It's not.
Decoding encrypted enemy radio messages
answer
Encrypted messages are sent to prevent someone other than the intended recipient from reading your messages. Normally email can be read by anyone who can intercept your message (which is quite easy) with even a small amount of technological knowledge. Encrypting your messages prevents this and keeps your messages private.
The first proper computers were used to help the Allies decode German encrypted messages during World War II.
2G technology digitally encrypted phone conversations, allowed for greater mobile phone penetration levels, and introduced data serves for mobile. Services include text messaging, picture messages, and multi media messages (MMS). Any text message over 2G was digitally encrypted so only the intended receiver could receive and read it.
Voicemail, email messages, instant messages, data on handheld devices
When you reference a "public key" you are implying that the file has been encrypted using "asymmetric cryptography". In asymmetric cryptography, encryption and decryption depend on a key PAIR. The user retains their private key and publishes their public key. Anyone can encrypt a file using the user's public key and send it to them. The only person who should be able to decrypt a file encrypted with that public key is the holder of the private key - which, unless the user has made the mistake of sharing their private key - means that only the original user can decrypt the messages sent to them. Most of the asymmetric encryption algorithms use pretty much the same method to decrypt that was used to encrypt, but use the "other" key from the key pair. Messages encrypted using the private key can only be decrypted using the public key - which provides some authentication that the message indeed came from the holder of the private key. Messages encrypted using the public key can only be decrypted by the holder of the private key, so messages sent to them should be secure.
The most common and efficient way someone can find some good examples of condolence messages is searching the internet for them. They can also see if any local residents have any condolence messages.
The non-encrypted file will open faster, as the encrypted one needs to be decrypted first.
Paging is site-to-site encrypted digital messages - a much quicker method of communication than using mobile phones or 2-way radios.
Voicemail, Instant messages, Email messages, and Data on handheld devices