Encryption/decryption method, method for safe data transfer across a network, computer program products and computer readable media

摘要

An encryption/decryption method is disclosed. The method comprises: using at least one public encryption algorithm for encrypting/decrypting data by using an encryption key, and using a digital certificate for obtaining the encryption key, being the digital certificate one intended for a purpose of guaranteeing a user's identity, with at least one field including a safe combination of bytes predetermined for containing a guarantee key intended for the purpose of guaranteeing the user's identity. The method also comprises a) selecting, according to at least one predetermined steganographic criterion, a subset of the bits of the field with the guarantee key and/or of at least another field of at least the digital certificate also including a safe combination of bytes but not containing the guarantee key, and b) generating from at least the selected bits the encryption key.