| Subject | English | Hebrew |
| comp., MS | Challenge Handshake Authentication Protocol | פרוטוקול CHAP (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) |
| comp., MS | HIP challenge | דרוש HIP (A challenge meant to be easily solved by humans, while remaining too hard to be economically solved by computers) |
| comp., MS | payment instrument challenge | בדיקת אמצעי תשלום (A fraud prevention mechanism that attempts to verify that an individual using a payment instrument is authorized to use or is the owner of that instrument) |