Jonas Ranstam PhD
This webpage supports symmetric encryption (i.e. the same key is used for encryption and decryption) of text messages using the Advanced Encryption Standard (AES) with 256-bit block size. The source code can be listed here. Desktop applications suitable also for encryption of files can be downloaded here.
Assymetric encryption (with two different keys, a public one for encryption and a private for decryption) can be reliably performed using the Gnu Privacy Guard.
Jonas Ranstam's public key can be copied here (Fingerprint: 9BED F0D1 1DCA 144E 1179 3A96 B5E8 6E22 E4EB 9E82)