crosssign

Crosssign, sometimes written cross-sign, is a term used in several disciplines to describe different concepts that are not closely related and do not have a single universal definition. In religious contexts, the phrase often refers to the sign of the cross, a gesture used by many Christian denominations during prayer and liturgy. In information security and digital certificates, cross-signing denotes a technique for establishing trust between otherwise separate certificate authorities by allowing one CA to sign certificates issued by another, creating a bridge between PKIs. The term also appears as a brand name or in fictional contexts, where its meaning varies with usage.

Sign of the cross: The gesture is typically performed by tracing a cross on the body with the right hand, usually touching the forehead, chest, and both shoulders in sequence. The precise sequence and interpretation vary by tradition: Roman Catholics and many Anglicans commonly begin at the forehead, then the chest, then the left shoulder, followed by the right shoulder; Orthodox practice may differ in emphasis and order. The practice is associated with blessing, invocation of the Trinity, and personal devotion.

Cross-signing in PKI: In computing, cross-signing is the process by which a certificate authority signs certificates issued by another CA. This creates a cross-trust relationship between PKI hierarchies and can facilitate interoperability, software distribution, or transitions between root certificates. Managing cross-signing requires careful control of trust relationships to prevent unintended trust chains or root compromise.

Other uses: The term also appears in branding, marketing, and fictional works where it may serve as a product name or symbolic motif. Etymologically, crosssign combines “cross” and “sign,” reflecting the common element of marking or signaling with a cross-shaped form.