Learn Arabic (Modern Standard): بروتوكولات التشفير بمثابة قفل للبيانات. - Encryption protocols serve as a lock for the data.

The phrase بمثابة (serving as) functions grammatically as the first part of an idafa (possessive construction). Because of this, it forces the noun immediately following it, قفل, into the genitive case, making it قفلٍ (quflin).

What is the root and form of التشفير (encryption)?

It is the Form II verbal noun (masdar) from the root ش ف ر. Form II often indicates applying an intensive process to something. Here, it refers to the process of applying a cipher or code, hence encryption.

Since بروتوكولات (protocols) is plural, why is قفل (lock) singular?

When comparing a plural subject that acts as a single system or unit, Arabic often uses a singular noun for the comparison. Saying it serves as a single قفل (lock) conceptually groups the protocols together into one unified protective barrier, which sounds much more natural here.

Why does للبيانات (for the data) have two lams in a row, and where is the definite article?

This is a foundational spelling rule that is easy to forget: when the preposition لِـ (for/to) attaches to a noun with the definite article الـ (al-), the alif of the article is completely dropped in writing. Thus, لِـ plus البيانات merges into للبيانات (li-l-bayānāt).