| Character repertoire and coded character sets for the international teletex service | |
| Status | Withdrawn |
|---|---|
| Year started | 1980 |
| Latest version | (03/93) March 1993 |
| Organization | ITU-T |
| Committee | Study Group VIII |
| Related standards | T.51, ASN.1, X.500, X.509 |
| Domain | encoding |
| License | Freely available |
| Website | https://www.itu.int/rec/T-REC-T.61 |
T.61 is an ITU-T Recommendation for a Teletex character set. T.61 predated Unicode, and was the primary character set in ASN.1 used in early versions of X.500 and X.509 for encoding strings containing characters used in Western European languages.[1] It is also used by older versions of LDAP.[2] While T.61 continues to be supported in modern versions of X.500 and X.509, it has been deprecated in favor of Unicode. It is also called Code page 1036, CP1036, or IBM 01036.
While ASN.1 does see wide use and the T.61 character set is used on some standards using ASN.1 (for example in RSA Security's PKCS #9), the 1988-11 version of the T.61 standard itself was superseded by a never-published 1993-03 version; the 1993-03 version was withdrawn by the ITU-T.[3] The 1988-11 version is still available.[3]
T.61 was one of the encodings supported by Mozilla software in email and HTML until 2014, when the supported encodings were limited to those in the WHATWG Encoding Standard (although T.61 remained supported for LDAP).[4]