all SSL v3 algorithms.
Lists of cipher suites can be combined in a single cipher
string using the + character. This is used as a logical and operation.
For example SHA1+DES represents all cipher suites containing the
SHA1 and the DES algorithms.
Each cipher string can be optionally preceded by the characters
!, - or +.
If ! is used then the ciphers are permanently deleted from
the list. The ciphers deleted can never reappear in the list even
if they are explicitly stated.
If - is used then the ciphers are deleted from the list, but
some or all of the ciphers can be added again by later options.
If + is used then the ciphers are moved to the end of the
list. This option doesn't add any new ciphers it just moves matching
If none of these characters is present then the string is
just interpreted as a list of ciphers to be appended to the current
preference list. If the list includes any ciphers already present
they will be ignored: that is they will not moved to the end of
Additionally the cipher string @STRENGTH can be used at any
point to sort the current cipher list in order of encryption algorithm
The following is a list of all permitted cipher strings and
the default cipher list. This is determined at compile time
and is normally ALL:!ADH:RC4+RSA:+SSLv2:@STRENGTH.
This must be the first cipher string specified.
the ciphers included in ALL, but not enabled by default. Currently
this is ADH. Note that this rule does not cover eNULL, which is
not included by ALL (use COMPLEMENTOFALL if necessary).
all ciphers suites except the eNULL ciphers which must be
the cipher suites not enabled by ALL, currently being eNULL.
"high" encryption cipher suites. This currently means those
with key lengths larger than 128 bits.
"medium" encryption cipher suites, currently those using 128
"low" encryption cipher suites, currently those using 64 or
56 bit encryption algorithms but excluding export cipher suites.
export encryption algorithms. Including 40 and 56 bits algorithms.
40 bit export encryption algorithms
56 bit export encryption algorithms.
the "NULL" ciphers that is those offering no encryption. Because
these offer no encryption at all and are a security risk they are
disabled unless explicitly included.
the cipher suites offering no authentication. This is currently
the anonymous DH algorithms. These cipher suites are vulnerable
to a "man in the middle" attack and so their use is normally discouraged.
cipher suites using RSA key exchange.
cipher suites using ephemeral DH key agreement.
cipher suites using DH key agreement and DH certificates signed
by CAs with RSA and DSS keys respectively. Not implemented.
cipher suites using RSA authentication, i.e. the certificates
carry RSA keys.
cipher suites using DSS authentication, i.e. the certificates
carry DSS keys.
cipher suites effectively using DH authentication, i.e. the
certificates carry DH keys. Not implemented.
kFZA, aFZA, eFZA, FZA
ciphers suites using FORTEZZA key exchange, authentication,
encryption or all FORTEZZA algorithms. Not implemented.
TLSv1, SSLv3, SSLv2
TLS v1.0, SSL v3.0 or SSL v2.0 cipher suites respectively.
cipher suites using DH, including anonymous DH.
anonymous DH cipher suites.
cipher suites using AES.
cipher suites using triple DES.
cipher suites using DES (not triple DES).
cipher suites using RC4.
cipher suites using RC2.
cipher suites using IDEA.
cipher suites using MD5.
cipher suites using SHA1.
The non-ephemeral DH modes are currently unimplemented in
OpenSSL because there is no support for DH certificates.
Some compiled versions of OpenSSL may not include all the
ciphers listed here because some ciphers were excluded at compile
Verbose listing of all OpenSSL ciphers including NULL ciphers:
openssl ciphers -v 'ALL:eNULL'
Include all ciphers except NULL and anonymous DH then sort
openssl ciphers -v 'ALL:!ADH:@STRENGTH'
Include only 3DES ciphers and then place RSA ciphers last:
openssl ciphers -v '3DES:+RSA'
Include all RC4 ciphers but leave out those without authentication:
openssl ciphers -v 'RC4:!COMPLEMENTOFDEFAULT'
Include all chiphers with RSA authentication but leave out
ciphers without encryption.
openssl ciphers -v 'RSA:!COMPLEMENTOFALL'
s_client(1), s_server(1), ssl(3)
The COMPLENTOFALL and COMPLEMENTOFDEFAULT selection options
were added in version 0.9.7.