| Subject | German | English |
| comp., MS | Challenge Handshake Authentication-Protokoll | Challenge Handshake Authentication Protocol (A challenge-response authentication protocol for Point-to-Point Protocol (PPP) connections described in RFC 1994. It uses the industry-standard MD5 hashing algorithm to hash the combination of a challenge string issued by the authenticating server and the user's password in the response) |
| med., health., anim.husb. | Challenge-Virus | challenge virus |
| polit. | Übung Cooperative Challenge'95 | exercise Cooperative Challenge'95 |