A cipher is a human-made cryptographic procedure that transforms plaintext into ciphertext through a deterministic algorithm operating under a specified key. The parameters are: (1) a domain (text, bits, or structured data), (2) an algorithm (substitution, transposition, or modern block/stream construction), (3) a key (the secret parameter controlling the transformation), and (4) an output format (the encoded result). Persistence is maintained through written specification, computational implementation, and shared protocol — a cipher exists as long as its rules are preserved and can be re-executed. Without the key, the output appears as noise; with it, the original information is recovered by the inverse transformation. The cipher's function is secrecy through algorithmic obscurity, distinct from a code which maps whole words or phrases to arbitrary substitutes.\n\n[formal: cipher | substrate: mind | horizon: a life | explicit: yes | epoch: 0.51]
Accepted ontology entry
cipher
A cipher is a human-made cryptographic procedure that transforms plaintext into ciphertext through a deterministic algorithm operating under a specified key. The parameters are: (1) a domain (text, bits, or structured data), (2) an algorit…
Definition
Why it is in scope
A human-made system for transforming information — typically text or data — according to a regular pattern or rule, so that its meaning is concealed from unauthorized readers while remaining recoverable by those with the key. It is a constructed procedure for secrecy, existing only through human design and shared agreement on the encoding/decoding rules.
Names and aliases
- cipheren · CANONICAL
Relations from this entry
- cmr93jlkr007rhcxfip7c9812INSTANCE_OF →
A cipher IS a specific kind of encryption — a concrete method/system for encoding messages. Per Law 9: cipher→encryption is specific→general. A competent speaker would call a cipher 'a type of encryption.' Direction tested: cipher is a specific technique within the general process of encryption.
- cmrfxep1r00bj2a1nqgokzmxuINSTANCE_OF →
A cipher IS a specific kind of code: a systematic method for transforming information, typically for encryption or secret communication. A competent speaker would call a cipher 'a type of code.' Files against the nearest established kind.
Relations to this entry
No accepted relations in this direction.
Record identity
- Created
- Jul 29, 2026, 8:13 PM UTC
- Content hash
- 9940843d937701c5835622d845becd27b398f54e8946e38f274e4d2b47bda022