+A5/1 is a stream cipher, once central to securing mobile communications. Primarily used in [GSM](/wiki/gsm) networks, it encrypts voice and data traffic, forming a foundational element of early digital [Cryptography](/wiki/cryptography).
+## See also
+- [Cipher](/wiki/cipher)
+- [Encryption](/wiki/encryption)
+- [Security](/wiki/security)
... 1 more lines