The Computer Science department has a x.509 certificate authority which can be used to authenticate against the department's secure services, including imap and https.

You can download the CA public key here.

Certificate:
    Data:
        Version: 3 (0x2)
        Serial Number: 0 (0x0)
        Signature Algorithm: md5WithRSAEncryption
        Issuer: C=US, ST=New York, L=Troy, O=Computer Science - Rensselaer Polytechnic Institute, OU=CS Lab, CN=CS Lab/Email=labstaff@cs.rpi.edu
        Validity
            Not Before: Dec 11 22:31:17 2001 GMT
            Not After : Dec  6 22:31:17 2021 GMT
        Subject: C=US, ST=New York, L=Troy, O=Computer Science - Rensselaer Polytechnic Institute, OU=CS Lab, CN=CS Lab/Email=labstaff@cs.rpi.edu
         Subject Public Key Info:
            Public Key Algorithm: rsaEncryption
            RSA Public Key: (1024 bit)
                Modulus (1024 bit):
                    00:d6:36:a9:d1:41:20:d2:86:39:e7:93:ab:d3:37:
                    ca:e0:da:42:0a:c7:3b:fd:52:44:27:e7:d5:b5:d8:
                    1f:64:6a:72:eb:62:36:97:ff:85:28:dc:7a:b9:be:
                    ae:27:f8:c6:42:a0:fd:67:0a:ef:a3:9e:9a:0c:a5:
                    58:3b:0b:1e:4c:f2:8a:ef:ec:3c:39:ac:b8:bd:6a:
                    f9:cb:d6:a3:cd:18:05:02:15:44:35:5b:c0:a2:89:
                    de:28:f2:8c:cd:82:4e:5d:6f:05:94:88:ee:c2:02:
                    97:98:b4:20:5c:0a:0d:03:13:a8:8c:50:27:58:42:
                    99:8d:cd:e8:3e:7c:b5:23:97
                Exponent: 65537 (0x10001)
         X509v3 extensions:
            X509v3 Subject Key Identifier:
                44:A7:12:4E:AA:E0:A7:89:2C:C7:5F:69:5F:84:E9:13:24:8B:DA:EA
            X509v3 Authority Key Identifier:
                keyid:44:A7:12:4E:AA:E0:A7:89:2C:C7:5F:69:5F:84:E9:13:24:8B:DA:EA
                DirName:/C=US/ST=New York/L=Troy/O=Computer Science - Rensselaer Polytechnic Institute/OU=CS Lab/CN=CS Lab/Email=labstaff@cs.rpi.edu
                serial:00

            X509v3 Basic Constraints:
                CA:TRUE
     Signature Algorithm: md5WithRSAEncryption
        7e:fd:10:34:ac:9f:1d:b4:2a:08:c5:71:3c:ec:a9:dc:39:fe:
        0f:f4:22:44:58:02:e4:67:7f:48:51:0b:3e:f9:cd:c7:09:d8:
        57:48:bc:5c:a3:5c:f3:c9:d6:aa:3b:df:c4:3e:98:fd:0e:f3:
        42:41:fa:06:3f:6e:0a:e8:c8:e4:93:de:65:35:35:2f:de:2f:
        c3:4b:f2:cc:89:d4:32:41:f2:df:28:50:08:fb:c5:d8:31:c7:
        e2:4b:a9:71:55:9f:6c:ab:02:ef:94:3b:21:c2:72:b2:59:2a:
        24:9d:bb:72:86:bc:5e:f0:28:3c:22:66:cd:52:64:ac:54:fb:
        ab:f1